Re: 'connection reset by peer' when connecting to socket
Hi On 2 September 2012 02:02, larry google groups lawrencecloj...@gmail.com wrote: This is probably more of a socket and network question than a Clojure question. I am learning Clojure and wanted to serve a web page through a simple app, mostly to teach myself how to put together such an app in Clojure. I grabbed the page on Wikipedia about mitochondria, and I compiled my app with that bundled in as a static resource. I figured I would serve that, it is biggest enough to offer a real test. On my local machine, everything works great. I can run: lein compile lein uberjar java -jar serve-pages-from-memory-1.0-standalone.jar 9000 This gets it running on my Mac. If I then look at localhost:9000 in a browser, I see the whole page. Everything seems to be working perfectly. I have 2 servers in the Rackspace cloud, and I wanted to run this app on one and call it from another. So I upload the app to one server and then I ssh to the other server and I call it using wget. At this point problems start. wget has to call the page many times. The first several times it tries to call, it gets Connection reset by peer. Only on the 6th try does wget get the whole document, successfully. This is the output: wget -O tma.html --force-html http://www.tailormadeanswers.com:9000/ --2012-09-01 19:52:54-- http://www.tailormadeanswers.com:9000/ Resolving www.tailormadeanswers.com... 184.106.135.172 Connecting to www.tailormadeanswers.com|184.106.135.172|:9000... connected. HTTP request sent, awaiting response... 200 OK Length: 515592 (504K) [text/html] Saving to: `tma.html' 89% [= ] 458,878 --.-K/s in 0.04s 2012-09-01 19:52:54 (11.1 MB/s) - Read error at byte 458878/515592 (Connection reset by peer). Retrying. [...] --2012-09-01 19:53:09-- (try: 6) http://www.tailormadeanswers.com:9000/ Connecting to www.tailormadeanswers.com|184.106.135.172|:9000... connected. HTTP request sent, awaiting response... 200 OK Length: 515592 (504K) [text/html] Saving to: `tma.html' 100%[===] 515,592 --.-K/s in 0.04s 2012-09-01 19:53:09 (12.5 MB/s) - `tma.html' saved [515592/515592] I am confused by a number of things here. The document from Wikipedia is 500k, but wget seems to imply that it got 10.6 megs? Where did you get that from? Wget says Read error at byte 458878/515592 or saved [515592/515592], so it clearly is expecting the resource to be 515592 bytes. Since your server doesn't support getting part of the resource, wget can't ask for just the parts it hasn't got yet. It has to download the whole thing again if it fails. I am brainstorming a few things that might be wrong here: the response is too slow? some kind of multi-threading is needed to respond to the request in a timely manner? I'm guessing the server closes the socket before the client has received the whole response, but I'm not sure. You do have the flush in there, so I'm not sure what else would be needed. Any suggestions? This whole app is only 40 lines of code, and this is the important part: (defn serve-page [output] (let [content-length (count @parsed-page)] (. output println HTTP/1.1 200 OK) (. output println Content-Type: text/html; charset=UTF-8) (. output println Connection: close) (. output println (str Content-Length: content-length)) (. output println \r\n) (. output println @parsed-page) (. output flush) (. output close))) (defn parse-buffer [ everything-else] (with-open [] (.toString (reduce #(.append %1 %2) (StringBuffer.) (line-seq page-buffer) (defn listen-and-respond [server-socket service] (let [client (. server-socket accept) output (PrintWriter. (. client getOutputStream)) ] (service output))) (defn run-server [port] (let [server-socket (ServerSocket. port)] (while (not (. server-socket isClosed)) (listen-and-respond server-socket serve-page (defn -main [ args] (let [port (Integer/parseInt (first args))] (swap! parsed-page parse-buffer) (println Server is starting) (println port: port) (run-server port))) Any suggestions about what might be wrong? -- Michael Wood esiot...@gmail.com -- 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
screencast corruption
Hi! I just wanted to watch this screencast (Clojure Sequences) as I really need that little table which compares C#, Java and Clojure sequences. However the video on this link seems to be like 5 seconds long instead of more than an hour. Can you fix it? Or do you have the slides somewhere? http://blip.tv/clojure/clojure-sequences-740581 Thanks, Andrew -- 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
IPersistentStack semantics and PersistentQueue
