Re: laziness performance question
On May 21, 2009, at 1:32 AM, Konrad Hinsen wrote: > I can't say if there is an important difference between Haskell and > Clojure > implementation-wise. I would be surprised if the basic idea (passing thunks instead of values) were different or could be much different. On the other hand, there are fewer ways to force a thunk evaluation in Haskell, usually through I/O, the ironically-named `seq` operator, or a strictness annotation. That might have ramifications for the implementation. At the same time, Haskell is always compiled and GHC goes to incredible lengths to optimize code; as a statically-typed, pure FP language there may be more optimizations available for it than for Clojure (but also more boilerplate and a distinction between code and data). GHC-compiled Haskell code probably outperforms Clojure code by quite a bit right now, but you're losing a fair amount of flexibility for it. And I doubt that the performance difference has much to do with laziness or how laziness is implemented in it. — Daniel Lyons http://www.storytotell.org -- Tell It! --~--~-~--~~~---~--~~ 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 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: laziness performance question
On May 20, 2009, at 5:42 PM, Raoul Duke wrote: > > hi, > > Seems like Haskell's laziness has an aura of "it will bite you > performance-wise sooner or later." What is different (I'm asking > didactically, not snarkily) about Clojure's laziness? Does it manage > to avoid some aspects of the "uh ohs" in Haskell? Yes, it does avoid most of them. Instead of having to grok monads and strictness annotations, you have doall and dorun which are just functions, and only sequences are lazy. Clojure's lazy sequences strike me as a balance between explicit iterators and a completely lazy language. Memoize and delay/force give you most of the other laziness or pure functional benefits you get in Haskell. (By the way, strictness annotations do wonders for making sense of Haskell.) Try it out. I bet you'll find it lots easier. — Daniel Lyons http://www.storytotell.org -- Tell It! --~--~-~--~~~---~--~~ 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 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: Bit-Shift without Sign-Extend?
On May 21, 2009, at 7:39 PM, CuppoJava wrote: > > Hi everyone, > I'm just wondering where the equivalent of the ">>>" operator is for > Clojure. I need it to do a divide-by-power-of-2 on unsigned bytes. I could use this too. — Daniel Lyons http://www.storytotell.org -- Tell It! --~--~-~--~~~---~--~~ 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 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: Call for Help!: Clojure Code for JavaOne Talk
Here is a more direct translation with type hints: (with-open [r (new java.io.BufferedReader (new java.io.FileReader "words.txt"))] (sort-by #(.toLowerCase #^String %) (mapcat #(.split #^String % " ") (line-seq r With the obvious advantage of not reading the file as a string. Regards, Tim. On May 22, 2:48 am, Timothy Pratley wrote: > >http://fupeg.blogspot.com/2009/05/javaone-talk-word-sort.htmlhttp://f... > (sort-by #(.toLowerCase %) (.split (slurp "words.txt") " ") --~--~-~--~~~---~--~~ 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 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 at JavaOne
>... impact part can be merged with the "business application" mindset by >generating a report that includes the data visualization (I think PDF >generation is built into processing). I've been doing some work with enlive and XHtmlRenderer - it's a pretty awesome way of generating (business, media, etc) PDF docs from html templates, css style sheets and clojure generated data. I could post some examples if there's any interest. Rgds, Adrian. On Thu, May 21, 2009 at 4:38 PM, Chas Emerick wrote: > > I'm guessing glitz and visual impact is what's going to wow the crowd, > especially in that environment, where it's likely that most people are > steeped in "business applications". > > Perhaps using one of the clojure-processing wrappers to do some > outrageously-slick data visualization, and then showing how little > code is required to do it and how much leverage the language provides > when addressing changes in requirements? Maybe the slick visual > impact part can be merged with the "business application" mindset by > generating a report that includes the data visualization (I think PDF > generation is built into processing). > > - Chas > > On May 18, 7:36 am, Rich Hickey wrote: > >> The audience is Java developers, many of whom will have never seen >> Clojure or any Lisp. >> >> I'd appreciate some suggestions *and help* preparing demos for the >> Script Bowl. What (that could be demonstrated in 4 minutes) would make >> you think - 'Clojure looks cool, I need to look into it'? What >> community contribution(s) should we showcase? > > > > > --~--~-~--~~~---~--~~ 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 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 for high-end game development
> Game developement? Some work has been done on using clojure with jogl (the java opengl library) Search this forum with "jogl" for details. > with the Android platform I'm pretty sure there is also an android implementation of clojure. Again, search this forum for "android". Rgds, Adrian. On Fri, May 22, 2009 at 4:29 AM, Mark Fayngersh wrote: > Game developement? > Definitely possible. I was even thinking of finding a way to bridge Clojure > with the Android platform > > Electronic Arts? > Most likely not. > > On Thu, May 21, 2009 at 2:35 PM, tcg wrote: >> >> You would think with Clojure's ability to make use of mutli cpu >> hardware it would be a good choice for high-end game development. >> >> Does anyone know if big game studios like Electronic Arts are using or >> looking into Clojure for this purpose? >> >> > > > > -- > ~phunny.pha...@gmail.com > ~mar...@archlinux.us > > > > --~--~-~--~~~---~--~~ 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 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 at JavaOne
Quite an old example which I think demonstrates this well: > http://clojure.googlegroups.com/web/2c-calculator.clj > > the fourth line can be combined with the third line for even more conciseness, no? --~--~-~--~~~---~--~~ 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 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 as a Java lib documentation / examples?
