Re: San Francisco Clojure Users
David, Yes. I am in Nigeria. Emeka On Tue, May 24, 2011 at 9:43 AM, David Jagoe wrote: > Are you in Nigeria? > > Anyone else on this list in Africa? > > > > On Sunday, 22 May 2011, Emeka wrote: > > Okay. > > I live in Africa... maybe we should have online meetups for now. > > Emeka > > > > On Thu, May 19, 2011 at 4:29 PM, David Jagoe > wrote: > > On 18 May 2011 18:54, Emeka wrote: > >> David, > >> How is Clojure doing in Africa? > > > > There really aren't that many people using it among the people that I > > have spoken to. I've worked in the UK, Europe and the US and in > > comparison South Africa is a little bit behind and quite conservative > > when it comes to technology choices. > > > > > > Cheers, > > David > > > > -- > > You received this message because you are subscribed to the Google > > Groups "Clojure" group. > > To post to this group, send email to clojure@googlegroups.com > > Note that posts from new members are moderated - please be patient with > your first post. > > To unsubscribe from this group, send email to > > clojure+unsubscr...@googlegroups.com > > For more options, visit this group at > > http://groups.google.com/group/clojure?hl=en > > > > -- > > Satajanus Nig. Ltd > > > > > > > > > > > > > > > > -- > > You received this message because you are subscribed to the Google > > Groups "Clojure" group. > > To post to this group, send email to clojure@googlegroups.com > > Note that posts from new members are moderated - please be patient with > your first post. > > To unsubscribe from this group, send email to > > clojure+unsubscr...@googlegroups.com > > For more options, visit this group at > > http://groups.google.com/group/clojure?hl=en > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to clojure@googlegroups.com > Note that posts from new members are moderated - please be patient with > your first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en > -- *Satajanus Nig. Ltd * -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: San Francisco Clojure Users
Okay. I live in Africa... maybe we should have online meetups for now. Emeka On Thu, May 19, 2011 at 4:29 PM, David Jagoe wrote: > On 18 May 2011 18:54, Emeka wrote: > > David, > > How is Clojure doing in Africa? > > There really aren't that many people using it among the people that I > have spoken to. I've worked in the UK, Europe and the US and in > comparison South Africa is a little bit behind and quite conservative > when it comes to technology choices. > > > Cheers, > David > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to clojure@googlegroups.com > Note that posts from new members are moderated - please be patient with > your first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en > -- *Satajanus Nig. Ltd * -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: San Francisco Clojure Users
David, How is Clojure doing in Africa? Emeka. On Wed, May 11, 2011 at 12:42 AM, David Jagoe wrote: > On 10 May 2011 15:00, Zach Tellman wrote: > > Unfortunately, you just missed the monthly Bay Area user group meetup, > > Yeah I saw that... gutted! > > > which was yesterday. But with Google I/O going on, maybe there are > > enough people around that an impromptu meetup would be plausible. > > That would be great. There aren't too many Clojure developers in South > Africa!! > > > > > Zach > > > > On May 10, 1:07 pm, David Jagoe wrote: > >> G'day everyone, > >> > >> Forgive me if this is not the appropriate place for this message, but > >> I'm in San Francisco for a few days from Johannesburg, South Africa. > >> Any clojure users keen on meeting up? Any clojure events going on that > >> I haven't spotted on-line? > >> > >> I run a business using Clojure for web development. > >> > >> Cheers, > >> David > > > > -- > > You received this message because you are subscribed to the Google > > Groups "Clojure" group. > > To post to this group, send email to clojure@googlegroups.com > > Note that posts from new members are moderated - please be patient with > your first post. > > To unsubscribe from this group, send email to > > clojure+unsubscr...@googlegroups.com > > For more options, visit this group at > > http://groups.google.com/group/clojure?hl=en > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to clojure@googlegroups.com > Note that posts from new members are moderated - please be patient with > your first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en > -- *Satajanus Nig. Ltd * -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: into map with vectors versus lists (Re: Creating map from string)
Did you try this
(apply hash-map (partition 2 (split (slurp "data") #",")))
On Sat, Dec 4, 2010 at 11:12 AM, Remco van 't Veer wrote:
> I expected this to work:
>
> (into {} (partition 2 (split (slurp "data") #",")))
>
> But unfortunately, `into' doesn't seem to allow pushing lists of pairs
> into a map. But vectors are allowed:
>
> (into {} (map vec (partition 2 (split (slurp "data") #","
>
> Can somebody explain why vectors are allowed and lists not?
>
>
> On 2010/12/03 15:40, Laurent PETIT wrote:
>
> > Hi,
> >
> > 2010/12/3 Anclj
> >
> > Hi,
> >
> > I have a string of data and I would like to get a map {:key
> > value, :key value, …}
> >
> > How could I do that?
> >
> > I've got:
> >
> > user> (split (slurp "data") #",")
> > ["0" "2" "1" "5" "2" "8" "3" "15" "4" "9"]
> >
> > And I would like:
> > {:0 2, :1 5, :2 8, :3 15, :4 9}
> >
> > Any idea?
> >
> > (let [s (split (slurp "data") #",")]
> > (zipmap (take-nth 2 s) (take-nth 2 (rest s
> >
> > HTH,
> >
> > --
> > Laurent
> >
> > --
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Re: Looking for a better way
Laurent and Robert, Thank you all. On Thu, Dec 16, 2010 at 9:44 AM, Laurent PETIT wrote: > Indeed ! > > I was stuck in the macro thinking, thanks for getting us out of it ! > > And then this solution not only works for literal strings: > > user=> (foo (str "yo" "man")) > #'user/yoman > user=> yoman > "yoman" > user=> > > 2010/12/16 Robert McIntyre > > no need to use macros at all: >> >> (defn foo >> "creates a symbol named s with the value s in the current namespace " >> [s] >> (intern *ns* (symbol s) s)) >> >> that is, assuming I got the use case right. >> >> --Robert McIntyre >> >> >> On Wed, Dec 15, 2010 at 8:00 AM, Laurent PETIT >> wrote: >> > 2010/12/15 Emeka >> >> >> >> Helllo All, >> >> Is there a better way of doing this? >> >> (defmacro foo [string] (let[b# string f# (symbol b#)] `(def ~f# ~b#))) >> > >> > Hello, >> > >> > What is it supposed to be used ? >> > >> > What do you expect the macroexpansion to look like ? >> > >> > As is stands, your example can go without the ending #'s since they >> aren't >> > declared inside the returned quoted expr. They're useless. >> > >> > So having >> > >> > (defmacro foo [string] (let [b string f (symbol string)] `(def ~f ~b))) >> > >> > But now, string is not (as you may think) evaluated within the let in >> the >> > macro. string is just an immutable datastructure containing "as is" what >> has >> > been passed to foo. So if what you pass to foo is something which >> > "evaluates" to a string, for example a string concatenation expression >> as >> > (str "the-" "value"), then the code will not do what it suggests it's >> doing >> > : >> > >> > user=> (defmacro foo [string] (let[b# string f# (symbol b#)] `(def ~f# >> > ~b#))) >> > #'user/foo >> > user=> (foo (str "the-" "value")) >> > java.lang.ClassCastException: clojure.lang.PersistentList cannot be cast >> to >> > java.lang.String (NO_SOURCE_FILE:0) >> > user=> (macroexpand '(foo (str "the-" "value"))) >> > java.lang.ClassCastException: clojure.lang.PersistentList cannot be cast >> to >> > java.lang.String (NO_SOURCE_FILE:0) >> > user=> >> > >> > >> > Now, if you just want the macro to take literal strings as input, then >> the >> > code can be further simplified to : >> > >> > (defmacro foo [string] `(def ~(symbol string) ~string)) >> > >> > user=> (defmacro foo [string] `(def ~(symbol string) ~string)) >> > #'user/foo >> > user=> (foo "the-string") >> > #'user/the-string >> > user=> the-string >> > "the-string" >> > user=> (macroexpand '(foo "the-string")) >> > (def the-string "the-string") >> > user=> >> > >> > HTH, >> > >> > -- >> > Laurent >> > >> > -- >> > You received this message because you are subscribed to the Google >> > Groups "Clojure" group. >> > To post to this group, send email to clojure@googlegroups.com >> > Note that posts from new members are moderated - please be patient with >> your >> > first post. >> > To unsubscribe from this group, send email to >> > clojure+unsubscr...@googlegroups.com >> > For more options, visit this group at >> > http://groups.google.com/group/clojure?hl=en >> >> -- >> You received this message because you are subscribed to the Google >> Groups "Clojure" group. >> To post to this group, send email to clojure@googlegroups.com >> Note that posts from new members are moderated - please be patient with >> your first post. >> To unsubscribe from this group, send email to >> clojure+unsubscr...@googlegroups.com >> For more options, visit this group at >> http://groups.google.com/group/clojure?hl=en >> > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to clojure@googlegroups.com > Note that posts from new members are moderated - please be patient with > your first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en > -- *Satajanus Nig. Ltd * -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Looking for a better way
*Helllo All,* * * *Is there a better way of doing this?* * * *(defmacro foo [string] (let[b# string f# (symbol b#)] `(def ~f# ~b#)))* * * * * *Regards,* *Emeka * -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: sql utilities
Beautiful . Emeka On Fri, Oct 15, 2010 at 1:08 AM, Stuart Campbell wrote: > Thanks Kyle. Looks useful! > > > On 15 October 2010 09:25, Saul Hazledine wrote: > >> On Oct 14, 9:16 pm, "Kyle R. Burton" wrote: >> > I've written some sql helper functions that will do things like list >> > the objects in the database and describe a table. I've found these >> > handy when doing interactive development as I don't have to jump over >> > to another app to see what the make up of tables are. I've also used >> > it in some scenarios when generating code from the database schema. >> > >> >> Very cool. If you have no joy getting it into contrib you can have >> write access to clj-sql if you want it: >> >> http://github.com/alienscience/clj-sql >> >> Otherwise, as Shanatu says, a github project of your own would be >> welcome and is sure to be used by others. >> >> Saul >> >> -- >> You received this message because you are subscribed to the Google >> Groups "Clojure" group. >> To post to this group, send email to clojure@googlegroups.com >> Note that posts from new members are moderated - please be patient with >> your first post. >> To unsubscribe from this group, send email to >> clojure+unsubscr...@googlegroups.com >> For more options, visit this group at >> http://groups.google.com/group/clojure?hl=en >> > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to clojure@googlegroups.com > Note that posts from new members are moderated - please be patient with > your first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en > -- *Satajanus Nig. Ltd * -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Displaying source of function typed into the REPL?
Sean, Try this, http://gist.github.com/193550 . Adjust it to your taste. Regards, Emeka On Mon, Sep 20, 2010 at 4:00 AM, Sean Corfield wrote: > That also sounds pretty useful for development. I may try that as an > exercise... > > This weekend has been a journey through The Joy of Clojure. I read > about 100 pages on Friday evening (easy going), 150 pages on Saturday > (harder going - more complex topics). Today I read another 50 pages, > skipped chapters 11 & 12 (brain too full to process - about 80 pages) > and read chapter 13 (about 20 pages). All the time I had a REPL open > and kept copy'n'pasting examples in and playing with them to get a > feel for it. It's been a really fun weekend! Now, unfortunately, I > must get chores (and work!) done before the week starts. > > See some of you at the JavaOne Clojure meetup tomorrow (Monday)? > > On Sun, Sep 19, 2010 at 6:11 PM, jlk wrote: > > Not sure how practical it is, but a while back I was playing around > > with a macro redefining defn so that it stored the function source in > > the meta-data of the function. I can't find it now but remember it > > being fairly trivial to implement. > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to clojure@googlegroups.com > Note that posts from new members are moderated - please be patient with > your first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en > -- *Satajanus Nig. Ltd * -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: JavaFX and Clojure
Mark, Can JavaFX do that? Regards, Emeka On Mon, Aug 23, 2010 at 7:12 PM, Mark Engelberg wrote: > > Rather than > > creating the JavaFX language they would have done so much more for the > > community to just focus on this scenegraph library, animation, etc... > > I agree. I'm not interested in the JavaFX language, but am interested > in doing Flash-like user interfaces and animations from Clojure. > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to clojure@googlegroups.com > Note that posts from new members are moderated - please be patient with > your first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en > -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Windows distribution for Leiningen 1.3.0
Wow! I touched it and it reminded of REBOL interpreter. I downloaded leningen-1.3.0, and lein batch. I put leningen-1.3.0.jar on by path. Hmmm, I got electrified. Now, I can make boast by saying this "is the real one". Thanks for sharing ... and for considering me among the people so favored to try it. Regards, Emeka On Sat, Aug 21, 2010 at 6:22 PM, Shantanu Kumar wrote: > The lein.bat script is now updated in the sources if some of you want > to give it a try. A summary about it is here: > > http://bit.ly/c4U2bI > > Regards, > Shantanu > > On Aug 21, 12:45 am, Shantanu Kumar wrote: > > Discovered a bug in the the bundle I uploaded, which I have fixed in > > update-1: > > > > http://github.com/downloads/kumarshantanu/leiningen/leiningen-1.3.0-u... > > > > The earlier lein.bat script uses wildcard in JAR filename in > > CLASSPATH, which is supported only in JDK 1.6. If you are using JDK > > 1.5 or certain versions of JDK 1.6, you will likely need the update-1. > > > > Regards, > > Shantanu > > > > On Aug 20, 6:46 pm, Phil Hagelberg wrote: > > > > > > > > > On Fri, Aug 20, 2010 at 2:35 AM, Shantanu Kumar > > > > > wrote: > > > > I have created a Windows distribution for Leiningen 1.3.0 (by pruning > > > > and modifying the lein.bat file a bit) that can be downloaded from > > > > here: > > > > > > > http://github.com/downloads/kumarshantanu/leiningen/leiningen-1.3.0.zip > > > > > > To install, > > > > 1. Download the bundle and unzip into a folder of your choice > > > > 2. Include the Leiningen folder in your PATH. > > > > > > In my initial tests on Windows XP 32-bit/JDK 1.6, it seems to be > > > > working okay. Please let me know how it behaves at your end. > > > > > Thanks; I'd love to integrate this once it sees some usage and gets > feedback! > > > > > -Phil > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to clojure@googlegroups.com > Note that posts from new members are moderated - please be patient with > your first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en > -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: ANN: form-dot-clj - HTML form validation and display
Thanks for sharing, I will be trying out your lib. I am doing some web
thing.