Hi all, Does IPersistentStack have defined stack semantics? I'm confused because IPersistentStack defines peek and pop and (via IPersistentCollection) conj. I had previously expected that peek and pop would remove from the same end that conj adds to, as happens with lists and vectors, in order to get last-in-first-out (LIFO) semantics. I was therefore very surprised to discover that PersistentQueue implements IPersistentStack, but with queue semantics instead! ie peek and pop operate at the left, while conj operates at the right. Why does PersistentQueue implement IPersistentStack? What does IPersistentStack mean, if an implementor doesn't actually have to define stack semantics? Is this by design or is it just an accident of PersistentQueue implementing IPersistentList which in turn implements IPersistentStack? Is it something which would just be too awkward to work around? I notice also that Agent's ActionQueue has an IPersistentStack q field which holds a PersistentQueue, which indicates that someone at least is comfortable with this relationship. Does this indicate that IPersistentStack's semantics simply mean a collection which can be added to and removed from, in no particular order? Is IPersistentStack the best name to describe this? 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
Re: screencast corruption
Confirmed. The video is indeed broken. On Sun, Sep 2, 2012 at 3:34 PM, Andrew Rafas andras.ra...@gmail.com wrote: Hi! I just wanted to watch this screencast (Clojure Sequences) as I really need that little table which compares C#, Java and Clojure sequences. However the video on this link seems to be like 5 seconds long instead of more than an hour. Can you fix it? Or do you have the slides somewhere? http://blip.tv/clojure/clojure-sequences-740581 Thanks, Andrew -- 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: quick question about #'
I tend to like 1 better. I do not like working with vars without a good reason. -- 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: screencast corruption
I can't fix the version posted on blip.tv, but I downloaded it over a year ago when it was still working. It's a 107 MB quicktime file encoded using H.264. Running time is 1 hour 14 minutes. I could make it available somewhere, if that would help. // Ben On Sun, Sep 2, 2012 at 12:37 PM, Mayank Jain firesof...@gmail.com wrote: Confirmed. The video is indeed broken. On Sun, Sep 2, 2012 at 3:34 PM, Andrew Rafas andras.ra...@gmail.com wrote: Hi! I just wanted to watch this screencast (Clojure Sequences) as I really need that little table which compares C#, Java and Clojure sequences. However the video on this link seems to be like 5 seconds long instead of more than an hour. Can you fix it? Or do you have the slides somewhere? http://blip.tv/clojure/clojure-sequences-740581 Thanks, Andrew -- 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
Re: screencast corruption
I would appreciate, Thank you very much, Andrew On Sunday, September 2, 2012 4:19:10 PM UTC+1, bsmith.occs wrote: I can't fix the version posted on blip.tv, but I downloaded it over a year ago when it was still working. It's a 107 MB quicktime file encoded using H.264. Running time is 1 hour 14 minutes. I could make it available somewhere, if that would help. // Ben On Sun, Sep 2, 2012 at 12:37 PM, Mayank Jain fires...@gmail.comjavascript: wrote: Confirmed. The video is indeed broken. On Sun, Sep 2, 2012 at 3:34 PM, Andrew Rafas andras...@gmail.comjavascript: wrote: Hi! I just wanted to watch this screencast (Clojure Sequences) as I really need that little table which compares C#, Java and Clojure sequences. However the video on this link seems to be like 5 seconds long instead of more than an hour. Can you fix it? Or do you have the slides somewhere? http://blip.tv/clojure/clojure-sequences-740581 Thanks, Andrew -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clo...@googlegroups.comjavascript: Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+u...@googlegroups.com javascript: 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 clo...@googlegroups.comjavascript: Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+u...@googlegroups.com javascript: 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: quick question about #'
I usually store vars to functions when developing in the REPL. The practical difference is that when you redefine `foo' in the above example, calls via the `actions' map will use the old function as the function itself ist stored, while after redefining `bar' calls through `actions' will use the redefined function. There are other benefits, as thread-local bindings etc. You can read more about that on the http://clojure.org homepage. On Sun, Sep 2, 2012 at 2:34 PM, nicolas.o...@gmail.com nicolas.o...@gmail.com wrote: I tend to like 1 better. I do not like working with vars without a good reason. -- 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: Question about sets
This issue best illustrates how imperative and functional thinking differ.
When I write code such as
(map not [true false])
, I implicitly think imperatively: compiler, please traverse this
collection, applying 'not to each element
I could also word my thoughts functionally: I desire the filtering of
mapping of reducing... but my mind just doesn't work like that. I suspect
this applies to much people: it's not unusual to encounter the argument
that our view of the world is essentially imperative.