Check out clojure.org - focus on java interop, compilation and class generation. Mark Volkmann's http://java.ociweb.com/mark/clojure/article.html has a good general clojure overview and nice examples. Gen-class and proxy are the main tools you'll need for exposing your clojure libraries as java api's. Rgds, Adrian. On Fri, May 22, 2009 at 2:23 AM, Brett Morgan wrote: > > Hi guys, > > I have some evil thoughts of using Clojure as a java library so that i > can use both the STM and the persistent data structures in projects > that my team of java developers can work with. > > As much as I'd like to get the team coding in Clojure properly, I have > enough trouble selling the idea of using immutable data structures. If > I hide the clojure magic behind interfaces, I can have the team coding > in plain java, and wrap what they do in clojure transactions and what > not. I'd like to do this in a way that the clojure repl can still be > used to interact with the running server. > > So where do I start reading? =) > > -- > > Brett Morgan http://brett.morgan.googlepages.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 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 at JavaOne
> > Show how you can run a demo with a bug in it, trigger the bug, to > cause a break, fix the bug while in the break, and resume the demo > with the corrected code. > > You can do that? What do "Fix the bug while in the break" mean? I know you could do that in Common Lisp. I'd love to know how that works in clojure. What environment do I need? In my environment, all I see is "NullPointerException" wiith no hint as to where it might have occurred. - Eli --~--~-~--~~~---~--~~ 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 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 for high-end game development
Game developement? Definitely possible. I was even thinking of finding a way to bridge Clojure with the Android platform Electronic Arts? Most likely not. On Thu, May 21, 2009 at 2:35 PM, tcg wrote: > > You would think with Clojure's ability to make use of mutli cpu > hardware it would be a good choice for high-end game development. > > Does anyone know if big game studios like Electronic Arts are using or > looking into Clojure for this purpose? > > > > -- ~phunny.pha...@gmail.com ~mar...@archlinux.us --~--~-~--~~~---~--~~ 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 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: off topic - sending and receiving raw Ethernet frames from clojure/java
Can't be done using the standard Java library. You'll have to write some JNI code or find a JNI library. On May 20, 4:32 am, prhlava wrote: > Hello, > > Apologies for off topic post. > > I would like to send and receive raw ethernet frames from Clojure. > > So far, I found: > > http://netresearch.ics.uci.edu/kfujii/jpcap/doc/ > > but is sending and receiving raw ethernet packets possible with the > latest JDK using standard networking stack of JVM? > > Info I found is contradictory and most of it is old. > > The target platform this should work on are Linux, MacOS, and Windows. > My development platform is Linux. > > Kind regards, > > Vlad > > PS: I am not after UDP or any TCP/IP related stuff but trying to send/ > receive ethernet stuff directly. --~--~-~--~~~---~--~~ 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 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 -~--~~~~--~~--~--~---
Bit-Shift without Sign-Extend?
Hi everyone, I'm just wondering where the equivalent of the ">>>" operator is for Clojure. I need it to do a divide-by-power-of-2 on unsigned bytes. -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 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 for high-end game development
You would think with Clojure's ability to make use of mutli cpu hardware it would be a good choice for high-end game development. Does anyone know if big game studios like Electronic Arts are using or looking into Clojure for this purpose? --~--~-~--~~~---~--~~ 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 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 at JavaOne
Speaking of "walking/filtering code," what about walking _actual_ code? The only thing off the top of my mind would be an example of, say, a "Hello World" function, but with the code represented as a JTree. Say, in the function (pr (.toLowerCase "Hello World")), you'd see .toLowerCase as a node. You'd click on the node to edit it and enter .toUpperCase. After showing people the "HELLO WORLD," you could show them how the JTree used a zipper (or some similar walking tool) to edit the datastructure. This shows how a textual .clj file is only one of the possible representations of the datastructure, code is data, data is code, etc. etc. Even better, the JTree could be editing a live program... Or the program running the JTree itself! :) This doesn't have to be the actually example used. Someone else might be able to come up with something more practical, ideally implementing some of the xml stuff you were talking about. However, I can tell you that from my perspective, this whole "code is data" thing was a bit of an epiphany for me when I realized it allowed for things like in the example above. (And it's thanks to Clojure that I took the dive into lisp.) I think something like this might have some jazz to it. Not sure the other languages can play the same tune. (correct me if I'm wrong) Regards, On Thu, May 21, 2009 at 11:43 AM, Rich Hickey wrote: > > > > On May 21, 10:38 am, Chas Emerick wrote: > > I'm guessing glitz and visual impact is what's going to wow the crowd, > > especially in that environment, where it's likely that most people are > > steeped in "business applications". > > > > Perhaps using one of the clojure-processing wrappers to do some > > outrageously-slick data visualization, and then showing how little > > code is required to do it and how much leverage the language provides > > when addressing changes in requirements? Maybe the slick visual > > impact part can be merged with the "business application" mindset by > > generating a report that includes the data visualization (I think PDF > > generation is built into processing). > > > > Last year the JRuby demo was a fancy graphics thing that utilized the > motion sensor in the laptop + OpenGL or something. It really said > little about JRuby (IMO), other than that being on the JVM lets you > reach these libs, and perf was good enough. > > I'd like to do something modest but distinguishing. I have a vague > notion of showing some Clojure data originating in some XML off the > web, being passed to some filtering/walking code, getting displayed, > stored in a DB, all without specific DOM/model/recordset APIs, a > couple of lines for each task. This demonstrating the difference of > not being OO - using generic abstract data types like maps everywhere. > > Help wanted in implementing some demo code. > > Rich > > > > -- 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 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 at JavaOne
On May 21, 6:42 am, Rich Hickey wrote: > On May 21, 3:39 am, mikel wrote: > > > > > > > On May 18, 7:36 am, Rich Hickey wrote: > > > > I'll be doing two sessions involving Clojure at JavaOne this June. One > > > is a traditional talk (TS-4164), the other is as a participant in the > > > Script Bowl 2009: A Scripting Languages Shootout (PAN-5348). > > > > The 'script' bowl is a friendly competition, basically a place to show > > > off your language and seek audience acclaim. > > > > "Scripting language gurus returning from 2008 are Groovy, JRuby, > > > Jython, and Scala. This year there is also a new kid on the block: > > > Clojure." > > > > There are two very brief rounds, 4 minutes per language each round . > > > > round 1: Core language and libraries round (show something really cool > > > with the core language and libraries) > > > > round 2: Community round (show some significant community > > > contributions) > > > > Note there is no comparative aspect, each language presenter talks up > > > their own language and the audience decides, so it's not an > > > opportunity to draw contrasts explicitly. It's about being pro- > > > Clojure, not anti- anything else. > > > > The audience is Java developers, many of whom will have never seen > > > Clojure or any Lisp. > > > > I'd appreciate some suggestions *and help* preparing demos for the > > > Script Bowl. What (that could be demonstrated in 4 minutes) would make > > > you think - 'Clojure looks cool, I need to look into it'? What > > > community contribution(s) should we showcase? > > > Show something that does a lot of visible work quickly with very > > little code, where the code is still very readable and easy to > > understand. > > > Show how to do something that Java programmers have to do pretty > > often, and that requires many lines of code, but which requires very > > few lines of code in Clojure, yet the code is still very > > understandable. > > > Show how someone can look at a running demo and ask for a different > > feature, and you can implement the feature and have it show up in the > > running demo without needing to stop and restart it. > > > Show how you can run a demo with a bug in it, trigger the bug, to > > cause a break, fix the bug while in the break, and resume the demo > > with the corrected code. > > > Show how you can do all of this from a nice interactive session, but > > also quickly and easily package the demo app as a jarfile that you can > > deploy like any other jarfile. > > > Show how easy it is to look at the guts of any Java instance or class, > > and how easy it is to instantiate and use classes and interfaces. > > > Take a concurrent Java example that exhibits hard-to-debug threading > > issues (this should address pain that any server-side Java programmer > > has felt), and show how they go away in the presence of Clojure's > > safety guarantees. > > > Finally, show them that they don't lose performance by gaining these > > features. > > And in the second 4 minutes? :) > :-) Certainly you're under no obligation to do all (or any) of those. But I'll bet that any of them you can do will 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 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 -~--~~~~--~~--~--~---
Greater-Than not overloaded for bytes?