Emeka
On Fri, Aug 13, 2010 at 10:11 AM, Saul Hazledine wrote:
> Form-dot-clj is library for handling the display and validation of
> forms. It Supports HTML5 forms, javascript validation and plain HTML.
> It should work with most methods of generating HTML.
>
> http://github.com/alienscience/form-dot-clj
>
> In the last 10 minutes I have also found a library called "pour" that
> works in a similar way.
>
> http://github.com/Kaali/pour
>
> Form-dot-clj example:
>
> (def-field username
> [:maxlength 20]
> [:pattern "[A-Za-z0-9]+" "Only alphanumeric characters please"])
>
> (def-field email-address
> [:email "Sorry, that style of email address is not supported"])
>
> (def-form example
> {:size 20 :required "Please fill this in"}
> :username (textbox username)
> :email(textbox email-address))
>
> ;; Use the following function to show the form when generating html
> (show-controls example)
>
> ;; Use the following function to validate a post of this form
> (on-post example params success-fn failure-fn)
>
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Re: let binding and recursive function
Hello John, I would want to add something to what Justin said. (defn goo [ i k & l] (println l)) => (goo 2 3 [233]) ;;; gives ([233]) (conj '([233]) ...) (defn goo [i k & [l]](println l)) =>(goo 2 3 [233]) ;;; gives [233] (conj [233] ...) Hope the difference is clear now. Emeka On Mon, Aug 2, 2010 at 10:43 PM, John Sanda wrote: > Thanks for the response and suggestions Justin. A co-worker also just > suggested multiple arg lists which is perfect. He also suggested (or foo > bar) to further simplify my code. It definitely cleans the code up and > improves readability. > > - John > > > On Mon, Aug 2, 2010 at 5:37 PM, Justin Kramer wrote: > >> I think you want: >> >> (defn- do-traversal [tree idx & [tree-traversal]] >> ...) >> >> Note the extra brackets for destructuring. >> >> Another alternative is using multiple arg lists: >> >> (defn- do-traversal >> ([tree idx] >>(do-traversal tree idx [])) >> ([tree idx traversal] >>...)) >> >> Lastly, FYI, the form (if foo foo bar) can be simplified to (or foo >> bar). >> >> Hope that helps, >> >> Justin >> >> On Aug 2, 5:04 pm, John Sanda wrote: >> > I've just implemented an inorder traversal function for a vector-based >> tree. >> > The functions look like, >> > >> > (defn- do-traversal [tree idx traversal] >> > (cond >> >(not (node-exists? tree idx)) traversal >> >(leaf? tree idx) (conj traversal (tree idx)) >> >:else (apply conj >> > (do-traversal tree (left-child idx) traversal) >> > (tree idx) >> > (do-traversal tree (right-child idx) traversal >> > >> > (inorder-traversal [tree] >> > (do-traversal tree root-idx [])) >> > >> > This works as expected but now I am looking to refactor the code some. I >> > wanted to see if I could do away passing an empty vector to the >> do-traversal >> > function. So I updated do-traversal to look like, >> > >> > (defn- do-traversal [tree idx & tree-traversal] >> > (let [traversal (if tree-traversal tree-traversal [])] >> >(cond >> > (not (node-exists? tree idx)) traversal >> > (leaf? tree idx) (conj traversal (tree idx)) >> > :else (apply conj >> > (do-traversal tree (left-child idx) traversal) >> > (tree idx) >> > (do-traversal tree (right-child idx) traversal) >> > >> > When the expected traversal for a tree is [10 20 30] I instead get ([] >> 30 20 >> > 10 [])) in my unit test. Can someone explain to me why using let as I >> have >> > done does not work, and what another solution might be? >> > >> > Thanks >> > >> > - John >> >> -- >> You received this message because you are subscribed to the Google >> Groups "Clojure" group. >> To post to this group, send email to clojure@googlegroups.com >> Note that posts from new members are moderated - please be patient with >> your first post. >> To unsubscribe from this group, send email to >> clojure+unsubscr...@googlegroups.com >> For more options, visit this group at >> http://groups.google.com/group/clojure?hl=en > > > > > -- > > - John > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to clojure@googlegroups.com > Note that posts from new members are moderated - please be patient with > your first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en > -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Installing emacs using leiningen on Windows Vista
Hello All, I need your support here. While troubleshooting I added "echo CLASSPATH". C:\Users\rmicro\goog>lein swank ";C:\Users\rmicro\goog\lib\ swank-clojure-1.2.1.jar" "C:\cygwin\clein\leiningen-1.1.0-standalone.jar";";C:\Users\rmicro\goog\lib\swan k-clojure-1.2.1.jar";".;C:\Program Files\Java\jre6\lib\ext\QTJava.zip" The above is the content of my class path. Is there anything wrong? This is the failure I got. Exception in thread "main" Could not find clojure.main. Make sure you have it in your classpath (NO_SOURCE_FILE:0) at clojure.lang.Compiler.eval(Compiler.java:4658) at clojure.core$eval__5236.invoke(core.clj:2017) at clojure.main$eval_opt__7411.invoke(main.clj:227) at clojure.main$initialize__7418.invoke(main.clj:246) at clojure.main$null_opt__7446.invoke(main.clj:271) at clojure.main$main__7466.doInvoke(main.clj:346) at clojure.lang.RestFn.invoke(RestFn.java:426) at clojure.lang.Var.invoke(Var.java:363) at clojure.lang.AFn.applyToHelper(AFn.java:175) at clojure.lang.Var.applyTo(Var.java:476) at clojure.main.main(main.java:37) Caused by: Could not find clojure.main. Make sure you have it in your classpath at org.apache.tools.ant.taskdefs.ExecuteJava.execute(ExecuteJava.java:17 0) at org.apache.tools.ant.taskdefs.Java.run(Java.java:710) at org.apache.tools.ant.taskdefs.Java.executeJava(Java.java:178) at org.apache.tools.ant.taskdefs.Java.execute(Java.java:84) at leiningen.compile$eval_in_project__799.doInvoke(compile.clj:141) at clojure.lang.RestFn.invoke(RestFn.java:430) at leiningen.swank$swank__818.doInvoke(swank.clj:11) at clojure.lang.RestFn.invoke(RestFn.java:447) at leiningen.swank$swank__818.invoke(swank.clj:13) at leiningen.swank$swank__818.invoke(swank.clj:14) at clojure.lang.Var.invoke(Var.java:359) at clojure.lang.AFn.applyToHelper(AFn.java:173) at clojure.lang.Var.applyTo(Var.java:476) at clojure.core$apply__4370.invoke(core.clj:436) at leiningen.core$_main__46$fn__49.invoke(core.clj:81) at leiningen.core$_main__46.doInvoke(core.clj:78) at clojure.lang.RestFn.invoke(RestFn.java:413) at user$eval__55.invoke(NO_SOURCE_FILE:1) at clojure.lang.Compiler.eval(Compiler.java:4642) ... 10 more -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Leiningen on windows
Hello All, I need the following; The clojure version to be used, The best way to configure Leiningen on Vista, Examples I am currently try out instructions on this site http://charsequence.blogspot.com/2010/06/setup-leiningen-on-windows.html Regards, Emeka -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Using PRXML lib
Thanks, it worked :( On Sat, Jun 12, 2010 at 8:23 PM, Moritz Ulrich wrote: > You can use (with-out-str &body) to capture the output or prxml to a > string and write that string to a file. > > On Sat, Jun 12, 2010 at 8:53 PM, Emeka wrote: > > Could someone direct me on how to write the output of prxml form to a > file? > > > > -- > Moritz Ulrich > Programmer, Student, Almost normal Guy > > http://www.google.com/profiles/ulrich.moritz > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to clojure@googlegroups.com > Note that posts from new members are moderated - please be patient with > your first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Using PRXML lib
Hello Moritz, prxml form prints on the console, my aim is to redirect it to print to a file. I have not been able to achieve this. I have looked at the prxml lib code, it prints to *out*, it returns nil. My interest is on capturing the output of prxml and writing it to a file. Regards, Emeka On Sat, Jun 12, 2010 at 8:23 PM, Moritz Ulrich wrote: > You can use (with-out-str &body) to capture the output or prxml to a > string and write that string to a file. > > On Sat, Jun 12, 2010 at 8:53 PM, Emeka wrote: > > Could someone direct me on how to write the output of prxml form to a > file? > > > > -- > Moritz Ulrich > Programmer, Student, Almost normal Guy > > http://www.google.com/profiles/ulrich.moritz > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to clojure@googlegroups.com > Note that posts from new members are moderated - please be patient with > your first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Using PRXML lib
Hello All, Could someone direct me on how to write the output of prxml form to a file? Regards, Emeka -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Clojure Africa
Hello All, I have heard of Clojure this , Clojure that, virtually every continent (every country) is duly represented except Africa. I have not heard of Clojure Africa, someone here is tell me to call it Clojure South Africa. Now , I have decided to start off somethingClojure Africa. Come join us. http://groups.google.com/group/clojure-africa Regards, Emeka -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Vimclojure Performance on Windows
Meikel, Is Vimclojure stable enough to have it on my Window's Vista? I tried it out before without success. Regards, Emeka On Fri, Feb 26, 2010 at 6:22 AM, Meikel Brandmeyer wrote: > Hi, > > On Feb 25, 4:46 pm, Vitaly Peressada wrote: > > > Installed vimclojure-2.1.2 on Windows XP SP3. Have dual-core machine > > and 4GB of RAM. In VimRepl > > (println "Hello World") takes about 10 seconds. Is this expected? > > No. Vim shells out to another process. This is the only real portable > and stable way to talk to other process with Vim. This is slow. > However on my MacBook (dual-core, 1G RAM) the delay is not noticeable. > On my crappy Windows Laptop (single-core, 1.7Gh, 2G RAM) at work, the > delay is noticeable but well below a second. > > The only exception is the first command, which (as a side effect) sets > up the whole clojure machinery in the background. But subsequent > commands should be much faster. > > > Any suggestions how to speed this up? > > No clue. You are the first to report such a problem. > > Sincerely > Meikel > > PS: there is also the vimclojure google group for such support issues. > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to clojure@googlegroups.com > Note that posts from new members are moderated - please be patient with > your first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en > -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: find source file for namespace?
Hello nchubrich, I thinking that you can do this with easy using namespace which would lead you to resolve the file name and then figure out the path. Emeka On Mon, Dec 28, 2009 at 2:43 AM, nchubrich wrote: > Does anyone know how to dynamically access the pathname for a > particular piece of code? I.E., I'd like to be able to write a > function that can be called in any context and returns the pathname > for the code it was called in. (My intended use for this is to > develop a testing package; I want to figure out an appropriate place > to save the test files.) > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to clojure@googlegroups.com > Note that posts from new members are moderated - please be patient with > your first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
My belated Xmas gift
Hello All, I wanted something that could help make life a little easier for me, that was what motivated me to write the below code. However, when I showed it to a friend, he pointed out that clojure 1.1 has juxt function. So, I quickly changed its name to apply-juxt. I invite your comments and if you like it please use it. Merry Christmas!! (defn apply-juxt [d & body] (map #(apply % body) d)) (apply-juxt [* - +] 8 7) Regards, Emeka -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Funding Clojure 2010
I have not done something like this before but your Clojure changed my life , so I owe you something. However, coming from a far away continent(with low income per head) I may not be able to match 100/developer/year price. I hope you won't mind my widow's might when it comes. Emeka On Mon, Dec 14, 2009 at 6:19 PM, BerlinBrown wrote: > > > On Dec 14, 9:33 am, Rich Hickey wrote: > > Funding Clojure 2010 > > > > Background > > -- > > > > It is important when using open source software that you consider who > > is paying for it, because someone is. There is no such thing as free > > software. > > > > Sometimes open source software is developed under a license with > > undesirable properties (e.g. the GPL), such that people are willing to > > pay for a (proprietary) version of it that is not subject to that > > license. Both Monty Widenius [1] and Richard Stallman [2] have argued > > for the necessity of such a mechanism to fund open source software, > > lest there be insufficient resources for its development. Clojure > > doesn't use the GPL, thus conveying more freedom to its users, but > > precluding me from funding it via dual licensing. > > > > Some companies develop technology as a component of a proprietary > > product or service, absorbing it as a necessary expense, only to > > decide that it is not a core, unique, or advantage-bearing business > > function. They can reduce their costs in ongoing development by open > > sourcing it, deriving benefit from community contributions and letting > > them focus on their core business [3]. It is important to note that > > the bulk of the costs are often in the original development, and are > > paid for by the proprietary product or service. That is not the case > > for Clojure. > > > > Some open source is the product of academic research, and is funded by > > the academic institution and/or research grants [4]. That is not the > > case for Clojure. > > > > Some open source software is (partially) funded by proprietary > > support. It is important to note that often the support income does > > not in fact make it to the people who create the software. Such income > > models work best for support sold to conservative enterprises [5]. > > That is not the case for Clojure. > > > > Some companies 'fund' open source software by dedicating some of their > > employees' time, or making investments, in its development. There must > > be some business value to the company for doing so (e.g. it helps them > > sell hardware [6]), and thus is ultimately paid for by their > > proprietary products/services. That is not the case for Clojure. > > > > There *are* companies that make software themselves, whose consumers > > see a value in it and willingly pay to obtain that value. The money > > produced by this process pays the salaries of the people who are > > dedicated to making it, and some profit besides. It's called > > "proprietary software". People pay for proprietary software because > > they have to, but otherwise the scenario is very similar to open > > source - people make software, consumers get value from it. In fact, > > we often get a lot less with proprietary software - vendor lock-in, no > > source etc. Most alarmingly, this is the only model that associates > > value with software itself, and therefore with the people who make it. > > > > Why don't people pay for open source software? Primarily, because they > > don't *have to*. I think also, partially, it is because open source > > software often doesn't have a price tag. I think it should. I'd like > > to pay for open source, and know the money is going to those who > > create it. I'd like companies to *expect* to pay for it. I'd like to > > see people make a living (and even profit!) directly making open > > source, not as a side effect of some other proprietary process, to > > dedicate themselves to it, and not have it be hobby/side work. > > > > Unfortunately, there seems to be no way to convey the full benefits of > > open source software while *forcing* people to pay for it. Only in the > > proprietary (including dual-license) model is there a direct > > connection between the consumers of software and the funding of those > > that produce it. This is having the effect of driving open source > > software towards having zero apparent cost, becoming a free bounty of > > someone else's other profitable endeavors, and is severely > > compromising our profession. > > > >
Re: Transforming a Seq to a Map
(apply has-map (apply concat (map (fn [b] [(apply hash-map (apply concat
(butlast b))) (val (last b))]) (list {9 5 9 9 7 8} {3 4 5 6 7 0}
{{3 4, 5 6} 0, {8 9, 9 5} 8}
I just added some noise!