While imperativeness typically gets some things wrong -e.g. time/change-, I
believe we should't deny our imperative nature.
Just as in my previous example, when I encounter a set:
#{a b}
My first impression is to think about it as code, rather than data. It sure
is data, and Clojure would remain correct under its current approach of
throwing-on-duplicates, but this is a very unforgiving attitude towards
what I deem our natural way of thinking.
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Re: screencast corruption
You should be able to download it from here for the next few days: https://dl.dropbox.com/u/8238674/clojure-sequences.mov // Ben On Sun, Sep 2, 2012 at 6:56 PM, Andrew Rafas andras.ra...@gmail.com wrote: I would appreciate, Thank you very much, Andrew On Sunday, September 2, 2012 4:19:10 PM UTC+1, bsmith.occs wrote: I can't fix the version posted on blip.tv, but I downloaded it over a year ago when it was still working. It's a 107 MB quicktime file encoded using H.264. Running time is 1 hour 14 minutes. I could make it available somewhere, if that would help. // Ben On Sun, Sep 2, 2012 at 12:37 PM, Mayank Jain fires...@gmail.com wrote: Confirmed. The video is indeed broken. On Sun, Sep 2, 2012 at 3:34 PM, Andrew Rafas andras...@gmail.com wrote: Hi! I just wanted to watch this screencast (Clojure Sequences) as I really need that little table which compares C#, Java and Clojure sequences. However the video on this link seems to be like 5 seconds long instead of more than an hour. Can you fix it? Or do you have the slides somewhere? http://blip.tv/clojure/clojure-sequences-740581 Thanks, Andrew -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clo...@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+u...@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 clo...@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+u...@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
Status of the ClojureScript pluggable backend changes
What is the status of the Clojurescript pluggable backend? Are the latest changes in the main trunk? Are their any plans to do this? I'd like to work on an alternate back-end and I'd like to take advantage of this code. Timothy -- “One of the main causes of the fall of the Roman Empire was that–lacking zero–they had no way to indicate successful termination of their C programs.” (Robert Firth) -- 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: Possible to merge destructuring :or defaults with :as?
On Fri, 2012-08-31 at 03:40 -0700, Peter Taoussanis wrote:
(foo) = {:x x-default :y y-default}
I.e. to merge the :or defaults over the :args binding?
Such behavior would be quite surprising; to see why, desugar :keys:
{x (expr-that-computes :x),
y (expr-that-computes :y),
z (expr-that-computes :z),
:or {x x-default y y-default} :merge-as args}
which treats bindings as having bidirectional flow; we bind a name to
the value of a keyword, rewriting in the other direction if the value
isn't present.
Instead,
Rationale: one of the nice things of setting defaults via :or is that
they're visible to callers via :arglists. This'd help make the process
more convenient in the (relatively common) case where you'd like to
preserve arbitrary args, but apply some defaults in a transparent way.
When you want this,
(let [{blah} (merge my-defaults kwargs)]
--
Stephen Compall
^aCollection allSatisfy: [:each | aCondition]: less is better than
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Re: screencast corruption
Thanx Ben. That's the first time I've seen that preso and it really does help things click regarding the seq abstraction! On Sun, Sep 2, 2012 at 12:43 PM, Ben Smith-Mannschott bsmith.o...@gmail.com wrote: You should be able to download it from here for the next few days: https://dl.dropbox.com/u/8238674/clojure-sequences.mov -- 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 / RootBeer / CUDA / GPU
Guys, Has anyone read about RootBeer - https://github.com/pcpratts/rootbeer1 My understanding is that it can compile Java bytecode - CUDA GPU code. A Java class that you want to run on your CUDA GPU must subclass the RootBeer Kernel interface. So, I wondering what would happen if I 1) implement Kernel with some simple Clojure code that just e.g. adds a couple of numbers, get the class out onto disc, compile it with the Rootbeer compiler and try running the result on my GPU. 2) Pull the RootBeer compiler into a running Clojure image and figure out how to do the same thing on-the-fly. 3) Write e.g. (cuda-map f coll) which embeds f in a Kernel, copies the contents of coll and the new kernel up to your CUDA GPU and executes f on the contents of coll in parallel producing a new coll which is copied back into Clojure world and returned... Of course, there are lots of things to be resolved here, I have only had time today to Compile up the CUDA download, clone the RootBeer git repo, compile it and try to run the example program - ArraySumApp. I got an error which I am thinking indicates that RootBeer doesn't like my 1.7.0_03-icedtea-mockbuild_2012_06_13_11_56-b00 - the current version of Java on my Fedora16 box, but... think how much fun I could have with this little project :-). Anyway, I thought I would just announce my intentions to play with this on the list, in case anyone else was interested or already doing so and fancied collaborating or, maybe someone will be able to tell me why it will never work and save me the effort :-) all the best, Jules -- 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
Advice/recommendations for generating templated (non-Clojure) s-expressions?