Hi, I noticed that one part of my code was being obscenely slow, so I set *warn-on-reflection* to true. (let [b (byte 30)] (> b 30)) gives Reflection warning, NO_SOURCE_PATH:498 - call to gt can't be resolved. But: (let [b (int 30)] (> b 30)) Is there a reason for having a byte-overloaded version of ">"? Currently I'm reading bytes from a byte-array and then upcasting it to integers to avoid reflection. Thanks -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 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 as a Java lib documentation / examples?
Try here: http://code.google.com/p/clojure/source/browse/ Brett Morgan wrote: > Hi guys, > > I have some evil thoughts of using Clojure as a java library so that i > can use both the STM and the persistent data structures in projects > that my team of java developers can work with. > > As much as I'd like to get the team coding in Clojure properly, I have > enough trouble selling the idea of using immutable data structures. If > I hide the clojure magic behind interfaces, I can have the team coding > in plain java, and wrap what they do in clojure transactions and what > not. I'd like to do this in a way that the clojure repl can still be > used to interact with the running server. > > So where do I start reading? =) > > --~--~-~--~~~---~--~~ 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 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 as a Java lib documentation / examples?
Hi guys, I have some evil thoughts of using Clojure as a java library so that i can use both the STM and the persistent data structures in projects that my team of java developers can work with. As much as I'd like to get the team coding in Clojure properly, I have enough trouble selling the idea of using immutable data structures. If I hide the clojure magic behind interfaces, I can have the team coding in plain java, and wrap what they do in clojure transactions and what not. I'd like to do this in a way that the clojure repl can still be used to interact with the running server. So where do I start reading? =) -- Brett Morgan http://brett.morgan.googlepages.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 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-mode install on Windows XP does not work, for me
klang writes: > This only works (for now) when using an alternative fork of clojure- > mode > > git clone git://github.com/technomancy/clojure-mode.git > > .. that's why I got the same error messages consistently on both XP, > OSX and Ubuntu .. I was able to contact jochu (the original maintainer of clojure-mode), and he's merged my changes upstream. I plan on helping to fix swank-clojure to work with trunk, but for now at least the obvious method will work. -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 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-mode install on Windows XP does not work, for me
This only works (for now) when using an alternative fork of clojure- mode git clone git://github.com/technomancy/clojure-mode.git .. that's why I got the same error messages consistently on both XP, OSX and Ubuntu .. /klang On May 18, 8:40 pm, klang wrote: > Using my existing definitions > > (setq clojure-src-root "~/lisp/clj") > > (setq swank-clojure-extra-classpaths > (cons (concat clojure-src-root "/swank-clojure") > (when (file-directory-p "~/.clojure") > (directory-files "~/.clojure" t ".jar$" > > This does not work, with "origin/master", rolling back to "origin/1.0" > works though. (with or without setting swank-clojure-extra-classpaths) > > Paul, you must have done something else to swank-clojure to make thing > work on origin/master? > > /klang > > On May 18, 7:14 pm, Paul Stadig wrote: > > > I just happened to be setting up emacs an a new Ubuntu install today. I > > think it might have something to do with 'add-classpath. The > > swank-clojure-init function is trying to add the swank-clojure directory to > > the classpath, but the 'require still fails when starting up the clojure > > REPL. > > > I added the following to my .emacs to get it to work: > > > (setq swank-clojure-extra-classpaths > > (cons "~/src/swank-clojure" > > (when (file-directory-p "~/.clojure") > > (directory-files "~/.clojure" t ".jar$" > > > Paul > > > On Mon, May 18, 2009 at 1:02 PM, Phil Hagelberg wrote: > > > > klang writes: > > > > > First things first: > > > > > swank doesn't load and slime can't connect to the *inferior-lisp* > > > > running clojure > > > > > I am missing something obvious, please advice. > > > > It's not your fault; it looks like the latest Clojure 1.1 snapshot is > > > not compatible with swank-clojure. I haven't been following it closely, > > > but somewhere between 1.0 and the present it's broken. It looks like > > > swank-clojure will need to be updated to work with the latest. > > > > In the meantime, cd to your checkout of clojure and perform: > > > > $ git checkout origin/1.0 > > > $ ant > > > > Then launch a new Emacs instance and M-x slime should work. This did the > > > trick for me at least. I'll update clojure-mode to work with 1.0 by > > > default so you don't need to do anything by hand. > > > > -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 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: Saving the Clojure.org webiste
Here's the magic incantation for using wget to pull a useful copy (no postprocessing required!): wget -krmnp -E -X/page,/message --no-check-certificate -P https://clojure.org replace target with the directory where you want the output and you're off to the races. Thanks to Kresimir Sojat for working this out. On May 19, 12:49 pm, Kei Suzuki wrote: > I wanted to save the Clojure.org website so that I can read it when > I'm off-line. The problem is that none of the website downloader tools > I found is satisfactory; the pages don't look right and links are > broken (I think I know now why they don't work by looking into the > html and css files of the website). So I wrote a downloader in > Clojure. It's a bit slow and inefficient (but I don't care). Besides > it depends on the way the website is written and organized. But it > does what I want, so I'm happy...until the website changes radically. > > I'll upload the code to the Clojure Google Groups file area. The file > name is save_clojure.org.tar.bz2. Hope you find it useful too. --~--~-~--~~~---~--~~ 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 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 at JavaOne