On Wed, Nov 18, 2009 at 2:05 PM, Sean Devlin wrote:
> user=>(def your-data [{:a 1 :b 2 :c 3} {:a 4 :b 5 :c 6} {:a 7 :b 8 :c
> 9}])
>
> user=>(into {} (map (juxt #(dissoc % :c) :c) your-data))
>
> {{:a 1, :b 2} 3, {:a 4, :b 5} 6, {:a 7, :b 8} 9}
>
> On Nov 18, 8:36 am, Rich Hickey wrote:
> > On Wed, Nov 18, 2009 at 8:19 AM, Robert Campbell
> wrote:
> > > Hey guys,
> >
> > > I'm having some trouble finding a nice way to perform a map
> > > transformation I need. I need to transform this:
> >
> > > [ {:a 1 :b 2 :c 3} {:a 4 :b 5 :c 6} {:a 7 :b 8 :c 9} ]
> >
> > > into this:
> >
> > > { {:a 1 :b 2} 3 {:a 4 :b 5} 6 {:a 7 :b 8} 9 }
> >
> > > I wanted to use map, but each f in map only returns one value, so I
> > > couldn't figure it out. Here is what I have now:
> >
> > > (def result (ref {}))
> > > (for [item coll]
> > >(dosync (alter result assoc (dissoc item :c) (item :c
> > > ; result should now have correct value
> >
> > > I also wrote a recursive version to build the map without using a ref,
> > > but I feel like I'm missing a simpler way..
> >
> > (into {}
> > (map (fn [m] [(dissoc m :c) (:c m)])
> > [{:a 1 :b 2 :c 3} {:a 4 :b 5 :c 6} {:a 7 :b 8 :c 9}]))
> >
> > -> {{:a 1, :b 2} 3, {:a 4, :b 5} 6, {:a 7, :b 8} 9}
> >
> > Rich
>
> --
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Re: positions
John, You should have added that you code came from Programming Clojure. Regards, Emeka On Thu, Nov 19, 2009 at 8:05 PM, John Harrop wrote: > On Thu, Nov 19, 2009 at 1:23 PM, Sean Devlin wrote: > >> Try clojure.contrib.seq-utils :) >> >> As a learning exercise, I'd recommend re-writing it to be lazy. Your >> version is eager because it uses loop. In order to make it lazy, >> you'd want to construct a lazy-seq. See the macro w/ the same name. >> >> Another choice is to use built-in functions, like this: >> >> (defn positions [pred coll] >> (map second >>(filter (comp pred first) >> (map vector coll (iterate inc 0) > > > (defn indexed [coll] > (map vector (iterate inc 0) coll)) > > (defn positions [pred coll] > (for [[i e] (indexed coll) :when (pred e)] i)) > > Seems to work: > > user=> (positions even? [1 1 2 9 3 4 8 7 6]) > (2 5 6 8) > > (yes, I know there's already an "indexed" with similar semantics in > clojure.contrib.) > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to clojure@googlegroups.com > Note that posts from new members are moderated - please be patient with > your first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en > -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: positions
Nick, Remember to re-visit indexed and index-filter functions of programming Clojure. Regard, Emeka On Thu, Nov 19, 2009 at 7:13 PM, nchubrich wrote: > Thanks Sean, I'll do the exercise. I don't know how I missed it in > seq-utils. > After months of programming Clojure, I realize how much I still > have to learn. > (Knowledge is power; knowledge of lack of knowledge is power to > power.) > > Nick. > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to clojure@googlegroups.com > Note that posts from new members are moderated - please be patient with > your first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en > -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: equivalent to Haskell's group function
(defn group [x] (loop [newlist [] currlist x] (if (not (empty? x)) (recur (newlist (cons (first x) newlist)) (newlist (cons (first x) newlist)) You are making a function call here using an empty vector and your argument is a list. This is not possible, that's why you have that error ([] (cons 7 [])). When you make a vector a function its argument should the integer. Try and rework your code. (currlist (drop-while #(= (first currlist) %) currlist)) This won't work too. drop-while returns a lazy sequence so you have (currlist (..)) I would advice that you should spend some time with clojure, learning its data structures, function call and others in order to full appreciate how things play out . Regards, Emeka On Mon, Nov 9, 2009 at 7:08 PM, Wilson MacGyver wrote: > > Thanks guys for the various solutions. I set out trying to try a recur > solution > > So I came up with this. the idea is to go through the collection being > passed, and grab one element, then do drop-while until a different > element is encountered. repeat until there is no more left in the > collection. > > (defn group [x] > (loop [newlist [] currlist x] > (if (not (empty? x)) >(recur (newlist (cons (first x) newlist)) > (currlist (drop-while #(= (first currlist) %) currlist)) > > > > It seems logical to me, but when I tried it with > (group [1 1 2 2 3 3 ]) > > I get > CompilerException java.lang.IllegalArgumentException: Key must be integer > > what am I missing? > > Thanks > > > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: equivalent to Haskell's group function
Meikel, What is the gain of using lazy-seq here? Why can't we go without laziness? (defn group [s] (when-let [s (seq s)] (let [f(first s) [fs & r] (split-with #(= % f) s)] (cons fs (group r) Regards, Emeka On Mon, Nov 9, 2009 at 4:44 PM, Emeka wrote: > Meikel, > > Is like you over engineered your version? > (defn group > [s] > (lazy-seq > (when-let [s (seq s)] > (let [f(first s) > [fs & r] (split-with #(= % f) s)] > (cons fs (group r)) > Should be .. > > (defn group > [s] > (lazy-seq > (when-let [s (seq s)] > (let [f(first s) > [fs r] (split-with #(= % f) s)] > (cons fs (group r)) > > & > > Regards, > Emeka > >> >> > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: equivalent to Haskell's group function
Meikel, Is like you over engineered your version? (defn group [s] (lazy-seq (when-let [s (seq s)] (let [f(first s) [fs & r] (split-with #(= % f) s)] (cons fs (group r)) Should be .. (defn group [s] (lazy-seq (when-let [s (seq s)] (let [f(first s) [fs r] (split-with #(= % f) s)] (cons fs (group r)) & Regards, Emeka > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: can I make this faster (and leaner) ?
Hello Sir, (def *valid-chars* (vec "abcdefghijklmnopqrstuvwxuz0123456789" )) This looks cleaner. Regards, Emeka On Sat, Oct 31, 2009 at 1:15 PM, John Harrop wrote: > On Fri, Oct 30, 2009 at 7:47 PM, DavidF wrote: > >> >> Try this: >> >> (def *valid-chars* [ \a \b \c \d \e \f \g \h \i \j \k \l \m >> \n \o \p \q \r \s \t \u \v \w \x \u \z >> \0 \1 \2 \3 \4 \5 \6 \7 \8 \9 ] ) >> >> (defn generate-key [keylength] >>(for [x (range keylength)] (nth *valid-chars* (rand-int (count >> *valid- >> chars*) > > > There's a perfectly good reusable function hidden in there: > > (defn rand-elt [coll] > (nth coll (rand-int (count coll > > (defn generate-key [key-length] > (for [x (range key-length)] (rand-elt *valid-chars*))) > > And you might want to wrap that for loop in (apply str ~the-loop). It also > might be more idiomatic to call *valid-chars* +valid-chars+ if it's not > normally going to be rebound or otherwise changed. > > (While we're on the topic of valid chars, how come the reader page > http://clojure.org/reader at clojure.org doesn't list as legal identifier > characters some characters that occur in identifiers in clojure.core? > Specifically, =, >, and <. > > > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Periodic tasks
John, Is like I am missing something? This thread mentioned making periodic tasks, there was a java example to it. However, what you posted I am yet to figure out how to make a periodic tasks possible. Regards, Emeka On Sat, Oct 31, 2009 at 6:27 PM, John Harrop wrote: > On Sat, Oct 31, 2009 at 12:36 PM, Luke VanderHart < > luke.vanderh...@gmail.com> wrote: > >> Why not just run an agent that does something, then calls sleep for N >> seconds, then calls the next thing? >> >> Granted, it will eat up a thread in your agent thread pool, but if >> you've only got one of these in the app it shouldn't be a problem. >> >> Or you could go the Java route, and start a daemon thread manually. > > > Or you could use send-off instead of send; send-off doesn't consume from a > finite thread pool and is thus suitable for long-running (or blocking, e.g. > I/O) tasks. > > Incidentally, if you ever want to simply reset the state of an agent to a > particular value, analogously to ref-set and reset!, this can work: > > (defn set-agent [a v] (send a (fn [_] v))) > > > > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: PATCH: AFn.java, RestFN.java (a better throwArity message)
John, That is why I asked that question because I figured out that the problem has nothing to do with Vector but with #() read macro. I wanted to correct the impression that the problem was from Vector. Regards, Emeka --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: reading a range from a large file
> > (with-open [#^Reader r (reader "FILE")] > (with-open [lr (java.io.LineNumberReader. r)] > (.setLineNumber lr 5) > ;; Your code here. > ))) > > Can't the below work? (with-open [#^Reader r (reader "FILE")][lr (java.io.LineNumberReader. r)] ( Regards, Emeka --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: PATCH: AFn.java, RestFN.java (a better throwArity message)
John,
On Tue, Oct 27, 2009 at 6:10 PM, John Harrop wrote:
> On Tue, Oct 27, 2009 at 1:39 PM, Emeka wrote:
>
>> On Sun, Oct 25, 2009 at 4:57 PM, MarkSwanson
>> wrote:
>>
>>>
>>> Hello,
>>>
>>> Someone recently posed the question: (why doesn't this work)
>>> (into {} (map #([% (* % %)]) [1 2 3 4]))
>>>
>>>
>> Is this actually a Vector problem or the limitation of the anonymous
>> function?
>>
>
> Neither. It's a limitation of the #() read-macro. (fn [x] [x (* x x)])
> works just fine.
>
Is #() read-macro not an anonymous function?
Regards,
Emeka
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Re: PATCH: AFn.java, RestFN.java (a better throwArity message)
On Sun, Oct 25, 2009 at 4:57 PM, MarkSwanson wrote:
>
> Hello,
>
> Someone recently posed the question: (why doesn't this work)
> (into {} (map #([% (* % %)]) [1 2 3 4]))
>
>
Is this actually a Vector problem or the limitation of the anonymous
function?
Regards,
Emeka
> (reference:
> http://groups.google.com/group/clojure/browse_thread/thread/7d3ee57ee8041353
> )
>
> The error message was:
> Caused by: java.lang.IllegalArgumentException: Wrong number of args
> passed to: PersistentVector
>
> How many args were being passed anyway? The code looked fine (to me).
> It would have been helpful to me to know the number of args being
> passed was zero.
>
> With the patch below the error message would look like this:
>
> ... java.lang.IllegalArgumentException: Wrong number of args (0)
> passed to: PersistentVector ...
>
> The patch will handle all cases of wrong arity and report the expected
> number of args. In some cases (RestFN) the exception will now report
> the required arity as well as the given arity.
>
> There is one improvement that could still be made to the patch:
> applyTo(ISeq args) -> should report the count of args:
> - return throwArity();
> + return throwArity(-1, reqArity); // TODO/BUG: -1 should be count
> of args
>
> I'm running out the door and don't have time to code this.
>
> Please consider this patch - or something like it.