Hello, I want to generate non-Clojure s-expressions in Clojure code, with a nice templating format (like syntax-quote provides), BUT with the option of providing my own methods/functions for resolving/processing symbols, and the ability to provide my own methods/functions for evaluating syntax-quote escapes, e.g. ~, @. Is there anything out there I can use? Here is some background: I have been playing around with generating SUO-KIF from Clojure code. ontolog.cim3.net/file/resource/reference/SIGMA-kee/suo-kif.pdf Here is an example SUO-KIF form: (= (instance ?COMPANY Coffeeshop) (exists (?SERVICE ?BEVERAGE) (and (instance ?SERVICE CommercialService) (agent ?SERVICE ?COMPANY) (instance ?SERVICE Selling) (patient ?SERVICE ?BEVERAGE) (instance ?BEVERAGE Coffee I'd like to generate the above via a Clojure macro/function that would be called like this: (sells Coffeeshop Coffee) By defining sells something like this: (defmacro-like-thing sells [kind-of-store product] `(= (instance ?COMPANY ~kind-of-store) (exists (?SERVICE ?PRODUCT)) … )) My initial thought was this was going to be completely trivial, and I'd be done in 30 minutes maximum and it is easy to generate something right away, but I am not at all happy with the result, especially what the Clojure code templates look like. It would be really nice if the resulting template would look very close to the resulting output, so that users of this tool (Ontologists, not programmers) could easily see/specify the templates. My first thought was that I would use Clojure macros and syntax-quote to generate the SUO-KIF s-expressions. To my way of thinking, syntax-quote is a very nice s-exp templating tool, what could be easier? I quickly re-learned that macros are a really about generating Clojure, at read time, that is then eval'ed. Two issues with that: 1) symbols in my template specification are resolved/namespace-qualified by syntax-quote, which is not what I want at all. 2) I don't want the resulting s-expression to be eval'ed by Clojure. I can work around that by having the the macro return (quote s-exp), I guess. I then tried using syntax-quote within a Clojure function, but again, syntax-quote is resolving/namespace-qualifying the symbols, and of course, a function's arguments are always evaluated on the way in, which leads to tedious and unpleasant quoting of SUO-KIF symbols. I'd welcome any thoughts/pointers about how best to approach this. Don -- 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 take-while with pred function that has state
Hi,
I am trying to write a function which takes a list of strings, tokenize
each one, and maximise N such that the number of unique tokens in the first
N strings is less than
some number M.
I have written the following function using take-while and a pred function
with an atom to store the set of unique tokens. It works and is just as
fast as a messier loop/recur version.
(defn take-as-many-as-possible-until
[ss tok-fn m]
(let [items (atom #{})]
(- (fn [v]
(swap! items (partial apply merge) (tok-fn v))
( (count @items) m))
(take-while ss
However, I have noticed that the take-while documentation says that the
pred function should be side-effect free. Will this be problem in my
implementation if I am calling it from multiple threads? And what would be
the more idiomatic way of implementing this kind of behaviour?
Thanks,
Shaobo
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Problems with Leiningen and Clojure 1.4
Hi Im having problems using Leiningen together with Clojure 1.4 (and 1.3) on Windows 7. Using Leiningen version 1.5.2 I can create a new project and use lein deps to download clojure version 1.2.1. However if I change dependencies in project.clj to org.clojure/clojure 1.4.0, I run into trouble. Running lein deps downloads clojure-1.4.0.jar to lib. Running lein repl gives: Warning: *classpath* not declared dynamic and thus is not dynamically rebindable, but its name suggests otherwise. Please either indicate ^:dynamic *classpath* or change the name. (NO_SOURCE_PATH:1) REPL started; server listening on localhost:50497. It starts up and gives me a prompt, but whatever I write at the prompt (even just enter) freezes the program, forcing me to exit with ctrl-c. I also tried using Leiningen 2.0.0. It automatically creates a project with Clojure 1.3.0 as dependency. Running lein deps gives no error but I cant find Clojure 1.3.0 downloaded anywhere. There is a .lein folder in C:\Users\Martin which contains a couple of jars but not the main Clojure one. Running lein repl starts clojure 1.3.0 without errors, but as above, as soon as I type anything it freezes. Any ideas? -- 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: Code retreat exercices where Clojure could shine?
