Re: java/Clojure MPI ..
Here is quick summary of results I obtained by googling. There are bunch of libraries out there ... among them are 1. mpiJava a java wrapper for the corresponding c libraries but seems dated... 2. MPJExpress .. seems to be under more active development. But yet to find any parallel linear algebra libraries that use either of these. Sunil. On Fri, Dec 31, 2010 at 12:45 PM, Sunil S Nandihalli sunil.nandiha...@gmail.com wrote: Hello everybody, I am looking for parallel programming libraries in Clojure. I found JavaMPI but its website does not seem to be updated since 2003. I would love to hear anything about where Java stands in distributed parallel computing. I get the feeling that the Parallel colt libraries are just for shared memory parallelism. I am primarily interested in large matrix computations.. . I currently need something that can do CGLS (conjugate Gradient Least squares ) in a distributed way. It is available in parallel colt libraries .. but it is only shared-memory parallel. I am sorry this is not directly related to Clojure but would love to hear what you all have to say. Thanks, Sunil. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: java/Clojure MPI ..
On 12/31/2010 3:36 AM, Sunil S Nandihalli wrote: Here is quick summary of results I obtained by googling. There are bunch of libraries out there ... among them are 1. mpiJava a java wrapper for the corresponding c libraries but seems dated... 2. MPJExpress .. seems to be under more active development. But yet to find any parallel linear algebra libraries that use either of these. I do computer algebra as my main open source project (Axiom) and I am unaware of any parallel linear algebra libraries in Java. Given that some boffin in Europe just made a 1000 core machine with local memory per processor I think there needs to be a lot more effort put into the parallel work. Unfortunately the various funding agencies don't seem to consider open source work fundable. I'm looking into constructing parallel programs with Clojure using MPI. Hopefully it will scale both concurrently and in parallel. Sunil. On Fri, Dec 31, 2010 at 12:45 PM, Sunil S Nandihalli sunil.nandiha...@gmail.com mailto:sunil.nandiha...@gmail.com wrote: Hello everybody, I am looking for parallel programming libraries in Clojure. I found JavaMPI but its website does not seem to be updated since 2003. I would love to hear anything about where Java stands in distributed parallel computing. I get the feeling that the Parallel colt libraries are just for shared memory parallelism. I am primarily interested in large matrix computations.. . I currently need something that can do CGLS (conjugate Gradient Least squares ) in a distributed way. It is available in parallel colt libraries .. but it is only shared-memory parallel. I am sorry this is not directly related to Clojure but would love to hear what you all have to say. Thanks, Sunil. -- 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: java/Clojure MPI ..
On 31 Dec 2010, at 09:36, Sunil S Nandihalli wrote: Here is quick summary of results I obtained by googling. There are bunch of libraries out there ... among them are 1. mpiJava a java wrapper for the corresponding c libraries but seems dated... 2. MPJExpress .. seems to be under more active development. That's my impression as well. But yet to find any parallel linear algebra libraries that use either of these. I haven't found any MPI-based library for Java yet. HPC in Java looks pretty dead. 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 Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: java/Clojure MPI ..
Hi Konrad, Have you looked at http://nativelibs4java.sourceforge.net/ It is created using a java native interface generater called jnaerator .. it does not seem to have any linear algebra library .. but may be a start .. I am only introduced to java from clojure .. Sunil. http://nativelibs4java.sourceforge.net/ On Fri, Dec 31, 2010 at 3:09 PM, Konrad Hinsen konrad.hin...@fastmail.netwrote: On 31 Dec 2010, at 09:36, Sunil S Nandihalli wrote: Here is quick summary of results I obtained by googling. There are bunch of libraries out there ... among them are 1. mpiJava a java wrapper for the corresponding c libraries but seems dated... 2. MPJExpress .. seems to be under more active development. That's my impression as well. But yet to find any parallel linear algebra libraries that use either of these. I haven't found any MPI-based library for Java yet. HPC in Java looks pretty dead. 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 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.comclojure%2bunsubscr...@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: Do type hints cause auto casting?
2010/12/31 Jarl Haggerty fictivela...@gmail.com I think I asked the wrong question, not only that but I guess I answered the question I asked, what I want to know is what exactly is a type hint. I think I've failed to understand exactly what a type hint is, I assumed to give a hint was to statically type something but that doesn't seem to be what happens here. They are there for helping the compiler generate efficient bytecode for java interop calls (e.g. `(.someMethod anObject ...) calls). Efficient bytecode is bytecode which does not involve the use of reflection at runtime ( e.g. calling getClass().getMethods(), choosing the right method by signature, etc.). Clojure compiler uses inference to minimize the number of required type hints. In Clojure 1.3 (not yet stable/released beyond alpha versions), type hints will also be used for generating efficient functions signatures with up to 4 long or double primitive arguments. HTH, -- Laurent On Dec 30, 9:18 pm, Sunil S Nandihalli sunil.nandiha...@gmail.com wrote: I don't think type hints lead to auto casting .. May be somebody else can throw more light on it. And it is this way by design. Sunil. On Fri, Dec 31, 2010 at 9:35 AM, Jarl Haggerty fictivela...@gmail.com wrote: I have this function (defn floor ^int [^float x] x) and (floor 1.5) returns 1.5 which confuses me as to how type hints work, I was expecting the result to be truncated or for the program to spit out some exception about expecting an int and getting a float. -- 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.comclojure%2bunsubscr...@googlegroups.com clojure%2bunsubscr...@googlegroups.comclojure%252bunsubscr...@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.comclojure%2bunsubscr...@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: java/Clojure MPI ..