>
>
>
> diff --git a/src/jvm/clojure/lang/AFn.java b/src/jvm/clojure/lang/
> AFn.java
> index e2646ad..56afa8f
> 100644
> --- a/src/jvm/clojure/lang/
> AFn.java
> +++ b/src/jvm/clojure/lang/
> AFn.java
> @@ -45,110 +45,110 @@ public void run()
> {
>
>
> public Object invoke() throws Exception
> {
> - return throwArity
> ();
> + return throwArity
> (0);
> }
>
> public Object invoke(Object arg1) throws Exception
> {
> - return throwArity
> ();
> + return throwArity
> (1);
> }
>
> public Object invoke(Object arg1, Object arg2) throws Exception
> {
> - return throwArity
> ();
> + return throwArity
> (2);
> }
>
> public Object invoke(Object arg1, Object arg2, Object arg3) throws
> Exception{
> - return throwArity
> ();
> + return throwArity
> (3);
> }
>
> public Object invoke(Object arg1, Object arg2, Object arg3, Object
> arg4) throws Exception
> {
> - return throwArity
> ();
> + return throwArity
> (4);
> }
>
> public Object invoke(Object arg1, Object arg2, Object arg3, Object
> arg4, Object arg5) throws Exception
> {
> - return throwArity
> ();
> + return throwArity
> (5);
> }
>
> public Object invoke(Object arg1, Object arg2, Object arg3, Object
> arg4, Object arg5, Object arg6) throws Exception
> {
> - return throwArity
> ();
> + return throwArity
> (6);
> }
>
> public Object invoke(Object arg1, Object arg2, Object arg3, Object
> arg4, Object arg5, Object arg6, Object
> arg7)
>throws Exception
> {
> - return throwArity
> ();
> + return throwArity
> (7);
> }
>
> public Object invoke(Object arg1, Object arg2, Object arg3, Object
> arg4, Object arg5, Object arg6, Object
> arg7,
> Object arg8) throws Exception
> {
> - return throwArity
> ();
> + return throwArity
> (8);
> }
>
> public Object invoke(Object arg1, Object arg2, Object arg3, Object
> arg4, Object arg5, Object arg6, Object
> arg7,
> Object arg8, Object arg9) throws Exception
> {
> - return throwArity
> ();
> + return throwArity
> (9);
> }
>
> public Object invoke(Object arg1, Object arg2, Object arg3, Object
> arg4, Object arg5, Object arg6, Object
> arg7,
> Object arg8, Object arg9, Object arg10) throws
> Exception{
> - return throwArity
> ();
> + return throwArity
> (10);
> }
>
> public Object invoke(Object arg1, Object arg2, Object arg3, Object
> arg4, Object arg5, Object arg6, Object
> arg7,
> Object arg8, Object arg9, Object arg10, Object
> arg11) throws Exception
> {
> - return throwArity
> ();
> + return throwArity
> (11);
> }
>
> public Object invoke(Object arg1, Object arg2, Object arg3, Object
> arg4, Object arg5, Object arg6, Object
> arg7,
> Object arg8, Object arg9, Object arg10, Object
> arg11, Object arg12) throws Exception
> {
> - return throwArity
> ();
> + return throwArity
> (12);
> }
>
> public Object invoke(Object arg1, Object arg2,
Re: server-socket on exit event
Ngo, I checked out your github , it is great. I have not used netty, it looks clean. However, what is the meaning of this, (def reshedule nil)? Regards, Emeka On Thu, Oct 15, 2009 at 3:02 AM, ngocdaothanh wrote: > > I created this (Netty is used instead of server-socket): > http://github.com/ngocdaothanh/telchat-clojure > > I am going to create a Scala version of the same program to have a > feeling of Clojure vs Scala, it will be telchat-scala. > > > On Oct 14, 10:12 pm, Emeka wrote: > > Ngo, > > > > Honestly speaking I don't know. How far have you gone? > > > > Regards, > > Emeka > > > > On Sat, Oct 3, 2009 at 3:21 PM, ngocdaothanh > wrote: > > > > > Emeka, good catch. It's just my mistake. > > > > > Another thing is I think there may be exception raised when on-msg > > > sends message to a closed socket. How would you solve this? > > > > > On Oct 3, 7:35 pm, Emeka wrote: > > > > ngo, > > > > I was about doing this kind of client/server thing some days ago, > > > however > > > > now you are into it I would like to learn then. I am not quite clear > why > > > you > > > > have this: > > > > (.start (new Thread (fn [] (create-server 8080 chat-loop > > > > > > My concern is on Thread, create-server function has a Thread inside > > > > create-server-aux function. > > > > > > Regards, > > > > Emeka > > > > > > On Fri, Oct 2, 2009 at 3:13 AM, ngocdaothanh > > > > wrote: > > > > > > > > I'm not sure TCP/IP has a native facility for that. > > > > > > > I'm afraid John's statement is correct: > > > > > > > > http://www.velocityreviews.com/forums/t125620-client-socket-disconnec. > > > .. > > > > > and trying to read and write until something wrong happens as > > > > > demonstrated in Roger's code is the only way to check for > > > > > disconnection. > > > > > > > Below is my new code. Sorry it is rather long. > > > > > > > (import '[java.io BufferedReader InputStreamReader > > > > > OutputStreamWriter]) > > > > > (use 'clojure.contrib.server-socket) > > > > > > > (def clients (ref [])) ; Each client is an *out* > > > > > > > (defn on-msg [from msg] > > > > > (println msg) > > > > > (doall > > > > >(map > > > > > (fn [client] > > > > >(if-not (= from client) > > > > > (binding [*out* client] > > > > >(println msg) > > > > >(flush > > > > > @clients))) > > > > > > > (defn on-disconnect [client] > > > > > (dosync > > > > >(alter clients > > > > > (fn [clients] > > > > >(remove (fn [c] (= c client)) clients > > > > > (on-msg client "A client has disconnected")) > > > > > > > (defn on-connect [client] > > > > > (dosync (alter clients conj client)) > > > > > (on-msg client "A client has connected")) > > > > > > > (defn chat-loop [is os] > > > > > (let [client (OutputStreamWriter. os)] > > > > >(on-connect client) > > > > >(binding [*in* (BufferedReader. (InputStreamReader. is))] > > > > > (loop [] > > > > >(let [msg (read-line)] ; msg is nil when the client > > > > > disconnects > > > > > (if (nil? msg) > > > > >(on-disconnect client) > > > > >(do > > > > > (on-msg client msg) > > > > > (recur > > > > > > > (.start (new Thread (fn [] (create-server 8080 chat-loop > > > > > > > On Oct 2, 5:20 am, John Harrop wrote: > > > > > > On Thu, Oct 1, 2009 at 4:02 PM, Roger Gilliar > > > wrote: > > > > > > > Am 01.10.2009 um 21:28 schrieb ngocdaothanh: > > > > > > > > Roger, your code is not event based. > > > > > > > What do you mean by not event based ? > > > > > > > > He means he wants automatic notification if a connection is > dropped. > > > > > > > > I'm not sure TCP/IP has a native facility for that. > > > > > > > > What most chat type programs, multiplayer games, and suchlike do > is > > > send > > > > > a > > > > > > periodic ping from server to each connected client, which as part > of > > > the > > > > > > chat protocol the client is supposed to acknowledge. If a client > > > stops > > > > > > responding for more than a few ping-intervals, it's assumed to > have > > > > > > disconnected or otherwise become unreachable. > > > > > > > > This method has the advantage of being entirely under the control > of > > > the > > > > > > application layer, and the further advantage of also working with > UDP > > > > > (which > > > > > > is crucial in the "multiplayer games" case at least). > > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: server-socket on exit event
Ngo, Honestly speaking I don't know. How far have you gone? Regards, Emeka On Sat, Oct 3, 2009 at 3:21 PM, ngocdaothanh wrote: > > Emeka, good catch. It's just my mistake. > > Another thing is I think there may be exception raised when on-msg > sends message to a closed socket. How would you solve this? > > > On Oct 3, 7:35 pm, Emeka wrote: > > ngo, > > I was about doing this kind of client/server thing some days ago, > however > > now you are into it I would like to learn then. I am not quite clear why > you > > have this: > > (.start (new Thread (fn [] (create-server 8080 chat-loop > > > > My concern is on Thread, create-server function has a Thread inside > > create-server-aux function. > > > > Regards, > > Emeka > > > > On Fri, Oct 2, 2009 at 3:13 AM, ngocdaothanh > wrote: > > > > > > I'm not sure TCP/IP has a native facility for that. > > > > > I'm afraid John's statement is correct: > > > > >http://www.velocityreviews.com/forums/t125620-client-socket-disconnec. > .. > > > and trying to read and write until something wrong happens as > > > demonstrated in Roger's code is the only way to check for > > > disconnection. > > > > > Below is my new code. Sorry it is rather long. > > > > > (import '[java.io BufferedReader InputStreamReader > > > OutputStreamWriter]) > > > (use 'clojure.contrib.server-socket) > > > > > (def clients (ref [])) ; Each client is an *out* > > > > > (defn on-msg [from msg] > > > (println msg) > > > (doall > > >(map > > > (fn [client] > > >(if-not (= from client) > > > (binding [*out* client] > > >(println msg) > > >(flush > > > @clients))) > > > > > (defn on-disconnect [client] > > > (dosync > > >(alter clients > > > (fn [clients] > > >(remove (fn [c] (= c client)) clients > > > (on-msg client "A client has disconnected")) > > > > > (defn on-connect [client] > > > (dosync (alter clients conj client)) > > > (on-msg client "A client has connected")) > > > > > (defn chat-loop [is os] > > > (let [client (OutputStreamWriter. os)] > > >(on-connect client) > > >(binding [*in* (BufferedReader. (InputStreamReader. is))] > > > (loop [] > > >(let [msg (read-line)] ; msg is nil when the client > > > disconnects > > > (if (nil? msg) > > >(on-disconnect client) > > >(do > > > (on-msg client msg) > > > (recur > > > > > (.start (new Thread (fn [] (create-server 8080 chat-loop > > > > > On Oct 2, 5:20 am, John Harrop wrote: > > > > On Thu, Oct 1, 2009 at 4:02 PM, Roger Gilliar > wrote: > > > > > Am 01.10.2009 um 21:28 schrieb ngocdaothanh: > > > > > > Roger, your code is not event based. > > > > > What do you mean by not event based ? > > > > > > He means he wants automatic notification if a connection is dropped. > > > > > > I'm not sure TCP/IP has a native facility for that. > > > > > > What most chat type programs, multiplayer games, and suchlike do is > send > > > a > > > > periodic ping from server to each connected client, which as part of > the > > > > chat protocol the client is supposed to acknowledge. If a client > stops > > > > responding for more than a few ping-intervals, it's assumed to have > > > > disconnected or otherwise become unreachable. > > > > > > This method has the advantage of being entirely under the control of > the > > > > application layer, and the further advantage of also working with UDP > > > (which > > > > is crucial in the "multiplayer games" case at least). > > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: ANN: scriptjure, a library for generating javascript
Allen, Great job! Did you try (defmulti emit class) ? Regards, Emeka On Thu, Oct 8, 2009 at 7:18 AM, Meikel Brandmeyer wrote: > > Hi, > > On Oct 8, 7:50 am, Jarkko Oranen wrote: > > > I took a quick look, and that looks really neat. One thing though: > > Instead of the "clj" form to escape back to clojure, why not just use > > "unquote" (and possibly unquote-splicing)? that would allow you to use > > the ~ reader macro as a shortcut, just like in syntax-quote. > > +1 > > Sincerely > Meikel > > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: server-socket on exit event
ngo, I was about doing this kind of client/server thing some days ago, however now you are into it I would like to learn then. I am not quite clear why you have this: (.start (new Thread (fn [] (create-server 8080 chat-loop My concern is on Thread, create-server function has a Thread inside create-server-aux function. Regards, Emeka On Fri, Oct 2, 2009 at 3:13 AM, ngocdaothanh wrote: > > > I'm not sure TCP/IP has a native facility for that. > > I'm afraid John's statement is correct: > > http://www.velocityreviews.com/forums/t125620-client-socket-disconnection-event-not-received-on-server-socket-java-nio.html > and trying to read and write until something wrong happens as > demonstrated in Roger's code is the only way to check for > disconnection. > > Below is my new code. Sorry it is rather long. > > (import '[java.io BufferedReader InputStreamReader > OutputStreamWriter]) > (use 'clojure.contrib.server-socket) > > (def clients (ref [])) ; Each client is an *out* > > (defn on-msg [from msg] > (println msg) > (doall >(map > (fn [client] >(if-not (= from client) > (binding [*out* client] >(println msg) >(flush > @clients))) > > (defn on-disconnect [client] > (dosync >(alter clients > (fn [clients] >(remove (fn [c] (= c client)) clients > (on-msg client "A client has disconnected")) > > (defn on-connect [client] > (dosync (alter clients conj client)) > (on-msg client "A client has connected")) > > (defn chat-loop [is os] > (let [client (OutputStreamWriter. os)] >(on-connect client) >(binding [*in* (BufferedReader. (InputStreamReader. is))] > (loop [] >(let [msg (read-line)] ; msg is nil when the client > disconnects > (if (nil? msg) >(on-disconnect client) >(do > (on-msg client msg) > (recur > > (.start (new Thread (fn [] (create-server 8080 chat-loop > > > On Oct 2, 5:20 am, John Harrop wrote: > > On Thu, Oct 1, 2009 at 4:02 PM, Roger Gilliar wrote: > > > Am 01.10.2009 um 21:28 schrieb ngocdaothanh: > > > > Roger, your code is not event based. > > > What do you mean by not event based ? > > > > He means he wants automatic notification if a connection is dropped. > > > > I'm not sure TCP/IP has a native facility for that. > > > > What most chat type programs, multiplayer games, and suchlike do is send > a > > periodic ping from server to each connected client, which as part of the > > chat protocol the client is supposed to acknowledge. If a client stops > > responding for more than a few ping-intervals, it's assumed to have > > disconnected or otherwise become unreachable. > > > > This method has the advantage of being entirely under the control of the > > application layer, and the further advantage of also working with UDP > (which > > is crucial in the "multiplayer games" case at least). > > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Re: "Schema" for data structures
Artyom, > (provide/contract >[interp (-> AE? number?)]) > > ;; interpret an arithmetical expression yielding a number > (define (interp exp) > ;; type-case is very much like a "case ... of" in Haskell/ML > (type-case AE exp > (num (n) n) > (plus (l r) (+ (interp l) (interp r))) > (sub (l r) (- (interp l) (interp r) > It also looks like clojure condp. Emeka > > Contracts work only between module boundaries though. > > Cheers, > Artyom Shalkhakov. > > > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Getting REPL transcript
Sorry, here is the link. http://gist.github.com/193550 On Sat, Sep 26, 2009 at 2:03 PM, Emeka wrote: > Thank you all. Chris Grand has figured it out for me. However, I invite you > to look at it and comment. > > Regards, > Emeka > > > On Sat, Sep 26, 2009 at 12:15 PM, Daniel Werner < > daniel.d.wer...@googlemail.com> wrote: > >> >> On Sep 23, 6:20 pm, Emeka wrote: >> > Hello All, >> > >> > I would like to have a transcript of Repl. Could someone help me out >> here? >> > >> > Regards, >> > Emeka >> >> If you use rlwrap, you can give it the --log-file (-l) argument: >> >> $ rlwrap -l repl.log java -cp ... >> >> >> > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Getting REPL transcript
Thank you all. Chris Grand has figured it out for me. However, I invite you to look at it and comment. Regards, Emeka On Sat, Sep 26, 2009 at 12:15 PM, Daniel Werner < daniel.d.wer...@googlemail.com> wrote: > > On Sep 23, 6:20 pm, Emeka wrote: > > Hello All, > > > > I would like to have a transcript of Repl. Could someone help me out > here? > > > > Regards, > > Emeka > > If you use rlwrap, you can give it the --log-file (-l) argument: > > $ rlwrap -l repl.log java -cp ... > > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Getting REPL transcript
Thanks I will look into that. But more information on 'pipe' please?