> I'd like to do something modest but distinguishing. I have a vague > notion of showing some Clojure data originating in some XML off the > web, being passed to some filtering/walking code, getting displayed, > stored in a DB, all without specific DOM/model/recordset APIs, a > couple of lines for each task. This demonstrating the difference of > not being OO - using generic abstract data types like maps everywhere. I agree that the uniform data structures are one of the really cool things about Clojure, but it seems like a fairly subtle point to try to get across in such a short amount of time; also, showing people a language with loads of parentheses *and* saying it's not OO may just scare people off ;-) Although to be fair, I haven't been to J1 so I'm not sure what the audience is going to be like. For me, 2 of the biggest things are: * using macros to add new control structures and eliminating boilerplate; and * changing code at runtime. However, given the time constraint I think that changing code at runtime will have more of a 'wow' factor to it, and will also be easier to demonstrate as you can, for example, have a app set up and running with a known defect, that you could fix as a demo. For enterprise users who value uptime this is going to be pretty cool (it's not that big a deal for the folks who run web sites as you can basically roll out changes across a server cluster by bouncing nodes already One other tip: if you're going to show source code then set the editor to highlight brackets in a very light colour so they don't stand out as much, I've often been surprised at how big a deal people make about them when coming from Algol family languages. Cheers, Ian. #ifndef __COMMON_SENSE__ | Ian Phillips #include | i...@ianp.org #endif| http://ianp.org/ --~--~-~--~~~---~--~~ 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 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: Call for Help!: Clojure Code for JavaOne Talk
> http://fupeg.blogspot.com/2009/05/javaone-talk-word-sort.htmlhttp://fupeg.blogspot.com/2009/05/javaone-talk-ruby-word-sort.html (sort-by #(.toLowerCase %) (.split (slurp "words.txt") " ") > implementations:http://fupeg.blogspot.com/2009/05/javaone-talk-prime-sieve.html CG had a very nice solution: http://clj-me.blogspot.com/2008/06/primes.html Apologies in advance if these deviate too far to be useful. --~--~-~--~~~---~--~~ 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 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: Feedback on new persistentmatrix datatype
On 21.05.2009, at 15:38, aperotte wrote: > Though I can't say I've thoroughly tested this, the intended > functionality is that you provide a nested structure and you specify > the shape of the units with the first argument. Ah, I see. I didn't try that at all. >> 2) Shapes and indices are all int, rather than long. This excludes >> really big arrays. Is there a reason for this choice other than >> saving space? > > I used ints because I don't think java arrays can be indexed with > longs. I could theoretically back the data structures with more than > one array, but the maximum index is defined by the int, I think. After a quick look at the Java docs, it seems you are right. This means Java arrays are quite limited in size by today's standards. > >> PS: I am using PersistentMatrix rather successfully in reading data >> from HDF5 files! > > Exciting! I was also taking a look at the NetCDF format. It looks > interesting as well. I have been using netCDF a lot in the past, but currently I am switching to HDF5 because it is more flexible and the C library has parallel I/O features. netCDF 4 will be a layer on top of HDF5 as well, so that format seems to have the best future. On the other hand, if you want to deal with existing netCDF files, you have to use the netCDF library. I haven't looked at their Java version yet. Konrad. --~--~-~--~~~---~--~~ 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 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 at JavaOne
I'd like to echo Laurent's words - getting rid of boiler plate code is tops. Quite an old example which I think demonstrates this well: http://clojure.googlegroups.com/web/2c-calculator.clj Most people are familiar with the code explosion that buttons and action listeners usually involve. [it needs some cleaning up - rset for example is not a good idea, and looks better with default look and feel and layout love] That being said ants is the best wow value obviously! On May 18, 11:12 pm, Laurent PETIT wrote: > As a general idea, I would say : > > specific to lisp: > the possibility to get rid of "boiler plate code", such as the one > involved in each and every (re)implementation of some GOF design > patterns. > > This could be either a demonstration of the power of higher order > functions or macros (the first with higher order functions *can* be > done in java, but it is such a pain in the ass to do this right with > anonymous functions that it is rarely done in practice, some spring > framework frameworks let apart) > > specific to clojure: > a demonstration of the ease of use of concurrent/parallel programming > constructs. > > 2009/5/18 Rich Hickey : > > > > > I'll be doing two sessions involving Clojure at JavaOne this June. One > > is a traditional talk (TS-4164), the other is as a participant in the > > Script Bowl 2009: A Scripting Languages Shootout (PAN-5348). > > > The 'script' bowl is a friendly competition, basically a place to show > > off your language and seek audience acclaim. > > > "Scripting language gurus returning from 2008 are Groovy, JRuby, > > Jython, and Scala. This year there is also a new kid on the block: > > Clojure." > > > There are two very brief rounds, 4 minutes per language each round . > > > round 1: Core language and libraries round (show something really cool > > with the core language and libraries) > > > round 2: Community round (show some significant community > > contributions) > > > Note there is no comparative aspect, each language presenter talks up > > their own language and the audience decides, so it's not an > > opportunity to draw contrasts explicitly. It's about being pro- > > Clojure, not anti- anything else. > > > The audience is Java developers, many of whom will have never seen > > Clojure or any Lisp. > > > I'd appreciate some suggestions *and help* preparing demos for the > > Script Bowl. What (that could be demonstrated in 4 minutes) would make > > you think - 'Clojure looks cool, I need to look into it'? What > > community contribution(s) should we showcase? > > > Thanks, > > > 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 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 at JavaOne
Modifying the running Java application is definitely a big plus and attraction. Also, showing off the features in the mainstream IDEs tells the Java developer that it is very easily approachable and participate in the whole classpath and tight integration with Java. Telling them how Java and Clojure can co-mingle as needed and inter-operate easily. Netbeans is a very popular free IDE and Enclojure plugin adds a very strong clojure support to it. Following blog post explains how the application can have socket REPL and can be used easily through Netbeans IDE to manipulate the running application in another JVM. http://clojure101.blogspot.com/2009/05/creating-clojure-repl-in-your.html On May 18, 10:46 am, falcon wrote: > I agree with John. For certain applications, the ability to modify > the code while it is running is very useful. > > Many language comparisons turn into syntax comparisons. Clojure has > enough interesting concepts (concurrency model, code as data, macros) > that it should be made to stand out. > > On May 18, 9:30 am, John Newman wrote: > > > > > I believe it was the presentation you gave on the ants simulation, where you > > updated the program while it was running. I'm not sure if the other > > languages in the shootout can do that, but I thought that was pretty > > awesome. > > > I think a display of building an application while it's running in front of > > you (be that a web app or a desktop app) is flashy and compelling. Not sure > > how far you could go with