If the audience is largely Java, then http://www.infoq.com/presentations/Clojure-Java-Interop ; The isBlank refactoring starting at about 13:50 is worth considering as a starting point. On Thursday, August 30, 2012 8:53:16 AM UTC-5, Denis Labaye wrote: On Thu, Aug 30, 2012 at 12:20 AM, Russell Whitaker russell@gmail.comjavascript: wrote: Clojure is inherently shiny, no need to gild the lily. yes but it has parenthesis What's the purpose and duration of your code retreat? 1 day subjects are free the public is 1/3 convinced by clojure / other languages, the other 2/3 are not aware that there's something else than Java on the JVM Russell On Monday, August 27, 2012 2:41:20 AM UTC-7, Denis Labaye wrote: Hi, I am organizing a code retreat in September. All languages are accepted, I want to use Clojure for this time, which exercises would make Clojure shine? Thanks! Denis -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clo...@googlegroups.comjavascript: Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+u...@googlegroups.com javascript: 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
Why IPersistentList doesn't extend ISeq?
Why IPersistentList doesn't extend ISeq? Clojure docs say: Lists are collections. They implement the ISeq interface directly (except for the empty list, which is not a valid seq) At this moment EmptyList implements ISeq, but PersistentList doesn't. It seems very strange for me. Also PersistentQueue implements IPersistentList, but semantically it is not a list. I think we can do 2 changes in hierarchy: 1) extend IPersistentList from ISeq; 2) extend PersistentQueue directly from IPersistentStack instead of IPersistentList. Is it possible? -- 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
Clojurescript keywords starting with numbers and read-string
Hi, I have a problem with read-string in Clojurescript. Reading keywords starting with a number will fail: (cljs.reader/read-string :123) (cljs.reader/read-string :1abc) Both will return following error: Uncaught TypeError: Cannot read property '0' of null I think this is a bug. Any suggestions? Cheers, Jens -- 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: European conferences in 2012?
On 29 August 2012 14:08, Jonathan Lange j...@mumak.net wrote: Just wondering if there are any conferences in Europe coming up in the remainder of the year that would be of interest to someone interested in Clojure? There's FP Days in Cambridge, UK on October 25th and 26th. http://www.fpdays.net/fpdays2012/index.php -A -- 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
How to run Clooj?
I am new to Clojure, I want to know how ot run the Clooj IDE? If it needs to install Clojure to my computer, or every time I use java -cp /path/to/the/clojure.jar clojure.main /path/to/your/code.clj to run my code? -- 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
Why IPersistentList doesn't extend ISeq?
From docs: Lists are collections. They implement the ISeq interface directly (except for the empty list, which is not a valid seq). But at this time IPersistentList does not extend ISeq (but PersistentList does). It sees a bit strange. Also PersistentQueue implements IPersistentList. Semantically queue differs from a list. Is it possible to extend IPersistentList from ISeq and PersistentQueue from IPersistentStack instead of IPersistentList? -- 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
Problems importing java classes
I'm attempting to translate some exercises from the book Introduction to
Computer Simulation Methods http://sip.clarku.edu/ from Java to Clojure.
First, I packaged up the opensourcephysics source
codehttp://www.opensourcephysics.org/document/ServeFile.cfm?ID=7147DocID=2267#Doc2267and
submitted it to clojars https://clojars.org/org.clojars.dwwoelfel/osp.
The source is on Github https://github.com/dwwoelfel/opensourcephysics.