So we have two Newman{Rich, John}, so I will say thanks to Newmen.
Regards,
Emeka
On Fri, Sep 25, 2009 at 10:43 AM, John Newman wrote:
> I'm still learning, myself, so I could be wrong, but you might be able to
> use clojure.contrib.server-socket and tweak it's binding for *in*, *out*,
> and *err*, like another PushbackInputStream for *in* and copy the lines to a
> file before sending it into the repl.
>
> Or use a pipe perhaps?
>
> --
> John
>
> >
>
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Re: Getting REPL transcript
Rich, Hmm, it is what I'm looking for.Just the way I planned it to be. The next issue now is on how to craft it into clojure. Regards, Emeka On Thu, Sep 24, 2009 at 7:59 AM, Richard Newman wrote: > > > Actually, that suggests a more general point: that we can have > > programmatic access to the REPL's backlog if we modify the REPL > > process's Java code somewhat. A simple example would be to make a > > repl.class that would provide an interactive stdin/stdout repl but > > log everything to a ./repl.log file or whatever. This could be used > > to obtain a text file with the interaction history afterward, to > > massage, cut and paste from, etc. to one's heart's content in a text > > editor. Even on MS-DOS, if anyone still uses such a dinosaur. :) > > I've mentioned this before: > > http://www.franz.com/support/documentation/8.1/ansicl/dictentr/dribble.htm > > This problem has been solved for 25 years. > > > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Getting REPL transcript
Hello John , > > A standalone REPL on Windows is amenable to making the command prompt > window's backscroll big enough, if needed, and then copying from it using > the prompt window's mark/copy mode. A standalone REPL on MS-DOS is tougher. > The only way I know of short of installing Windows is to redirect the REPL's > output to a file, but then you'd have to interact with it blind, and since > it has line editing on the prompt line, the file might have escape sequences > and/or other cruft in it and need some postprocessing. It might be best in > that case to create a text file with expressions you want to evaluate at the > REPL, then run the REPL process with input redirected from this file and > output redirected to another file, to get a clean output and not have to > type blind. The downside is this isn't as interactive; you can't change your > mind or decide stuff after seeing some of the results, but only after seeing > ALL of the results and then altering the input file. > I want it to work as standalone REPL on MS-DOS. You said it is tougher,then am hopeless. I don't intend to interact with log file(for now I don't have that idea) , I would want to use it later for historical studies and may be other things. Could you give me a lead? Regards, Emeka > > I'd recommend against using a standalone REPL on DOS, or on terminal-mode > Unix which is only slightly friendlier thanks to the availability of screen. > Use a terminal emulator from a GUI desktop, if not an IDE. > > > > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Getting REPL transcript
Mic, Or use "script" . I don't think I understood clearly what you are referring to. Regards, Emeka On Wed, Sep 23, 2009 at 4:40 PM, Michael Wood wrote: > > 2009/9/23 Phil Hagelberg : > > > > Emeka writes: > > > >> I would like to have a transcript of Repl. Could someone help me out > here? > > > > Sure; run it in GNU Screen with logging turned on. > > > > $ screen -l > > $ rlwrap java -cp clojure.jar clojure.main > > => (do some stuff) > > > > It will get written to screenlog.0. > > Or use "script". > > I'm sure there was a thread about this a few months ago. There might > be some more useful suggestions if you manage to find it in the > archives. > > -- > Michael Wood > > > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Getting REPL transcript
Hello All, I would like to have a transcript of Repl. Could someone help me out here? Regards, Emeka --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Managing Clojure project files
Hello All, Please make out time and check the below link. And if you consider the code there useful, I encourage you to use it. I would appreciate your comments and reviews. http://emekamicro.blogspot.com/2009/09/managing-clojure-project-files.html Regards, Emeka --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Is knowing Java a prerequisite for using Clojure?
Hugh, I receive Factor mails, however, I am still learning Forth/Factor. IMHO, you should spend much of your time in Java while casually going through Clojure book. Factor and Clojure are FP languages and I must confess they are close cousins. I have heard you mention gcode and other stuff in Factor mailinglist but I have no clue what they are. Regards, Emeka On Fri, Sep 18, 2009 at 2:01 AM, Hugh Aguilar wrote: > > > On Sep 17, 9:33 am, Brian wrote: > > As a Java programmer coming to Clojure I would be very interested in the > > intended application. How you approach that from a Clojure perspective > is > > what I'm interested in. I've programmed in Lisp in the distant past > > (Symbolics Lisp machines) and still have very found memories of that > > environment. Having programmed in C -> C++ -> Java since then ... well I > > just miss the edit run test cycle that was so natural with those Lisp > > machines. > > I'll give you guys a brief overview of what I want to do. I'm sure > that as Clojure enthusiasts you will want to say that Clojure can do > anything. On the other hand, you might tell me that Clojure is a bad > fit and that I would be better off with xxx, and I would appreciate > that advice too. > > I want to create a DSL for generating gcode for cnc milling machines > and lathes, and maybe even more complicated machines such as 5-axis > laser cutters. I need a language (possibly Clojure) that is simple > enough to be used by non-programmers whose only background in > programming is writing gcode. > > My first choice was Forth. That is by far my own favorite language. I > am considering Clojure primarily because it offers a macro facility > somewhat comparable to Forth compile-time words, which I think is > necessary for writing a DSL. Also, it is similarly interactive, and I > can't really ask the users to compile a program and then trace it in a > debugger --- especially as I consider that to be a clumsy technique > even for me to do. I know that languages such as Groovy and Ruby have > been used for writing DSLs (Grails and Rails), and they don't have > compile-time code, but I don't really understand that kind of > programming --- I've been writing compile-time code all of my life and > that is my standard technique for simplifying programs. The reason why > I am considering Clojure rather than just going with Forth is because > I am interested in Clojure's focus on sequences and laziness. I see > this as a trade-off between thinking about programming in terms of > time (procedural, like Forth) and thinking about programming in terms > of space (sequences, like Clojure). I think that machinists would be > more comfortable thinking about space than time because they generally > work with physical objects that exist in space, and what they > primarily struggle with is thinking about time, which is what raw > gcode is all about. > > One other thing that I need is security. I had considered using > Factor, which is a Lisp/Forth hybrid. I don't think this will work > though because I can't make a language like Factor available to > machinists. The company owners would worry that these guys would trash > the data on the computer's hard-drive and/or use the language to write > computer games and generally goof around on company time. The company > owners are only going to be comfortable with allowing their employees > to program if this programming is done in a sandbox. Pretty much any > language that is written on top of another language will provide this > security. For example, Lua or FICL could be used so long as it is > crippled in such a way as to prevent the user from accessing the hard- > drive or the internet or anything except his own sandbox. Still > though, I can't just write a gcode library in C++ or Factor --- I > would need to write a scripting language on top of C++ or Factor that > provides a safe environment separate from the underlying language. > Clojure should work well because the JVM is a sandbox. There is also > more depth there because the entire Java system would be available to > the user, and still be secure. By comparison, with Lua or FICL the C++ > system is not available except for any libraries that I (laboriously) > write wrappers for. With Clojure I would get the depth of the Java > system, while still having the simplicity of Clojure --- I don't want > to try to tell machinists that they need to learn Java, especially as > I consider that to be a pretty daunting task even for me to do. > > You mentioned having come from a Common Lisp background. Would you > recommend CL rather than Clojure for what I'm doing? > > Do any of you have experience
Re: Windows user
I will wait for the windows installer . Regards, Emeka On Thu, Sep 3, 2009 at 8:07 PM, Meikel Brandmeyer wrote: > Hello Emeka, > > Am 03.09.2009 um 18:01 schrieb Emeka: > > I am still waiting for the day I could start off using vimclojure on my >> PC. Is vimclojure ready for my environment? And is it easy to install? >> > > I'm using a Windows setup at work and works without much trouble. Currently > the setup is a bit hairy on Windows due to some arbitrary limitations > imposed by the host platform. But Justin Johnson is working on Windows > installer including some launchers to start the nailgun server. > > Sincerely > Meikel > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Windows user
Hello Meikel, I am still waiting for the day I could start off using vimclojure on my PC. Is vimclojure ready for my environment? And is it easy to install? Regards, Emeka --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Searching the group archives
Another way of searching . Instead of "Search this group" use "Search Groups" , and inform google of the group you intend search and your message. Here is an example, re-find group:clojure . Regards, Emeka On Sun, Aug 30, 2009 at 12:19 PM, Emeka wrote: > Thanks, I was about asking for help. > > Regards, > Emeka > > On Sat, Aug 29, 2009 at 6:54 PM, Rich Hickey wrote: > >> >> While the "Search this group" interface seems increasingly anemic, and >> time-limited in its results, you can get an effective search on the >> group archives using the advanced search: >> >> http://groups.google.com/advanced_search?q=&; >> >> Just select google groups and put clojure as the group. >> >> Rich >> >> >> >> > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Java security code in Clojure
Sorry, I was too quick. I misunderstood your code.
Regards,
Emeka
On Mon, Aug 31, 2009 at 6:10 PM, Emeka wrote:
>
> Hello Sam,
>
> From the Java version you used created array ,byte[] encodedKey = new
> byte[(int) keyFile.length()];, but in clojure version you did (into-array
> Byte/TYPE (byte-seq stream)) , why not use make-array here.
>
> (byte-seq stream) returns list, is that the right argument for constructor
> call?
>
> Did you try this;
>
> (make-array Byte/TYPE (int (. (java.io.File. "public.der") length)))
>
> Regards,
> Emeka
> On Mon, Aug 31, 2009 at 11:19 AM, Sam Hughes
> wrote:
>
>>
>> Hey,
>>
>> I'm trying to write a Clojure security library. My first step is
>> porting some working Java code into Clojure. The Java and Clojure
>> snippets below are more or less the same, but with the Clojure code,
>> I'm getting: "java.security.InvalidKeyException: IOException: null
>> [Thrown class java.security.spec.InvalidKeySpecException]," which I
>> can't seem to replicate with the Java code.
>>
>> The goal of the code is to read in a DER file, use it to encrypt a
>> "Hello World" message, then output the encrypted message as a new
>> file.
>>
>> Neither of these snippets necessarily follow good coding standards.
>> That said, here's the working Java code snippet:
>>
>> final File keyFile = new File("public.der");
>> byte[] encodedKey = new byte[(int) keyFile.length()];
>>
>> new FileInputStream(keyFile).read(encodedKey);
>> final byte[] newEncoded = encodedKey;
>>
>> final X509EncodedKeySpec keySpec = new X509EncodedKeySpec(newEncoded);
>> KeyFactory kf = KeyFactory.getInstance("RSA");
>> PublicKey pk = kf.generatePublic(keySpec);
>>
>> Cipher rsa = Cipher.getInstance("RSA");
>> rsa.init(Cipher.ENCRYPT_MODE, pk);
>> OutputStream os = new CipherOutputStream(new FileOutputStream
>> ("encrypted.rsa"), rsa);
>>
>> Writer out = new OutputStreamWriter(os);
>> out.write("Hello World");
>> out.close();
>> os.close();
>>
>> And here's the Exception throwing Clojure code:
>>
>> (ns security
>> (:import
>> [java.io File FileInputStream IOException]
>> [java.security.spec X509EncodedKeySpec]
>> [java.security KeyFactory PublicKey
>>KeyPairGenerator NoSuchAlgorithmException KeyPair]
>> [javax.crypto KeyGenerator Cipher]))
>>
>> (defn byte-seq [rdr]
>> (let [result (byte (. rdr read))]
>>(if (= result -1)
>> (do (. rdr close) nil)
>> (lazy-seq (cons result (byte-seq rdr))
>>
>> (def stream (new FileInputStream (new File "public.der")))
>> (def byte-arr (into-array Byte/TYPE (byte-seq stream)))
>> (def pk-spec (new X509EncodedKeySpec byte-arr))
>> (def kf (. KeyFactory (getInstance "RSA")))
>> (def pk (. kf (generatePublic pk-spec))) ; exception thrown
>> here
>>
>> Does anyone have any suggestion for what could be causing the
>> exception? I'm perplexed because, right now, I'm just trying to
>> replicate Java code in Clojure -- nothing too fancy.
>>
>> Thanks a lot,
>> Sam
>>
>> >>
>>
>
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Re: Java security code in Clojure
Hello Sam,
>From the Java version you used created array ,byte[] encodedKey = new
byte[(int) keyFile.length()];, but in clojure version you did (into-array
Byte/TYPE (byte-seq stream)) , why not use make-array here.
(byte-seq stream) returns list, is that the right argument for constructor
call?
Did you try this;
(make-array Byte/TYPE (int (. (java.io.File. "public.der") length)))
Regards,
Emeka
On Mon, Aug 31, 2009 at 11:19 AM, Sam Hughes wrote:
>
> Hey,
>
> I'm trying to write a Clojure security library. My first step is
> porting some working Java code into Clojure. The Java and Clojure
> snippets below are more or less the same, but with the Clojure code,
> I'm getting: "java.security.InvalidKeyException: IOException: null
> [Thrown class java.security.spec.InvalidKeySpecException]," which I
> can't seem to replicate with the Java code.