that though. > > > 2 cents. > > > Regards, > > > On Mon, May 18, 2009 at 5:42 PM, Laurent PETIT > > wrote: > > > > As a general idea, I would say : > > > > specific to lisp: > > > the possibility to get rid of "boiler plate code", such as the one > > > involved in each and every (re)implementation of some GOF design > > > patterns. > > > > This could be either a demonstration of the power of higher order > > > functions or macros (the first with higher order functions *can* be > > > done in java, but it is such a pain in the ass to do this right with > > > anonymous functions that it is rarely done in practice, some spring > > > framework frameworks let apart) > > > > specific to clojure: > > > a demonstration of the ease of use of concurrent/parallel programming > > > constructs. > > > > 2009/5/18 Rich Hickey : > > > > > I'll be doing two sessions involving Clojure at JavaOne this June. One > > > > is a traditional talk (TS-4164), the other is as a participant in the > > > > Script Bowl 2009: A Scripting Languages Shootout (PAN-5348). > > > > > The 'script' bowl is a friendly competition, basically a place to show > > > > off your language and seek audience acclaim. > > > > > "Scripting language gurus returning from 2008 are Groovy, JRuby, > > > > Jython, and Scala. This year there is also a new kid on the block: > > > > Clojure." > > > > > There are two very brief rounds, 4 minutes per language each round . > > > > > round 1: Core language and libraries round (show something really cool > > > > with the core language and libraries) > > > > > round 2: Community round (show some significant community > > > > contributions) > > > > > Note there is no comparative aspect, each language presenter talks up > > > > their own language and the audience decides, so it's not an > > > > opportunity to draw contrasts explicitly. It's about being pro- > > > > Clojure, not anti- anything else. > > > > > The audience is Java developers, many of whom will have never seen > > > > Clojure or any Lisp. > > > > > I'd appreciate some suggestions *and help* preparing demos for the > > > > Script Bowl. What (that could be demonstrated in 4 minutes) would make > > > > you think - 'Clojure looks cool, I need to look into it'? What > > > > community contribution(s) should we showcase? > > > > > Thanks, > > > > > Rich > > > -- > > 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 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 at JavaOne
On May 21, 10:38 am, Chas Emerick wrote: > I'm guessing glitz and visual impact is what's going to wow the crowd, > especially in that environment, where it's likely that most people are > steeped in "business applications". > > Perhaps using one of the clojure-processing wrappers to do some > outrageously-slick data visualization, and then showing how little > code is required to do it and how much leverage the language provides > when addressing changes in requirements? Maybe the slick visual > impact part can be merged with the "business application" mindset by > generating a report that includes the data visualization (I think PDF > generation is built into processing). > Last year the JRuby demo was a fancy graphics thing that utilized the motion sensor in the laptop + OpenGL or something. It really said little about JRuby (IMO), other than that being on the JVM lets you reach these libs, and perf was good enough. I'd like to do something modest but distinguishing. I have a vague notion of showing some Clojure data originating in some XML off the web, being passed to some filtering/walking code, getting displayed, stored in a DB, all without specific DOM/model/recordset APIs, a couple of lines for each task. This demonstrating the difference of not being OO - using generic abstract data types like maps everywhere. Help wanted in implementing some demo code. 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 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-mode install on Windows XP does not work, for me
klang writes: > There is still something obvious that I am missing, to get origin/ > master working, but at least I am missing it consistently on three > operating systems, yay me! :-) I think swank-clojure will have to be updated to support the latest origin/master; there must have been a breaking change in Clojure. Stick with 1.0 until it gets updated. -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 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 at JavaOne
The duck streams library should give some examples the Java crowd will be ready to appreciate. That, or maybe use the with-open macro. My $.02 On May 21, 7:42 am, Rich Hickey wrote: > On May 21, 3:39 am, mikel wrote: > > > > > On May 18, 7:36 am, Rich Hickey wrote: > > > > I'll be doing two sessions involving Clojure at JavaOne this June. One > > > is a traditional talk (TS-4164), the other is as a participant in the > > > Script Bowl 2009: A Scripting Languages Shootout (PAN-5348). > > > > The 'script' bowl is a friendly competition, basically a place to show > > > off your language and seek audience acclaim. > > > > "Scripting language gurus returning from 2008 are Groovy, JRuby, > > > Jython, and Scala. This year there is also a new kid on the block: > > > Clojure." > > > > There are two very brief rounds, 4 minutes per language each round . > > > > round 1: Core language and libraries round (show something really cool > > > with the core language and libraries) > > > > round 2: Community round (show some significant community > > > contributions) > > > > Note there is no comparative aspect, each language presenter talks up > > > their own language and the audience decides, so it's not an > > > opportunity to draw contrasts explicitly. It's about being pro- > > > Clojure, not anti- anything else. > > > > The audience is Java developers, many of whom will have never seen > > > Clojure or any Lisp. > > > > I'd appreciate some suggestions *and help* preparing demos for the > > > Script Bowl. What (that could be demonstrated in 4 minutes) would make > > > you think - 'Clojure looks cool, I need to look into it'? What > > > community contribution(s) should we showcase? > > > Show something that does a lot of visible work quickly with very > > little code, where the code is still very readable and easy to > > understand. > > > Show how to do something that Java programmers have to do pretty > > often, and that requires many lines of code, but which requires very > > few lines of code in Clojure, yet the code is still very > > understandable. > > > Show how someone can look at a running demo and ask for a different > > feature, and you can implement the feature and have it show up in the > > running demo without needing to stop and restart it. > > > Show how you can run a demo with a bug in it, trigger the bug, to > > cause a break, fix the bug while in the break, and resume the demo > > with the corrected code. > > > Show how you can do all of this from a nice interactive session, but > > also quickly and easily package the demo app as a jarfile that you can > > deploy like any other jarfile. > > > Show how easy it is to look at the guts of any Java instance or class, > > and how easy it is to instantiate and use classes and interfaces. > > > Take a concurrent Java example that exhibits hard-to-debug threading > > issues (this should address pain that any server-side Java programmer > > has felt), and show how they go away in the presence of Clojure's > > safety guarantees. > > > Finally, show them that they don't lose performance by gaining these > > features. > > And in the second 4 minutes? :) > > 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 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 at JavaOne