Then I added it as a dependency to my project. Unfortunately, if I try to
import a class from opensourcephysics, I get
java.lang.ClassNotFoundException. I can't do lein compile without this
error:
Caused by: java.lang.ClassNotFoundException:
org.opensourcephysics.controls.AbstractSimulation
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at
clojure.lang.DynamicClassLoader.findClass(DynamicClassLoader.java:61)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at clojure.lang.RT.classForName(RT.java:2039)
at clojure.core$the_class.invoke(genclass.clj:99)
at clojure.core$generate_class.invoke(genclass.clj:119)
at clojure.core$gen_class.doInvoke(genclass.clj:622)
at clojure.lang.RestFn.invoke(RestFn.java:1124)
at clojure.lang.Var.invoke(Var.java:465)
at clojure.lang.AFn.applyToHelper(AFn.java:248)
at clojure.lang.Var.applyTo(Var.java:532)
at clojure.lang.Compiler.macroexpand1(Compiler.java:6366)
at clojure.lang.Compiler.analyzeSeq(Compiler.java:6441)
... 45 more
It appears that I've declared dependencies incorrectly, or packaged up the
opensourcephysics code incorrectly.
My project.clj looks like
(defproject fractal 0.1.0-SNAPSHOT
:description FIXME: write description
:url http://example.com/FIXME;
;; Same license as opensourcephysics
:license {:name GNU General Public License
:url http://www.gnu.org/copyleft/gpl.html}
:dependencies [[org.clojure/clojure 1.4.0]
[org.clojars.dwwoelfel/osp 2.3]]
:main fractal.fractalapp)
the fractal.fractalapp namespace declaration is:
(ns fractal.fractalapp
(:import [org.opensourcephysics.frames PlotFrame]
[org.opensourcephysics.controls SimulationControl])
(:gen-class :name org.opensourcephysics.controls.FractalApp
:extends org.opensourcephysics.controls.AbstractSimulation))
The source is available on Github: https://github.com/dwwoelfel/fractal
I'm not sure if it is a problem with the way I declare dependencies or with
the way I packed up the opensourcephysics code.
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I want to know how can I run it?
I have a file named pong.clj, it isunder following, I want to know how can
I run it?
Thank you.
(ns example.game.pong
(:use [penumbra opengl]
[clojure.contrib.def])
(:require [penumbra [app :as app] [text :as text]]))
(def ball-width 0.03)
(def ball-height 0.03)
(def paddle-width 0.02)
(def paddle-height 0.15)
;;;
(defn abs [x] (Math/abs x))
(defn intersect-1d [[a b] [x y]]
(and (= a y) (= b x)))
(defn intersect-2d [[a b c d] [x y z w]]
(and (intersect-1d [a c] [x z])
(intersect-1d [b d] [y w])))
(defn reflector [[x y w h] f]
(let [r [x y (+ x w) (+ y h)]]
(fn [region velocity]
(if (intersect-2d region r)
(f velocity)
velocity
(defvar boundaries
[(reflector [0 -1 1 1] (fn [[x y]] [x (abs y)]))
(reflector [0 1 1 1] (fn [[x y]] [x (- (abs y))]))
(reflector [-1 0 1 1] (fn [[x y]] [(abs x) y]))
(reflector [1 0 1 1] (fn [[x y]] [(- (abs x)) y]))])
(defn update-ball [state dt]
(let [ball (concat (:p state) (map + (:p state) [ball-width ball-height]))
v (reduce
#(%2 ball %1) (:v state)
(conj
boundaries
(reflector [0.01 (:left state) paddle-width paddle-height]
(fn [[x y]] [(abs x) y]))
(reflector [(- 0.99 paddle-width) (:right state) paddle-width
paddle-height]
(fn [[x y]] [(- (abs x)) y]]
(assoc state
:v v
:p (map + (:p state) (map (partial * dt) v)
(defn draw-ball [pos]
(push-matrix
(apply translate pos)
(draw-quads
(vertex 0 0)
(vertex ball-width 0)
(vertex ball-width ball-height)
(vertex 0 ball-height
;;;
(defn update-opponent-paddle [state]
(let [[x y] (:p state)
[vx vy] (:v state)
dt (/ (- 1 x) vx)
dy (- (+ y (* vy dt)) (:right state))]
(assoc state
:v-right (if (neg? vx) 0 (/ dy dt)
(defn update-player-paddle [state]
(assoc state
:v-left
(cond
(app/key-pressed? :up) -1
(app/key-pressed? :down) 1
:else 0)))
(defn update-paddle [dt v pos]
(min (- 1 paddle-height) (max 0 (+ pos (* dt v)
(defn draw-paddle [x y]
(push-matrix
(translate x y)
(draw-quads
(vertex 0 0)
(vertex paddle-width 0)
(vertex paddle-width paddle-height)
(vertex 0 paddle-height
;;;
(defn reset-game [state]
(assoc state
:v [0.4 0.8]
:p [0.5 0.5]
:left 0.5, :v-left 0.0
:right 0.5, :v-right 0.0))
(defn init [state]
(app/vsync! true)
(app/title! Pong)
(app/periodic-update! 2 update-opponent-paddle)
(reset-game state))
(defn reshape [[x y w h] state]
(ortho-view 0 1 1 0 -1 1)
state)
(defn update [[delta _] state]
(- state
(update-player-paddle)
(assoc :left (update-paddle delta (:v-left state) (:left state)))
(assoc :right (update-paddle delta (:v-right state) (:right state)))
(update-ball delta)))
(defn display [[delta _] state]
(draw-ball (:p state))
(draw-paddle 0.01 (:left state))
(draw-paddle (- 0.99 paddle-width) (:right state))
(app/repaint!))