>
> The goal of the code is to read in a DER file, use it to encrypt a
> "Hello World" message, then output the encrypted message as a new
> file.
>
> Neither of these snippets necessarily follow good coding standards.
> That said, here's the working Java code snippet:
>
> final File keyFile = new File("public.der");
> byte[] encodedKey = new byte[(int) keyFile.length()];
>
> new FileInputStream(keyFile).read(encodedKey);
> final byte[] newEncoded = encodedKey;
>
> final X509EncodedKeySpec keySpec = new X509EncodedKeySpec(newEncoded);
> KeyFactory kf = KeyFactory.getInstance("RSA");
> PublicKey pk = kf.generatePublic(keySpec);
>
> Cipher rsa = Cipher.getInstance("RSA");
> rsa.init(Cipher.ENCRYPT_MODE, pk);
> OutputStream os = new CipherOutputStream(new FileOutputStream
> ("encrypted.rsa"), rsa);
>
> Writer out = new OutputStreamWriter(os);
> out.write("Hello World");
> out.close();
> os.close();
>
> And here's the Exception throwing Clojure code:
>
> (ns security
> (:import
> [java.io File FileInputStream IOException]
> [java.security.spec X509EncodedKeySpec]
> [java.security KeyFactory PublicKey
>KeyPairGenerator NoSuchAlgorithmException KeyPair]
> [javax.crypto KeyGenerator Cipher]))
>
> (defn byte-seq [rdr]
> (let [result (byte (. rdr read))]
>(if (= result -1)
> (do (. rdr close) nil)
> (lazy-seq (cons result (byte-seq rdr))
>
> (def stream (new FileInputStream (new File "public.der")))
> (def byte-arr (into-array Byte/TYPE (byte-seq stream)))
> (def pk-spec (new X509EncodedKeySpec byte-arr))
> (def kf (. KeyFactory (getInstance "RSA")))
> (def pk (. kf (generatePublic pk-spec))) ; exception thrown
> here
>
> Does anyone have any suggestion for what could be causing the
> exception? I'm perplexed because, right now, I'm just trying to
> replicate Java code in Clojure -- nothing too fancy.
>
> Thanks a lot,
> Sam
>
> >
>
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Re: Help
Angel, (note the space between & and v) --> no clojure here... it's English... :-) > > If you write &v (without space) it's just another identifier &v. You are pretty right. However, for your case to hold that &v is another identifier, just try it out. Regards, Emeka --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Help
Hello All, I was fooling around with clojure and I found something I have not noticed before. Could someone explain it ? (defn foo [ &v] (apply + &v)) Is '&' + the identifier's name another where of making sure that the parameter must be a collection? Or is there something I am doing wrong here? To be honest, I am pretty tired. Happy Sunday! Regards, Emeka --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Searching the group archives
Thanks, I was about asking for help. Regards, Emeka On Sat, Aug 29, 2009 at 6:54 PM, Rich Hickey wrote: > > While the "Search this group" interface seems increasingly anemic, and > time-limited in its results, you can get an effective search on the > group archives using the advanced search: > > http://groups.google.com/advanced_search?q=&; > > Just select google groups and put clojure as the group. > > Rich > > > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Java STM
Peter, you will get there some day. On Fri, Aug 28, 2009 at 8:45 AM, peter veentjer wrote: > > > No. I don't want to use transactions for workflow. I don't want > > blocking transactions. I don't want read tracking. > > With multiverse it depends on the engine being used and the settings > on the transaction. And readonly transactions also don't track reads. > > > > And since Clojure is using MVCC, does it also suffer from a broken > > > serialized isolation level? > http://pveentjer.wordpress.com/2008/10/04/breaking-oracle-serializable/ > > > > Clojure doesn't promise any "serialized isolation level". It provides > > snapshot isolation, which is subject to write skew, as better > > described here: > > > > http://en.wikipedia.org/wiki/Snapshot_isolation > > > > In order to prevent write skew, Clojure provides the 'ensure' > > operation which can be used for reads to non-written refs that form > > part of the integrity promise of a transaction, without incurring that > > overhead all the time for reads that do not. I much prefer having this > > fine-grained choice. > > I'll have a look at it. > > > > > > And what kind of performance do you get with clojure? > > > > I'll let other people answer that from their experience, but only say > > that it is probably too general a question to be particularly > > meaningful. > > True. > > > Clojure's STM is part of a holistic language design where > > people will normally be programming with immutable persistent > > composite data structures. Getting a consistent view of such a data > > structure doesn't require a transaction at all, so that is much faster > > than other strategies. When 'changing' a data structure, you read it > > from the ref once and then structural changes do not involve the STM > > or refs. Store it back in the ref when done. Thus the granularity of > > transactions is coarse and the number of ref interactions involved > > small. These are not things you'll see when timing pounding an integer > > in a transactional ref in a tight loop, but matter greatly in > > practice, IMO. > > I partly agree. One of my design guidelines is that one should not > have to pay > for what is not being used. > > One of the things I'm focussing on is making the transaction > as fast as possible for any length. I'm working on a system that > advices the > creation of a transaction with the maximum number of attached objects. > I have > a transaction optimised for a single attachment (5+M transactions/ > second on a single core), > for a small number of attachments (so using an array to store attached > items to reduce object creation) > and one for a large number of attachments (so using an expensive > hashmap). > The later one also is going to get a parallel commit (so obtaining > locks/checking for > isolation problems.. and doing the write) to make effective use of the > cores and speed > up the commit of larger transactions. > > So I'm working on all levels to make it as fast as possible and > pounding > on an intref is something that helps to find a subset of problem > areas. And if something > is fast enough, people don't try to work around it.. so it also helps > to reduce complexity imho. > > But again, I think that clojure is doing a great job. You have a cool > language, > a cool stm, an active community and a lot of exposure. So you are > where I > want to be :) > > > Rich > > > PS: > > > I think that Clojure really did a great job with adding STM to the > > > language. I have been working on multiverse for almost a year, > > > and I only have an stm. With Clojure the STM is one of the many > > > features provided. > > > > > > On Mon, Jul 13, 2009 at 2:07 AM, Vagif Verdi > wrote: > > > > > > > Potentially interesting library for clojurians. Java STM > > > > > implementation:http://www.deucestm.org/ > > > > > > -- > > > > Venlig hilsen / Kind regards, > > > > Christian Vest Hansen. > > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: clojure vs scala
e, I just picked a new word 'Rogramming'? Regards, Emeka On Fri, Aug 28, 2009 at 1:30 AM, e wrote: > > > On Thu, Aug 27, 2009 at 9:57 AM, Emeka wrote: > >> e, >> >> What is inspiring in it? >> > > H from time to time, people use percent literacy as a measure of > public intellectual health, right? In that case, it's sort of obvious that > literacy is a goal. Well, I'm wondering if we need to add a 4th > fundamental to the 3 R's (Reading, Riting and 'Rithmetic) ... namely > 'Rogramming. That opens up a lot of conversation. To summarize a paragraph > that I just erase (was getting a little silly), to me Stuart's point is the > same as to say that it is not the intent of poems (or even some good movies) > to be understood completely, all at once, and right away. There are plenty > of other worthwhile things in that category, too ... like perhaps clojure. > > > >> >> Regards, >> Emeka >> >> On Thu, Aug 27, 2009 at 1:44 PM, e wrote: >> >>> On Thu, Aug 27, 2009 at 8:43 AM, Stuart Halloway < >>> stuart.hallo...@gmail.com> wrote: >>> >>>> >>>> As the author of the book, you can bet I have an opinion on the >>>> quality of the docs. :-) >>>> >>>> (1) I think the documentation for Clojure (website, Mark Volkmann's >>>> long article [1], blog posts, the book [2]) is *insanely* good, given >>>> how young the language is. But... >>>> >>>> (2) If you are coming from a mainstream business software environment, >>>> there are a ton of new ideas in Clojure. There's more to learn, so of >>>> course it is going be harder, and take longer. You won't get there >>>> just by reading one book, even if you work through all the code >>>> examples. I *love* that Rich's recommended reading list [3] has not 2, >>>> or 4, but 36 books!! Clojure stands in opposition to the "in 21 days >>>> for dummies" [4] school of thought. >>>> >>>> (3) Scala's just as hard to learn, because it too is full of ideas >>>> that are new to many developers. I would love to see the 36-book list >>>> for learning Scala, and I bet there would be significant overlap. >>>> >>>> (4) I think the Clojure docstrings are ok, but could be improved by >>>> usage examples. Rich, are you interested in patches that simply add >>>> examples to docstrings? >>>> >>>> In short: if you are the median developer, both Clojure and Scala are >>>> huge improvements over the language you are using right now. But you >>>> won't be effective in either one of them tomorrow: the learning curve >>>> is not 1, but 5-10 books. >>>> >>>> So let's raise the bar. In the world I want to live in, programmers >>>> above the novice level would understand the ideas in both Clojure and >>>> Scala. Learn both. :-) >>>> >>>> Cheers, >>>> Stu >>>> >>>> [1] http://java.ociweb.com/mark/clojure/article.html >>>> [2] http://www.pragprog.com/titles/shcloj/programming-clojure >>>> [3] http://tinyurl.com/clojure-bookshelf >>>> [4] http://norvig.com/21-days.html >>>> >>> >>> awesome post. Inspiring. >>> >>>> >>>> >>>> > >>>> > I think there are a lot of people who need to choose between Clojure >>>> > and Scala to study as a "new" language. I must say that both are bad: >>>> > * Clojure doc is hard to understand. >>>> > * Scala grammar is complicated. >>>> > >>>> > I prefer Clojure. I think Clojure feature at this time is OK, thus the >>>> > decisive point to draw people to Clojure is doc. I wonder if the doc >>>> > at this time is obvious for LISP people, but comming from C/C++, Java, >>>> > Ruby, and Erlang (Erlang doc is bad, but it is paradise compared to >>>> > that of Clojure :D) and even after reading the Clojure book, I must >>>> > say that I can't understand 99% of the doc of both clojure and >>>> > clojure- >>>> > contrib. >>>> > >>>> > For example, what does the following mean? >>>> > - >>>> > (-> x form) >>>> > (-> x form & more) >>>> > Macro >>>> > Th
Re: clojure vs scala
e, What is inspiring in it? Regards, Emeka On Thu, Aug 27, 2009 at 1:44 PM, e wrote: > On Thu, Aug 27, 2009 at 8:43 AM, Stuart Halloway < > stuart.hallo...@gmail.com> wrote: > >> >> As the author of the book, you can bet I have an opinion on the >> quality of the docs. :-) >> >> (1) I think the documentation for Clojure (website, Mark Volkmann's >> long article [1], blog posts, the book [2]) is *insanely* good, given >> how young the language is. But... >> >> (2) If you are coming from a mainstream business software environment, >> there are a ton of new ideas in Clojure. There's more to learn, so of >> course it is going be harder, and take longer. You won't get there >> just by reading one book, even if you work through all the code >> examples. I *love* that Rich's recommended reading list [3] has not 2, >> or 4, but 36 books!! Clojure stands in opposition to the "in 21 days >> for dummies" [4] school of thought. >> >> (3) Scala's just as hard to learn, because it too is full of ideas >> that are new to many developers. I would love to see the 36-book list >> for learning Scala, and I bet there would be significant overlap. >> >> (4) I think the Clojure docstrings are ok, but could be improved by >> usage examples. Rich, are you interested in patches that simply add >> examples to docstrings? >> >> In short: if you are the median developer, both Clojure and Scala are >> huge improvements over the language you are using right now. But you >> won't be effective in either one of them tomorrow: the learning curve >> is not 1, but 5-10 books. >> >> So let's raise the bar. In the world I want to live in, programmers >> above the novice level would understand the ideas in both Clojure and >> Scala. Learn both. :-) >> >> Cheers, >> Stu >> >> [1] http://java.ociweb.com/mark/clojure/article.html >> [2] http://www.pragprog.com/titles/shcloj/programming-clojure >> [3] http://tinyurl.com/clojure-bookshelf >> [4] http://norvig.com/21-days.html >> > > awesome post. Inspiring. > >> >> >> > >> > I think there are a lot of people who need to choose between Clojure >> > and Scala to study as a "new" language. I must say that both are bad: >> > * Clojure doc is hard to understand. >> > * Scala grammar is complicated. >> > >> > I prefer Clojure. I think Clojure feature at this time is OK, thus the >> > decisive point to draw people to Clojure is doc. I wonder if the doc >> > at this time is obvious for LISP people, but comming from C/C++, Java, >> > Ruby, and Erlang (Erlang doc is bad, but it is paradise compared to >> > that of Clojure :D) and even after reading the Clojure book, I must >> > say that I can't understand 99% of the doc of both clojure and >> > clojure- >> > contrib. >> > >> > For example, what does the following mean? >> > - >> > (-> x form) >> > (-> x form & more) >> > Macro >> > Threads the expr through the forms. Inserts x as the second item in >> > the first form, making a list of it if it is not a list already. If >> > there are more forms, inserts the first form as the second item in >> > second form, etc. >> > - >> > >> > My wish: There are easy-to-understand examples in API doc. >> > >> > Rails is easy to use largely because there are examples in doc of >> > every API function. >> > >> > >> > On Aug 26, 12:37 pm, Alan Busby wrote: >> >> On Wed, Aug 26, 2009 at 5:43 AM, npowell >> >> wrote: >> >> >> >>> I mean, I didn't think the article was terribly in depth, but a >> >>> real, >> >>> evenhanded comparison would be enlightening. >> >> >> >> Reducing it further, I'd be interested just to hear more about the >> >> contrast >> >> of static typing versus macros. Which is more beneficial for >> >> different >> >> situations and why? >> > > >> >> >> >> > > > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: A little help needed in understnding anonymous functions
(defn foo2 [n] (let [r (ref n)] #(dosync (alter r + %) @r))) Something went wrong, I am resending the code. Regards, Emeka --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: A little help needed in understnding anonymous functions
On Wed, Aug 26, 2009 at 6:40 PM, Sourav wrote: > > Hi, > > I'm new to clojure and came from a Lisp background. While learning I > clojure I came accross the two different ways of creating anonymous > functions ((fn ...) and #(...)). I tried to construct the accumulator > function in clojure using these forms and this is what I wrote (this > might seem naive but I'm just a beginner :) > > 1. > > (defn foo [n] > (let [r (ref n)] >(fn [i] > (dosync > (alter r + i) @r > And it works fine: > > user> (def f (foo 10)) > #'user/f > user> (f 1) > 11 > user> (f 1) > 12 > > 2. > (defn foo2 [n] > (let [r (ref n)] >#((dosync >(alter r + %) @r > (defn foo2 [n] (let [r (ref n)] #(dosync (alter r + %) @r Try the above. The difference between #() and (fn ...) was not the root of your problem. You had an extra paren before dosync. --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
clojure vs scala
Hello All, This sounds great! http://codemonkeyism.com/clojure-scala-part-2/ Regards, Emeka --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Basic hadoop example in clojure.