I'm guessing glitz and visual impact is what's going to wow the crowd, especially in that environment, where it's likely that most people are steeped in "business applications". Perhaps using one of the clojure-processing wrappers to do some outrageously-slick data visualization, and then showing how little code is required to do it and how much leverage the language provides when addressing changes in requirements? Maybe the slick visual impact part can be merged with the "business application" mindset by generating a report that includes the data visualization (I think PDF generation is built into processing). - Chas On May 18, 7:36 am, Rich Hickey wrote: > The audience is Java developers, many of whom will have never seen > Clojure or any Lisp. > > I'd appreciate some suggestions *and help* preparing demos for the > Script Bowl. What (that could be demonstrated in 4 minutes) would make > you think - 'Clojure looks cool, I need to look into it'? What > community contribution(s) should we showcase? --~--~-~--~~~---~--~~ 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 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-mode install on Windows XP does not work, for me
I have just tried my setup on both OSX and Ubuntu .. (with Paul's modifications) .. and there is something seriously wrong with my way of using clojure-mode to bootstrap the whole installation. I am looking at the same error-messages as described in my original post, on additional two different systems. Well, back to the drawing board for me. There is still something obvious that I am missing, to get origin/ master working, but at least I am missing it consistently on three operating systems, yay me! :-) /klang On May 21, 12:06 pm, Alen Ribic wrote: > Thanks this also worked for me on my Aquamacs Clojure slime setup. I > added your code to the customization.el file in ~/Library/ > Preferences/... > > -Alen > > On May 18, 7:14 pm, Paul Stadig wrote: > > > I just happened to be setting up emacs an a new Ubuntu install today. I > > think it might have something to do with 'add-classpath. The > > swank-clojure-init function is trying to add the swank-clojure directory to > > the classpath, but the 'require still fails when starting up the clojure > > REPL. > > > I added the following to my .emacs to get it to work: > > > (setq swank-clojure-extra-classpaths > > (cons "~/src/swank-clojure" > > (when (file-directory-p "~/.clojure") > > (directory-files "~/.clojure" t ".jar$" > > > Paul > > > On Mon, May 18, 2009 at 1:02 PM, Phil Hagelberg wrote: > > > > klang writes: > > > > > First things first: > > > > > swank doesn't load and slime can't connect to the *inferior-lisp* > > > > running clojure > > > > > I am missing something obvious, please advice. > > > > It's not your fault; it looks like the latest Clojure 1.1 snapshot is > > > not compatible with swank-clojure. I haven't been following it closely, > > > but somewhere between 1.0 and the present it's broken. It looks like > > > swank-clojure will need to be updated to work with the latest. > > > > In the meantime, cd to your checkout of clojure and perform: > > > > $ git checkout origin/1.0 > > > $ ant > > > > Then launch a new Emacs instance and M-x slime should work. This did the > > > trick for me at least. I'll update clojure-mode to work with 1.0 by > > > default so you don't need to do anything by hand. > > > > -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 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 bug?
On Thu, May 21, 2009 at 3:35 AM, Michael Wood wrote:
>
> On Thu, May 21, 2009 at 9:15 AM, Christophe Grand
> wrote:
> >
> > Cosmin Stejerean a écrit :
> >> On Wed, May 20, 2009 at 7:04 PM, George Jahad
> >> mailto:andr...@blackbirdsystems.net>>
> >> wrote:
> >>
> >>
> >> (def s1 (Symbol/create (.intern (first (.split "user/n1" "/")
> >>
> >> will fix your problem.
> >>
> >>
> >> That makes a lot of sense and I guess I should have paid attention to
> >> the function definition for Symbol/create. Thanks!
> >
> > You should also use Symbol/intern instead of Symbol/create.
>
> Is Symbol/create or Symbol/intern necessary? This seems to work:
>
> user=> (def s1 (symbol (first (.split "user/n1" "/"
> #'user/s1
> user=> (def s2 (symbol "user"))
> #'user/s2
> user=> (= s1 s2)
> true
> user=> (class s1)
> clojure.lang.Symbol
> user=> (class s2)
> clojure.lang.Symbol
> user=> (ns-publics s1)
> {s2 #'user/s2, s1 #'user/s1}
> user=> (ns-publics s2)
> {s2 #'user/s2, s1 #'user/s1}
> user=>
>
I don't know how I missed the symbol function in the API. Thanks.
--
Cosmin Stejerean
http://offbytwo.com
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Re: Feedback on new persistentmatrix datatype
> 1) What is the role of the first argument to PersistentMatrix/create? > It seems that anything else than (int-array [1]) leads to an error. Though I can't say I've thoroughly tested this, the intended functionality is that you provide a nested structure and you specify the shape of the units with the first argument. For example, if I provide a 8x10x2 nested structure that's intended to be a complex matrix, I would put an (int-array [2]) in the first argument and the result should be an 8x10 data structure with 2x1 dimensional units. I intended that an exception be thrown if the unit shape doesn't match the structure of the last few dimensions. > > 2) Shapes and indices are all int, rather than long. This excludes > really big arrays. Is there a reason for this choice other than > saving space? I used ints because I don't think java arrays can be indexed with longs. I could theoretically back the data structures with more than one array, but the maximum index is defined by the int, I think. > PS: I am using PersistentMatrix rather successfully in reading data > from HDF5 files! Exciting! I was also taking a look at the NetCDF format. It looks interesting as well. --~--~-~--~~~---~--~~ 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 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: Call for Help!: Clojure Code for JavaOne Talk
On Thu, May 21, 2009 at 4:59 AM, michaelg wrote:
>
> So if anyone would like to help, I would be very appreciative. All I
> can offer is recognition in my JavaOne talk. All I ask from the
> implementations is that they try to stay true to how the Java version
> worked, while also trying to be fairly idiomatic Clojure. I don't have
> a strong opinion on type hinting. If it is used, then I would not
> compare the results to Groovy, Ruby, Python, but to Scala, Fan instead
> and vice versa
I did reversible first -- here's what I came up with:
(defn all-odd? [n]
(every? odd? (map #(Integer. (str %)) (str n
(defn reverse-num [n]
(+ n (Integer. (apply str (reverse (str n))
(defn reversible-num? [n]
(all-odd? (reverse-num n)))
(defn count-reversible [rev-max]
{:max rev-max
:num-reversible (count (filter reversible-num? (range 11 rev-max)))})
Those stay very true to the ruby version you've already got.