(defn start []
(app/start
{:display display, :reshape reshape, :update update, :init init}
{}))
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Reflecting over protocols in macros for clojurescript
Hi there. I'm having a play around with ClojureScript, and I'd find it really useful to be able to be able to create some Mockito style test spies. Ultimately, I'd like to be able to generate a spy by reflecting over a protocol and find out what operations it supports programatically. However, now that I've looked core.cljs from the ClojureScript source code, it doesn't seem like the compiler actually keeps track of which protocols support which operations--is that right? Is there some other way of discovering the operations that a cljs protocol supports, or would i need to write my own analysis code for this? Thanks, -- Ceri Storey -- 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: webnoir on openshift (Paas by RedHat), little guide
now if only they had a webinar that explained the utterly horrendous leagaleze nightmare tolsoty-length terms and conditions. On Fri, Aug 31, 2012 at 2:49 PM, John Holland jbholl...@gmail.com wrote: This is awesome! On Friday, August 31, 2012 4:31:38 PM UTC-4, Simone Mosciatti wrote: A little guide to use webnoir on openshift http://sisciatech.tumblr.com/post/29614188595/webnoir-in-openshift English is not my first language, if you find any mistake please let me know. I hope it will be useful to somebody. Simone -- 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: Why IPersistentList doesn't extend ISeq?
First, IPersistentSeq is the interface, PersistentSeq is the actual class. If you look at it a little more closely, PersistentList extends ASeq, which is an abstract class. ASeq implements the ISeq interface. So PersistentList does implement ISeq through its parent class. https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/PersistentList.java#L16 - PersistentList extending ASeq https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/ASeq.java#L16 - ASeq implementing ISeq On Fri, Aug 31, 2012 at 12:58 PM, Andrei Zhlobich a.zhlob...@gmail.comwrote: Why IPersistentList doesn't extend ISeq? Clojure docs say: Lists are collections. They implement the ISeq interface directly (except for the empty list, which is not a valid seq) At this moment EmptyList implements ISeq, but PersistentList doesn't. It seems very strange for me. Also PersistentQueue implements IPersistentList, but semantically it is not a list. I think we can do 2 changes in hierarchy: 1) extend IPersistentList from ISeq; 2) extend PersistentQueue directly from IPersistentStack instead of IPersistentList. Is it possible? -- 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: Why IPersistentList doesn't extend ISeq?
Sorry, I meant IPersistentList and PersistentList in the first sentence of my previous email. On Sun, Sep 2, 2012 at 11:00 PM, Tamreen Khan histor...@gmail.com wrote: First, IPersistentSeq is the interface, PersistentSeq is the actual class. If you look at it a little more closely, PersistentList extends ASeq, which is an abstract class. ASeq implements the ISeq interface. So PersistentList does implement ISeq through its parent class. https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/PersistentList.java#L16 - PersistentList extending ASeq https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/ASeq.java#L16 - ASeq implementing ISeq On Fri, Aug 31, 2012 at 12:58 PM, Andrei Zhlobich a.zhlob...@gmail.comwrote: Why IPersistentList doesn't extend ISeq? Clojure docs say: Lists are collections. They implement the ISeq interface directly (except for the empty list, which is not a valid seq) At this moment EmptyList implements ISeq, but PersistentList doesn't. It seems very strange for me. Also PersistentQueue implements IPersistentList, but semantically it is not a list. I think we can do 2 changes in hierarchy: 1) extend IPersistentList from ISeq; 2) extend PersistentQueue directly from IPersistentStack instead of IPersistentList. Is it possible? -- 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
ANN: ClojureSphere updated
ClojureSphere has been updated with a new domain, refreshed index, and some new features: http://www.clojuresphere.com/ ClojureSphere lets you browse the dependency graph of the open source Clojure ecosystem. The dependency information is provides now is slightly more accurate and useful. There's also an API: http://www.clojuresphere.com/api Ideas and contributions welcome: https://github.com/jkk/clojuresphere Justin -- 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: Advice/recommendations for generating templated (non-Clojure) s-expressions?