RD,I don't know about the gen-class, to be sincere with you I have not used. But clojure follows a standard and natural sequence if you look closely. What you used in your former code were referring to different class path and the paths were not even defined. The below is from clojure.org A stand-alone gen-class <http://clojure.org/API#gen-class> facility is provided to create named classes for direct use as Java classes, with facilities for: - Naming the generated class http://clojure.org/compilation So were do you want clojure to place the generated class. My guess is within the same folder as your 'ns or need near. Now I hope you have seen why you need that change. I invite comments from experts here if I have strayed. Regards, Emeka On Mon, Jul 27, 2009 at 9:47 AM, RD wrote: > Hi Stuart, > Thanks for the link > Relating to the hadoop code I posted above, I got it to compile by > putting the code under a namespace and changing > the class names appropriately , but still I have no clue as to why the code > didn't work without the namespace. > > I'll defenitely check the link though, thks. > > regards, > rdsr > > > Here's the code with the modification > > (ns com.rdsr.maxt > (:gen-class) > (:import [org.apache.hadoop.io IntWritable Text] >[org.apache.hadoop.fs Path] >[org.apache.hadoop.mapred > JobConf JobClient > FileInputFormat FileOutputFormat > Mapper Reducer MapReduceBase]) > (:use [clojure.contrib.str-utils :only (re-split)])) > > (gen-class > :name com.rdsr.mapper > :extends org.apache.hadoop.mapred.MapReduceBase > :implements [org.apache.hadoop.mapred.Mapper] > :prefix "m-") > > (defn m-map [this key value output-collector reporter] > (let [line (str value) > year (subs line 15 19) > air-temperature (if (= (nth line 87) \+) > (Integer/parseInt (subs line 88 92)) > (Integer/parseInt (subs line 87 92))) > quality (subs line 92 93)] > (if (and (not (= air-temperature )) > (re-matches #"[01459]" quality)) > (.collect output-collector (Text. year) (IntWritable. > air-temperature) > > (gen-class > :name com.rdsr.reducer > :extends org.apache.hadoop.mapred.MapReduceBase > :implements [org.apache.hadoop.mapred.Reducer] > :prefix "r-") > > (defn r-reduce [this key values output-collector reporter] > (let [values-seq (iterator-seq values)] > (.collect output-collector key > (apply max (map (fn [n] (.get n)) values-seq) > > (defn -main [& args] > (let [conf (JobConf. com.rdsr.maxt)] > (doto conf > (.setJobName "Max temperature") > (.setMapperClass com.rdsr.mapper) > (.setReducerClass com.rdsr.reducer) > (.setOutputKeyClass Text) > (.setOutputValueClass IntWritable)) > (FileInputFormat/addInputPath conf (Path. (first args))) > (FileOutputFormat/setOutputPath conf (Path. (second args))) > (JobClient/runJob conf))) > > (compile 'com.rdsr.maxt) > > > On Mon, Jul 27, 2009 at 9:46 PM, Stuart Sierra < > the.stuart.sie...@gmail.com> wrote: > >> >> Hi rdsr, >> >> The problem is that you're trying to use the "maxtemperature" as a >> class name before it's finished compiling. To work around that, use >> (Class/forName "maxtemperature") instead. >> >> You can also see my (very task-specific) Hadoop/Clojure integration at >> <http://tinyurl.com/mqv2os> >> and <http://tinyurl.com/lznlg2>. >> >> -SS >> >> >> On Jul 27, 4:55 am, RD wrote: >> > Hi all, >> > I'm having trouble converting the basic hadoop example to clojure. >> > Here's my code. >> > >> > (ns maxtemperature >> > (:gen-class) >> > (:import [org.apache.hadoop.io IntWritable Text] >> >[org.apache.hadoop.mapred >> > JobConf JobClient >> > FileInputFormat FileOutputFormat >> > Mapper Reducer MapReduceBase]) >> > (:use [clojure.contrib.str-utils :only (re-split)])) >> > >> > (gen-class >> > :name mapper >> > :extends org.apache.hadoop.mapred.MapReduceBase >> > :implements [org.apache.hadoop.mapred.Mapper] >> > :prefix "m-") >> > >> > (defn m-map [this key value output-collector reporter] >> > (let [line (str value) >> > year (subs line 15 19) >> > air-temperat
openlg
Hello All, ztellman, I would like to use git://github.com/ztellman/penumbra.git , however I won't mind knowing the owner, too. Regards, Emeka --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Mysterious ClassFormatError after simple code change.
(defn- subexpressions-of-sum** [[n p] terms] (let-print [sum (cons '+ (map #(factor-term % n p) terms)) prod (rest (make-product* n p))] (cons sum (map #(cons '* (cons sum (rest %))) (concat prod (subexpressions-of-product prod)) I look at the above, and something stupid just entered into my thought. What happened when this situation occurs (cons sum ())? I hope that's not possible with your code. Regards, Emeka On Sun, Jul 5, 2009 at 6:01 AM, John Harrop wrote: > > I had this: > > (defn- subexpressions-of-sum** [[n p] terms] > (let-print [sum (cons '+ (map #(factor-term % n p) terms)) >prod (rest (make-product* n p))] >(concat [sum] (subexpressions-of-product (cons sum prod) > > in a source file with other definitions. Load-file worked. I then > changed it to this: > > (defn- subexpressions-of-sum** [[n p] terms] > (let-print [sum (cons '+ (map #(factor-term % n p) terms)) >prod (rest (make-product* n p))] >(cons sum > (map #(cons '* (cons sum (rest %))) >(concat prod (subexpressions-of-product prod)) > > and got: > > # 32 in class file com/mycompany/myfile$eval__14598 (NO_SOURCE_FILE:0)> > > when I tried to do a load-file. > > That function definition was the ONLY thing I changed, but I'm at a > loss to find any kind of error in it. Delimiters balance, all of the > referenced functions exist, basically there's nothing wrong. > > The full exception trace, which required evaluating (.printStackTrace > (.getCause *e)) at the repl, is: > > java.lang.ClassFormatError: Unknown constant tag 32 in class file > com/mycompany/myfile$eval__14598 >at java.lang.ClassLoader.defineClass1(Native Method) >at java.lang.ClassLoader.defineClass(ClassLoader.java:621) >at java.lang.ClassLoader.defineClass(ClassLoader.java:466) >at > clojure.lang.DynamicClassLoader.defineClass(DynamicClassLoader.java:42) >at clojure.lang.Compiler$FnExpr.getCompiledClass(Compiler.java:3417) >at clojure.lang.Compiler$FnExpr.eval(Compiler.java:3428) >at clojure.lang.Compiler.eval(Compiler.java:4531) >at clojure.core$eval__3990.invoke(core.clj:1728) >at > clojure.main$repl__5813$read_eval_print__5825.invoke(main.clj:176) >at clojure.main$repl__5813.doInvoke(main.clj:193) >at clojure.lang.RestFn.invoke(RestFn.java:548) >at > org.enclojure.repl.main$create_clojure_repl__53$repl_thread_fn__55.invoke(main.clj:96) >at clojure.lang.AFn.run(AFn.java:37) >at java.lang.Thread.run(Thread.java:619) > > It does not point to any line of my source file. > > Perhaps the rewritten version of the function provokes a compiler bug? > If there is a known bug that would cause this, let me know of the > known workaround. If there is an error in the second version of my > function, let me know. (It has intentionally different semantics from > the first version, so that's not an error in and of itself.) > > > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: *command-line-args*
Steve, Could this be done such that % java -cp /sq/ext/clojure/clojure.jar clojure.main demo.clj foo bar baz the highlighted part won't the there? But would be ''attached'' behind the scene . Regards, Emeka On Thu, Jul 2, 2009 at 6:17 PM, Stephen C. Gilardi wrote: > > On Jul 2, 2009, at 2:00 PM, Mark Volkmann wrote: > > I run it with "clj demo.clj foo bar baz" and get this output: >> >> clojure.lang.ArraySeq >> 2 >> >> I get the same output with "clj demo.clj -- foo bar baz". >> >> Why doesn't it output 3? >> > > That depends on your definition of clj. > > Here's what I get without using a launcher script: > > % java -cp /sq/ext/clojure/clojure.jar clojure.main demo.clj foo bar baz > clojure.lang.ArraySeq > 3 > (foo bar baz) > > (I added (println *command-line-args*) to my demo.clj. You might get some > good info by adding it yours as well.) > > --Steve > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Article on Dispatch
Thanks, more of it. Emeka On Mon, Jun 29, 2009 at 12:31 AM, Daniel Jomphe wrote: > > I think the following article I wrote may help properly understanding > dispatch. I submit here for your pleasure/review. > > First paragraph: > > "I believe multiple dispatch is known to be hard to understand. When I > first read about it, for some reason, it took me quite a lot of > thinking before I really understood it all. Now that I understand it > very well, I find it odd that it felt so challenging at the time. For > this reason, I wanted to try putting an end to this nonsense. There’s > probably other articles out there that explain it very well today. In > any case, here’s my take. As usual with me, it’s pretty wordy: I like > to surround that kind of knowledge with lots of useful observations." > > > http://danieljomphe.github.com/2009/06/18/understanding-function-dispatch.html > > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Binary Tree
(defn depth [tree] (if (nil? tree) 0 (+ 1 (max (depth (left tree)) (depth (right tree) This looks close to what I need. Let me see if I can't get my head around it. Regards, Emeka On Tue, Jun 30, 2009 at 8:28 AM, Daniel Lyons wrote: > > On Jun 30, 2009, at 1:05 AM, Emeka wrote: > > Hello All, > > I have a BinaryTree Nodes that I want to resolve it's depth and the > BinaryTree may be unbalanced. How do I do this? Can't just figure it out on > my own? > It is in the form of vector of vectors, and from one cell of any vector I > can move to the next row however the column index has to be either > increased by one or decreased by one(and the new cell is empty). > > > If you had a balanced binary tree, you could just take log_2(N) where N is > the number of nodes. :) But since you don't you have to do something like > get the max depth of the left branch and the right branch and add one to it > (pseudocode): > > (defn depth [tree] > (if (nil? tree) 0 > (+ 1 (max (depth (left tree)) (depth (right tree) > > If you're storing this binary tree in an array, I vaguely remember doing > something like storing the left node at 2*i where i is the index of the > current node, and the right node at 2*i+1. I'm not sure how you'd do that > with an unbalanced tree unless you did something like have nils in your > array. If you did that, you just need to take log_2(I) where I is the index > of the last non-nil value in the array. > > I'm not sure exactly what data structure you're working with to make your > binary tree though. Can you send an example of the tree you have as vectors? > > Are you also trying to compute whether or not it's unbalanced or is that > just a given that it might be? > > — > Daniel Lyons > > > > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Binary Tree
Hello All, I have a BinaryTree Nodes that I want to resolve it's depth and the BinaryTree may be unbalanced. How do I do this? Can't just figure it out on my own? It is in the form of vector of vectors, and from one cell of any vector I can move to the next row however the column index has to be either increased by one or decreased by one(and the new cell is empty). Regards, Emeka --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Trying to use lazy-seq for the first time, failing.
Thanks, however I have that already :) Regards, Emeka On Mon, Jun 29, 2009 at 2:36 PM, _hrrld wrote: > > On Jun 29, 1:15 am, Emeka wrote: > > Harold, > > > > Do you have any material on Factor? I won't going through it. > > Emeka, > > Many of these links are relevant: > http://www.google.com/search?q=factor+language > > Regards, > -Harold > > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Trying to use lazy-seq for the first time, failing.
Harold, Do you have any material on Factor? I won't going through it. Regards, Emeka On Sat, Jun 27, 2009 at 12:23 AM, _hrrld wrote: > > Hi, > > I'm trying to use lazy-seq to implement a cool piece of functionality > I saw in the Factor programming language. Here is the documentation > for that functionality: > http://docs.factorcode.org/content/word-produce,sequences.html > > I think a lazy version of Factor's "produce" word would be super- > powerful for some of the things I'm working on. > > This is the first time I've tried to create my own lazy sequence, so > don't laugh. > > Here is my attempt: > http://gist.github.com/136825 > > For some reason, the lazy sequence that is returned is always empty > (?) or at least seems that way. > > Am I doing something silly? Or perhaps I've misunderstood lazy-seq's > operation. > > Thanks in advance for any advice, > -Harold > > > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: A website written using Clojure.
Stuart Sierra, I want to use StringTemplate, could you give me a lead? Emeka On Thu, Jun 25, 2009 at 9:31 PM, Stuart Sierra wrote: > > On Jun 25, 3:59 pm, Berlin Brown wrote: > > But does anyone have a problem with Lisp/S-Expressions to HTML/XHtml, > > especially for the entire document. What is wrong with using some > > form of templating system. > > Yes, I'm partial to StringTemplate, a Java template framework. Very > simple, like a functional language itself. > http://www.stringtemplate.org/ > > -SS > > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: A website written using Clojure.