If you're willing to wander a bit, I'm not sure whether
you'd rather go more succinct or faster. For example:
(defn all-odd? [n]
(every? #{\1 \3 \5 \9} (str n)))
That's a bit simpler and more succinct, but it's also a bit
slower than the original above. But you could go faster
instead:
(defn all-odd? [n]
(loop [n (int n)]
(cond
(zero? n) true
(even? n) false
:else (recur (int (quot n 10))
Use of primitive int and not messing with Strings makes that
one about 10x faster than the original.
Note we haven't used any traditional type hints yet, though
they can be useful. We can add a single type hint to
reverse-num and double its speed:
(defn reverse-num [n]
(+ n (Integer. #^String (apply str (reverse (str n))
But again primitive numbers win here if you care only about
speed. This one is more than 5 times faster than the
original reverse-num:
(defn reverse-num [n]
(loop [nrem (int n), rev (int 0)]
(if (zero? nrem)
(+ n rev)
(recur (int (quot nrem 10))
(int (+ (* 10 rev) (rem nrem 10)))
--Chouser
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Re: Clojure at JavaOne
On May 21, 3:39 am, mikel wrote: > On May 18, 7:36 am, Rich Hickey wrote: > > > > > I'll be doing two sessions involving Clojure at JavaOne this June. One > > is a traditional talk (TS-4164), the other is as a participant in the > > Script Bowl 2009: A Scripting Languages Shootout (PAN-5348). > > > The 'script' bowl is a friendly competition, basically a place to show > > off your language and seek audience acclaim. > > > "Scripting language gurus returning from 2008 are Groovy, JRuby, > > Jython, and Scala. This year there is also a new kid on the block: > > Clojure." > > > There are two very brief rounds, 4 minutes per language each round . > > > round 1: Core language and libraries round (show something really cool > > with the core language and libraries) > > > round 2: Community round (show some significant community > > contributions) > > > Note there is no comparative aspect, each language presenter talks up > > their own language and the audience decides, so it's not an > > opportunity to draw contrasts explicitly. It's about being pro- > > Clojure, not anti- anything else. > > > The audience is Java developers, many of whom will have never seen > > Clojure or any Lisp. > > > I'd appreciate some suggestions *and help* preparing demos for the > > Script Bowl. What (that could be demonstrated in 4 minutes) would make > > you think - 'Clojure looks cool, I need to look into it'? What > > community contribution(s) should we showcase? > > Show something that does a lot of visible work quickly with very > little code, where the code is still very readable and easy to > understand. > > Show how to do something that Java programmers have to do pretty > often, and that requires many lines of code, but which requires very > few lines of code in Clojure, yet the code is still very > understandable. > > Show how someone can look at a running demo and ask for a different > feature, and you can implement the feature and have it show up in the > running demo without needing to stop and restart it. > > Show how you can run a demo with a bug in it, trigger the bug, to > cause a break, fix the bug while in the break, and resume the demo > with the corrected code. > > Show how you can do all of this from a nice interactive session, but > also quickly and easily package the demo app as a jarfile that you can > deploy like any other jarfile. > > Show how easy it is to look at the guts of any Java instance or class, > and how easy it is to instantiate and use classes and interfaces. > > Take a concurrent Java example that exhibits hard-to-debug threading > issues (this should address pain that any server-side Java programmer > has felt), and show how they go away in the presence of Clojure's > safety guarantees. > > Finally, show them that they don't lose performance by gaining these > features. And in the second 4 minutes? :) 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 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-mode install on Windows XP does not work, for me
Thanks this also worked for me on my Aquamacs Clojure slime setup. I added your code to the customization.el file in ~/Library/ Preferences/... -Alen On May 18, 7:14 pm, Paul Stadig wrote: > I just happened to be setting up emacs an a new Ubuntu install today. I > think it might have something to do with 'add-classpath. The > swank-clojure-init function is trying to add the swank-clojure directory to > the classpath, but the 'require still fails when starting up the clojure > REPL. > > I added the following to my .emacs to get it to work: > > (setq swank-clojure-extra-classpaths > (cons "~/src/swank-clojure" > (when (file-directory-p "~/.clojure") > (directory-files "~/.clojure" t ".jar$" > > Paul > > On Mon, May 18, 2009 at 1:02 PM, Phil Hagelberg wrote: > > > klang writes: > > > > First things first: > > > > swank doesn't load and slime can't connect to the *inferior-lisp* > > > running clojure > > > > I am missing something obvious, please advice. > > > It's not your fault; it looks like the latest Clojure 1.1 snapshot is > > not compatible with swank-clojure. I haven't been following it closely, > > but somewhere between 1.0 and the present it's broken. It looks like > > swank-clojure will need to be updated to work with the latest. > > > In the meantime, cd to your checkout of clojure and perform: > > > $ git checkout origin/1.0 > > $ ant > > > Then launch a new Emacs instance and M-x slime should work. This did the > > trick for me at least. I'll update clojure-mode to work with 1.0 by > > default so you don't need to do anything by hand. > > > -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 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 -~--~~~~--~~--~--~---
Call for Help!: Clojure Code for JavaOne Talk
As they say on sports radio, long time listener, first time caller... I am giving a talk at JavaOne on alternative language performance on the JVM. I have written a couple of algorithms in Java, and then mostly equivalent ones in Groovy, Ruby, Python, Scala, and Fan. I would like to include Clojure in the talk, too, so I am hoping the folks here could help me out with Clojure implementations. You can see the Java examples here, along with the Ruby implementations: http://fupeg.blogspot.com/2009/05/javaone-talk-prime-sieve.html http://fupeg.blogspot.com/2009/05/javaone-talk-being-less-efficient.html http://fupeg.blogspot.com/2009/05/javaone-talk-ruby-prime-sieve.html http://fupeg.blogspot.com/2009/05/javaone-talk-word-sort.html http://fupeg.blogspot.com/2009/05/javaone-talk-ruby-word-sort.html http://fupeg.blogspot.com/2009/05/javaone-talk-reversible-numbers.html http://fupeg.blogspot.com/2009/05/javaone-talk-ruby-reversible-numbers.html So if anyone would like to help, I would be very appreciative. All I can offer is recognition in my JavaOne talk. All I ask from the implementations is that they try to stay true to how the Java version worked, while also trying to be fairly idiomatic Clojure. I don't have a strong opinion on type hinting. If it is used, then I would not compare the results to Groovy, Ruby, Python, but to Scala, Fan instead and vice versa --~--~-~--~~~---~--~~ 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 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 bug?