Hi If the sexp will not be evaluated from clojure code, why aren't you using a function to generate the code instead of a macro. That avoids the namespace resolution. If you want to go with macros, there is a trick to turn namespace resolution of. just unquote like this @': Am 03.09.2012 01:07 schrieb Don Jackson cloj...@clark-communications.com : Hello, I want to generate non-Clojure s-expressions in Clojure code, with a nice templating format (like syntax-quote provides), BUT with the option of providing my own methods/functions for resolving/processing symbols, and the ability to provide my own methods/functions for evaluating syntax-quote escapes, e.g. ~, @. Is there anything out there I can use? Here is some background: I have been playing around with generating SUO-KIF from Clojure code. ontolog.cim3.net/file/resource/reference/SIGMA-kee/suo-kif.pdf Here is an example SUO-KIF form: (= (instance ?COMPANY Coffeeshop) (exists (?SERVICE ?BEVERAGE) (and (instance ?SERVICE CommercialService) (agent ?SERVICE ?COMPANY) (instance ?SERVICE Selling) (patient ?SERVICE ?BEVERAGE) (instance ?BEVERAGE Coffee I'd like to generate the above via a Clojure macro/function that would be called like this: (sells Coffeeshop Coffee) By defining sells something like this: (defmacro-like-thing sells [kind-of-store product] `(= (instance ?COMPANY ~kind-of-store) (exists (?SERVICE ?PRODUCT)) … )) My initial thought was this was going to be completely trivial, and I'd be done in 30 minutes maximum and it is easy to generate something right away, but I am not at all happy with the result, especially what the Clojure code templates look like. It would be really nice if the resulting template would look very close to the resulting output, so that users of this tool (Ontologists, not programmers) could easily see/specify the templates. My first thought was that I would use Clojure macros and syntax-quote to generate the SUO-KIF s-expressions. To my way of thinking, syntax-quote is a very nice s-exp templating tool, what could be easier? I quickly re-learned that macros are a really about generating Clojure, at read time, that is then eval'ed. Two issues with that: 1) symbols in my template specification are resolved/namespace-qualified by syntax-quote, which is not what I want at all. 2) I don't want the resulting s-expression to be eval'ed by Clojure. I can work around that by having the the macro return (quote s-exp), I guess. I then tried using syntax-quote within a Clojure function, but again, syntax-quote is resolving/namespace-qualifying the symbols, and of course, a function's arguments are always evaluated on the way in, which leads to tedious and unpleasant quoting of SUO-KIF symbols. I'd welcome any thoughts/pointers about how best to approach this. Don -- 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 take-while with pred function that has state
On Fri, 2012-08-31 at 05:08 -0700, shaobohou wrote:
I have written the following function using take-while and a pred
function with an atom to store the set of unique tokens. It works
Only because in the current implementation, take-while happens to be
called in coll order, which is not a guarantee of the API.
Will this be problem in my implementation if I am calling it from
multiple threads?
No.
And what would be the more idiomatic way of implementing this kind of
behaviour?
Consider this restructuring:
(- ss (map tok-fn), (reductions (partial apply merge) #{}),
(take-while #(...)), (map #(do %2 %1) ss), last)
Use of `atom' for this sort of thing is certainly an antipattern, so
consider any alternative that suits you.
--
Stephen Compall
^aCollection allSatisfy: [:each | aCondition]: less is better than
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Re: Problems importing java classes
On Fri, 2012-08-31 at 22:22 -0700, Daniel Woelfel wrote: Caused by: java.lang.ClassNotFoundException: org.opensourcephysics.controls.AbstractSimulation (ns fractal.fractalapp (:import [org.opensourcephysics.frames PlotFrame] [org.opensourcephysics.controls SimulationControl]) (:gen-class :name org.opensourcephysics.controls.FractalApp :extends org.opensourcephysics.controls.AbstractSimulation)) You should import AbstractSimulation before you try to reference it from gen-class. -- Stephen Compall ^aCollection allSatisfy: [:each | aCondition]: less is better than -- 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