CuppoJava,
I was referring to the map data structure {'html "html"..} and not the
other map.
Regards,
Emeka
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Re: A website written using Clojure.
CuppoJava, Did you try prxml? May be it can be of help. Regards, Emeka --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: A website written using Clojure.
That's cool. (doseq [[name tag] [['html "html"] ['head "head"] ['style "style"] ['title "title"] ['body "body"] ['table "table"] ['row "tr"] ['col "td"] ['span "span"] ['h1 "h1"]]] Why not use map here? (eval `(defblockfn ~name [block#] (html_tag* ~tag nil block#))) (eval `(defblockfn ~(symbol (str name "_with")) [attributes# block#] (html_tag* ~tag attributes# block# See if you can simplify the above code. Regards, Emeka On Thu, Jun 25, 2009 at 5:46 PM, CuppoJava wrote: > > Hey guys, > I was a little tired of working on what I am supposed to be working > on, and decided to take a break and create a website. I decided to use > Clojure, and to my surprise, it only took a day and less than 3 pages > of code. > > members.shaw.ca/patrickli > > It only has a single article right now, under Technical, that talks > about how I programmed the website. It's still a rough work (I haven't > written anything substantial for a long time), but it'd be nice to > hear some thoughts. > > -Patrick > > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: defn memory question
>From Steve's post
Symbol objects are subject to garbage collection, but the "namespace" and
"name" strings that identify them are not. Those strings are "interned" via
the "intern" method on java.lang.String. Once a String is interned, there
exists a single canonical String object that represents it throughout the
remaining lifetime the JVM instance. Any two Symbols of the same namespace
and name will reference those canonical namespace and name strings and will
thus have identical namespaces and names.
Not interning the Symbols themselves turns out to be important in
Clojure because it allows two Symbols with identical namespace and name to
have different metadata.
Keyword objects are interned by Clojure and are not garbage collected.
When a Keyword is created, it's placed in a ConcurrentHashMap that maps a
Symbol of the same name and namespace to the Keyword object. In a given JVM
instance, there is at most one Keyword object with a given name and
namespace. Whenever the reader reads a Keyword's text representation, it
returns the unique Keyword object associated with it.
Here's some repl playing to support this:
user=> (identical? 'a/b 'a/b)
false
user=> (identical? (name 'a/b) (name 'a/b))
true
user=> (identical? (namespace 'a/b) (namespace 'a/b))
true
user=> (= (quote #^{:tagged true} a/b) (quote a/b))
true
user=> (= (meta (quote #^{:tagged true} a/b)) (meta (quote
a/b)))
false
user=> (identical? :a/b :a/b)
true
On Thu, Jun 25, 2009 at 10:25 AM, Rich Claxton wrote:
>
> Hello I have just started learning Clojure and functional programming,
> quick question, what happens internally when I do a defn, does this
> create the byte code, or a ref to the function which is stored, as it
> does actually create a function object, I was just wondering about
> memory and GC issues.
>
> Cheers Richard.
>
> >
>
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Re: Foreclojure
accounting software in Clojure? Which area of accounting will it cover? Emeka On Thu, Jun 25, 2009 at 3:41 AM, fft1976 wrote: > > I know some of you are searching for names for your projects. I just > wanted to say that "Foreclojure" is taken! This will be an open-source > (but not GPL) accounting software in Clojure. Stay tuned. > > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Small question: Best way to create a map with vector vals
Have you tried zipmap?
Emeka
On Tue, Jun 23, 2009 at 10:09 PM, samppi wrote:
>
> The idiom (into {} coll-of-entries) is often used to create a map from
> a collection of entries or two-sized vectors. But what if I want to do
> something like this:
>
> (mystery-fn [[:a 1] [:b 3] [:b 5] [:c 1]]) ; returns {:a [1], :b [3
> 5], :c [1]})
>
> The only way I can think of doing this is with a complex loop
> construction. But can mystery-fn be built without resorting to that?
> What would be the best way?
>
> >
>
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Re: macroexpand question
kedu arasof I don't know why you should go for macro here, an ordinary function can do it. Emeka On Tue, Jun 23, 2009 at 12:24 AM, arasoft wrote: > > I just wrote my first practice macro, first without and then with > syntax quoting: > > (defmacro take-until1 [function sq] > (list 'take-while (list 'fn (vector 'x) (list 'not (list function > 'x))) sq)) > > (defmacro take-until2 [function sq] > `(take-while (fn [x#] (not (~function x#))) ~sq)) > > Both seem to work, but macroexpand shows different formats: > > (macroexpand '(take-until1 #(> % 10) (iterate inc 1))) > -> (take-while (fn [x] (not ((fn* [p1__502] (> p1__502 10)) x))) > (iterate inc 1)) > > (macroexpand '(take-until2 #(> % 10) (iterate inc 1))) > (clojure.core/take-while (clojure.core/fn [x__405__auto__] > (clojure.core/not ((fn* [p1__506] (> p1__506 10)) x__405__auto__))) > (iterate inc 1)) > > While I prefer the syntax of macro 2, I like the expand format of > macro 1. > Is there any way to get the best of both worlds? > > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Shouldn't c.l.Namespace implement c.l.Named?
kedu pmf What about this (str *ns*)? I remember reading it from chouser's post. Regards, Emeka --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: javafx
Kedu CuppoJava, Join this class ♫ javafxprogramm...@googlegroups.com And learn Fx. I was there for a few days before I drifted. Regards, Emeka On Sat, Jun 20, 2009 at 4:51 PM, CuppoJava wrote: > > I'm still not very clear about what JavaFX actually is and what's its > relation to Java. Do you know of any links that explain it clearly? > -Patrick > > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Another Clojure Box
Darmac, I use Scite Just edited it in order to run Clojure Repl(help help from this group). That's not great, it is ugly. I would like to use yours if it is as simple as Scite editor and pretty easy to install. Regards, Emeka --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Clojure equivalent to Ruby's ERB
markgunnels, Have you used clojure and StringTemplate to do something? If so, I would like to tap your knowledge there. Regards, Emeka On Sun, Jun 14, 2009 at 1:36 PM, markgunnels wrote: > > I just wanted to report back that StringTemplate proved to be the > perfect solution. > > I also wanted to recommend Terrence Parr's (the creator and ANTLR and > StringTemplate) new book Language Design Patterns from The Pragmatic > Programmers for anyone doing parsing and code generation. It is an > excellent introduction to the subject. > > On May 27, 6:02 pm, Stuart Sierra wrote: > > On May 26, 10:47 pm,markgunnels wrote: > > > > > Hopefully this doesn't get me booed off the message board but is there > > > a Clojure equivalent to Ruby's ERB? I'm try to use Clojure to perform > > > code generation > > > > I've had success with StringTemplate. Very functional design, easy to > > call from Clojure. And it's designed for code generation (the ANTLR > > parser generator). > > > > -Stuart Sierra > > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Performance Penalty Converting from Java Code
kedu Travis, (defn base26 [ n] (let [seed-string "" s (new StringBuilder seed-string)] (loop [ pos (- (count seed-string) 1) x n] (if (and (> pos 0)(> x 0)) (do (. s setCharAt pos (char (+ (int \a) (mod x 26 (recur (- pos 1) (/ x 26) (. s toString))) (doseq [i (range (Math/pow 26 4))] (base26 i)) Try the above. Emeka --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: breaking early from a "tight loop"
kedu Wrexsoul user=> (count-more-than? 0 ()) true (defn count-more-than? [n xs] (if (not (seq xs)) (or (zero? n) (recur (dec n) (rest xs) I'm afraid your code didn't return true for me. Just look at your code, (seq '()) will always give nil, so your code will return nil and not true. To get true from your code I guess the (seq xs) should be changed to (not (seq xs)). Or am I missing something? Emeka On Sat, Jun 13, 2009 at 6:02 PM, Wrexsoul wrote: > > On Jun 12, 9:44 pm, James Reeves wrote: > > (defn count-more-than? [n xs] > > (or (zero? n) > > (if (seq xs) > > (recur (dec n) (rest xs) > > > > (defn interesting? [pixels c] > > (count-more-than? c (filter in-interval? pixels))) > > Nice, but > > user=> (count-more-than? 0 ()) > true > > (defn count-more-than? [n xs] > (if (seq xs) >(or (zero? n) > (recur (dec n) (rest xs) > > seems to work. :) > > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Macro Design - by example
Meikel, Could I be allowed to join your online class:) Regards, Emeka --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Help with filechooser
Sorry for the noise, I was too quick. On Tue, Jun 9, 2009 at 3:46 PM, Emeka wrote: > Hello All, > > (add-item-action ost-item (do > (.showOpenDialog file-chooser frame) > (let [file (.getSelectedFile file-chooser)] > (println "file" file > > > When I tried the above on windows box it prints file # C:\clojure\roobot.txt>. But what I want is "file C:\clojure\roobot.txt". > > Regards, > Emeka > > > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Help with filechooser
Hello All, (add-item-action ost-item (do (.showOpenDialog file-chooser frame) (let [file (.getSelectedFile file-chooser)] (println "file" file When I tried the above on windows box it prints file #. But what I want is "file C:\clojure\roobot.txt". Regards, Emeka --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: filechooser
- line 35 looks wrong. What does Dispatch/put return Thanks so pointing that out. I have to out windows guys then. Regards, Emeka --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
filechooser
Hello Meikel, I have not been able to resolve this issue. As I mentioned in another thread, I want to use filechooser to select the excel file. My code is in this link http://friendpaste.com/wmX89ywgPhdN5hvVBEAbg Regards, Emeka --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: VimClojure v2.1.1 is released
Thanks. I will wait. Regards, Emeka On Mon, Jun 8, 2009 at 5:05 PM, Meikel Brandmeyer wrote: > Hi, > > Am 08.06.2009 um 09:15 schrieb Emeka: > > Sure, I sent a private mail because I didn't want to increase noise in is >> group. I used the mail address you left on vimclojure site to reach you. >> > > Ok. I'm sorry. It must have been stuck in the spam filter. > I searched my mails, but only found the question about > Jacob and Excel. > > I just learned about user.home. So I can simplify >>> also the .vim installation of the plugin. >>> >>> >> Beautiful, when is it coming out? >> > > Obviously soon... -.- I introduced more bugs than > I fixed with this release. I will iron the bigger ones > and will do a 2.1.2 soon For that I will throw > another eye on the build process. > > Sincerely > Meikel > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: VimClojure v2.1.1 is released
Sure, I sent a private mail because I didn't want to increase noise in is group. I used the mail address you left on vimclojure site to reach you. I just learned about user.home. So I can simplify also the .vim installation of the plugin. Beautiful, when is it coming out? Emeka > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: VimClojure v2.1.1 is released
If you just want to get started with Clojure, use a simple text editor of your liking and a repl running in the shell/command prompt window. Well, that's what I have done. Now I am looking for something else. And because I have flirted with vi before, and I am somehow thinking that learning vim would be a great experience :). But I am not yet able to get vimclojure kicking. That's why I have been appealing for help since. And it took Meikel three weeks to make out time to talk to me. That shows that vim learning curve is indeed steep! Regards, Emeka --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: VimClojure v2.1.1 is released
This is probably the global _vimrc installed by Vim I think as much, vim needs this file to run. If you installed Vim as an administrator I always work as administrator. I will create that file and now what and what am I going to add to it. Regards, Emeka O On Sat, Jun 6, 2009 at 4:03 PM, Meikel Brandmeyer wrote: > Hi, > > Am 06.06.2009 um 17:47 schrieb Emeka: > > Then it is pretty obvious that I have erred again. >> C:\Program files\Vim\_vimrc That's where I found that file. >> > > This is probably the global _vimrc installed by Vim. > You should first try a _vimrc in your home directory. > Just create it if it doesn't exist. If you installed Vim as > an administrator and now work as a "normal" user > that might explain, why you are not allowed to edit > the file. > > Sincerely > Meikel > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: VimClojure v2.1.1 is released
Then it is pretty obvious that I have erred again. C:\Program files\Vim\_vimrc That's where I found that file. Regards, Emeka --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: VimClojure v2.1.1 is released
C:\Users\rmicro\.viminfo That's what I found. Regards, Emeka --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: VimClojure v2.1.1 is released
Do you edit the correct _vimrc? I found only one file bearing that name. Are you referring to other files? Regards, Emeka > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: VimClojure v2.1.1 is released
Meikel, I would like to use vimclojure and I have even installed all the needed applications, however I am still not able to use it. I tried to edit _vimrc but was told that it is a readonly file(this happened when I used vim to edit it). When I used other editors, it does not prompt readonly, however the message(I added) is not saved to the file either. I was able to get the NGServer up. Please assist me in it figuring out why I can't edit _vimrc. Regards, Emeka --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: What is wrong with my code
Dan and Tim, This gives you the link to the whole code. http://friendpaste.com/C3xbF1r3F3Mehnn8CCBUm. It is still not cleaned..pretty ugly, I am ashamed to show it off at all :) Regards, Emeka On Mon, Jun 1, 2009 at 7:50 AM, Timothy Pratley wrote: > > I agree, chang is most likely not being passed a ref, specifically the > part that does: > row-dev (eval (get-next-row inc (first val))) > (chang row-dev keyword-dev-right (@alon key)) > Looks to me like row-dev is not a ref, but I can't tell for sure! > > > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
What is wrong with my code
Hello All (defn chang[f key hj] (dosync (ref-set f (assoc @f key hj (defn proceed-now-right [alon key] (let [val (extract-num alon key) row-dev (eval (get-next-row inc (first val))) keyword-dev-right (get-key inc (second val)) cell-empty-right (check-cell-empty? keyword-dev-right row-dev)] (if cell-empty-right (do (chang row-dev keyword-dev-right (@alon key)) (chang alon key \space)) (println "can't do this" I found that each time I try form proceed-now-right I get error when IF is true. Why is it so? The function chang works on it own... Regards, Emeka --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