On Thu, May 21, 2009 at 9:15 AM, Christophe Grand wrote:
>
> Cosmin Stejerean a écrit :
>> On Wed, May 20, 2009 at 7:04 PM, George Jahad
>> mailto:andr...@blackbirdsystems.net>>
>> wrote:
>>
>>
>> (def s1 (Symbol/create (.intern (first (.split "user/n1" "/")
>>
>> will fix your problem.
>>
>>
>> That makes a lot of sense and I guess I should have paid attention to
>> the function definition for Symbol/create. Thanks!
>
> You should also use Symbol/intern instead of Symbol/create.
Is Symbol/create or Symbol/intern necessary? This seems to work:
user=> (def s1 (symbol (first (.split "user/n1" "/"
#'user/s1
user=> (def s2 (symbol "user"))
#'user/s2
user=> (= s1 s2)
true
user=> (class s1)
clojure.lang.Symbol
user=> (class s2)
clojure.lang.Symbol
user=> (ns-publics s1)
{s2 #'user/s2, s1 #'user/s1}
user=> (ns-publics s2)
{s2 #'user/s2, s1 #'user/s1}
user=>
--
Michael Wood
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Re: Clojure at JavaOne
On May 18, 7:36 am, Rich Hickey wrote: > I'll be doing two sessions involving Clojure at JavaOne this June. One > is a traditional talk (TS-4164), the other is as a participant in the > Script Bowl 2009: A Scripting Languages Shootout (PAN-5348). > > The 'script' bowl is a friendly competition, basically a place to show > off your language and seek audience acclaim. > > "Scripting language gurus returning from 2008 are Groovy, JRuby, > Jython, and Scala. This year there is also a new kid on the block: > Clojure." > > There are two very brief rounds, 4 minutes per language each round . > > round 1: Core language and libraries round (show something really cool > with the core language and libraries) > > round 2: Community round (show some significant community > contributions) > > Note there is no comparative aspect, each language presenter talks up > their own language and the audience decides, so it's not an > opportunity to draw contrasts explicitly. It's about being pro- > Clojure, not anti- anything else. > > The audience is Java developers, many of whom will have never seen > Clojure or any Lisp. > > I'd appreciate some suggestions *and help* preparing demos for the > Script Bowl. What (that could be demonstrated in 4 minutes) would make > you think - 'Clojure looks cool, I need to look into it'? What > community contribution(s) should we showcase? > Show something that does a lot of visible work quickly with very little code, where the code is still very readable and easy to understand. Show how to do something that Java programmers have to do pretty often, and that requires many lines of code, but which requires very few lines of code in Clojure, yet the code is still very understandable. Show how someone can look at a running demo and ask for a different feature, and you can implement the feature and have it show up in the running demo without needing to stop and restart it. Show how you can run a demo with a bug in it, trigger the bug, to cause a break, fix the bug while in the break, and resume the demo with the corrected code. Show how you can do all of this from a nice interactive session, but also quickly and easily package the demo app as a jarfile that you can deploy like any other jarfile. Show how easy it is to look at the guts of any Java instance or class, and how easy it is to instantiate and use classes and interfaces. Take a concurrent Java example that exhibits hard-to-debug threading issues (this should address pain that any server-side Java programmer has felt), and show how they go away in the presence of Clojure's safety guarantees. Finally, show them that they don't lose performance by gaining these features. --~--~-~--~~~---~--~~ 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 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: laziness performance question
On 21.05.2009, at 01:42, Raoul Duke wrote: > Seems like Haskell's laziness has an aura of "it will bite you > performance-wise sooner or later." What is different (I'm asking > didactically, not snarkily) about Clojure's laziness? Does it manage > to avoid some aspects of the "uh ohs" in Haskell? The main difference is that in Haskell, all evaluation is lazy, whereas in Clojure, only sequences are lazy by default. You can make your own lazy evaluation using delay, but if you do you know why you did it. This makes a big difference in terms of memory usage: for sequence processing, lazy evaluation actually helps in most cases, whereas elswhere its impact is difficult to estimate. In terms of CPU performance, lazy evaluation always entails an overhead. I can't say if there is an important difference between Haskell and Clojure implementation-wise. Konrad. --~--~-~--~~~---~--~~ 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 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: Saving the Clojure.org webiste
On Wed, May 20, 2009 at 9:05 PM, Kei Suzuki wrote: > > I should have uploaded the file in the .zip format for ease of > extraction. Since I don't know how to replace it with a .zip version > and I don't want to clutter the file area, I don't upload the zip > version. Mac and Linux users should have no problem of extracting the > files, and there should be bunch of free .tar.bz2 extraction tools > available for Windows. Sorry. > > On May 20, 5:36 am, Emeka wrote: >> What about the zip version of save_clojure.org.tar.bz2? Windows users can use 7-zip: http://www.7-zip.org/ -- 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 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 bug?
Cosmin Stejerean a écrit : > On Wed, May 20, 2009 at 7:04 PM, George Jahad > mailto:andr...@blackbirdsystems.net>> > wrote: > > > (def s1 (Symbol/create (.intern (first (.split "user/n1" "/") > > will fix your problem. > > > That makes a lot of sense and I guess I should have paid attention to > the function definition for Symbol/create. Thanks! You should also use Symbol/intern instead of Symbol/create. Christophe -- Professional: http://cgrand.net/ (fr) On Clojure: http://clj-me.blogspot.com/ (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 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 -~--~~~~--~~--~--~---