On 31 Dec 2010, at 10:56, Sunil S Nandihalli wrote: Have you looked at http://nativelibs4java.sourceforge.net/ I have seen it, but not looked any closer. It is created using a java native interface generater called jnaerator .. it does not seem to have any linear algebra library .. but may be a start .. I am only introduced to java from clojure .. Me too, and I don't really want to do anything in Java itself. If JNA can be used to create efficient native interfaces (I haven't found the time yet to check it out), then I'd happily use clj-native to create Clojure-only JVM interfaces and forget about Java! 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 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: Time/size bounded cache?
The problem is that seen will grow without bounds. Is there a built in way to have some sort of LRU cache or should I use external libraries (like plru)? I wrote a persistent LRU cache: https://github.com/scode/plru It's not going to be as memory efficient as a LInkedArrayList, but if it matters to you do have it be persistent/immutable... -- / Peter Schuller -- 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 aset in clojure-1.3-alpha4
Hello Everybody, why does this give an error in clojure-1.3-alpha4 (aset (make-array Integer/TYPE 3 4 5) 1 2 3 -1) can anybody tell me as to how to do this right? Thanks, Sunil. -- 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
A Web Server in Clojure
I have read Fast Track Clojure's serials tutorial. lession 5 is about a web server. Below is part of demo code: (use 'clojure.contrib.server-socket) (create-server 8080 (fn [in out] (binding [*out* (java.io.PrintWriter. out)] (println HTTP/1.0 200 OK) (println Content-Type: text/html) (println ) (println h1Wooo hooo hooo, my first web server!/h1) (flush I found these codes could do well without any issue, while the browser have displayed nothing for error of 101 (net::ERR_CONNECTION_RESET). But another codes below all is okey. Was there someting wrong? (use 'clojure.contrib.server-socket) (import '(java.io BufferedReader InputStreamReader PrintWriter)) (create-server 8080 (fn [in out] (binding [ *in* (BufferedReader. (InputStreamReader. in)) *out* (PrintWriter. out)] (println HTTP/1.0 200 OK) (println Content-Type: text/html) (println ) (loop [line (read-line)] (println (str line br/)) (if-not (empty? line) (recur (read-line (flush -- 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
A Web Server in Clojure
I have read Fast Track Clojure's serials tutorial. lession 5 is about a web server. Below is part of demo code: (use 'clojure.contrib.server-socket) (create-server 8080 (fn [in out] (binding [*out* (java.io.PrintWriter. out)] (println HTTP/1.0 200 OK) (println Content-Type: text/html) (println ) (println h1Wooo hooo hooo, my first web server!/h1) (flush I found these codes could do well without any issue, while the browser have displayed nothing for error of 101 (net::ERR_CONNECTION_RESET). But another codes below all is okey. Was there someting wrong? (use 'clojure.contrib.server-socket) (import '(java.io BufferedReader InputStreamReader PrintWriter)) (create-server 8080 (fn [in out] (binding [ *in* (BufferedReader. (InputStreamReader. in)) *out* (PrintWriter. out)] (println HTTP/1.0 200 OK) (println Content-Type: text/html) (println ) (loop [line (read-line)] (println (str line br/)) (if-not (empty? line) (recur (read-line (flush -- 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: Do type hints cause auto casting?
The hints are not use for static type analysis they are there for speed. There is no type checker. In your example the compiler tries using it as an int if that is not working the compiler uses reflaction to find out the type. no auto casts are by design. On 31 Dez., 05:57, Jarl Haggerty fictivela...@gmail.com wrote: I think I asked the wrong question, not only that but I guess I answered the question I asked, what I want to know is what exactly is a type hint. I think I've failed to understand exactly what a type hint is, I assumed to give a hint was to statically type something but that doesn't seem to be what happens here. On Dec 30, 9:18 pm, Sunil S Nandihalli sunil.nandiha...@gmail.com wrote: I don't think type hints lead to auto casting .. May be somebody else can throw more light on it. And it is this way by design. Sunil. On Fri, Dec 31, 2010 at 9:35 AM, Jarl Haggerty fictivela...@gmail.comwrote: I have this function (defn floor ^int [^float x] x) and (floor 1.5) returns 1.5 which confuses me as to how type hints work, I was expecting the result to be truncated or for the program to spit out some exception about expecting an int and getting a float. -- 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.comclojure%2bunsubscr...@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
A Web Server in Clojure
I have read Fast Track Clojure's serials tutorial. lession 5 is about a web server. Below is part of demo code: (use 'clojure.contrib.server-socket) (create-server 8080 (fn [in out] (binding [*out* (java.io.PrintWriter. out)] (println HTTP/1.0 200 OK) (println Content-Type: text/html) (println ) (println h1Wooo hooo hooo, my first web server!/h1) (flush I found these codes could do well without any issue, while the browser have displayed nothing for error of 101 (net::ERR_CONNECTION_RESET). But another codes below all is okey. Was there someting wrong? (use 'clojure.contrib.server-socket) (import '(java.io BufferedReader InputStreamReader PrintWriter)) (create-server 8080 (fn [in out] (binding [ *in* (BufferedReader. (InputStreamReader. in)) *out* (PrintWriter. out)] (println HTTP/1.0 200 OK) (println Content-Type: text/html) (println ) (loop [line (read-line)] (println (str line br/)) (if-not (empty? line) (recur (read-line (flush -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: A Web Server in Clojure
Sorry for my net speed is too slow result in duplicate post. -- 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 aset in clojure-1.3-alpha4
This worked for me on 1.3.0: (aset-int (make-array Integer/TYPE 3 4 5) 1 2 3 -1) Might have something to do with the enhanced primitive support which causes array handling to be stricter than it was in 1.2? Just a guess. Allen On Fri, Dec 31, 2010 at 8:53 AM, Sunil S Nandihalli sunil.nandiha...@gmail.com wrote: Hello Everybody, why does this give an error in clojure-1.3-alpha4 (aset (make-array Integer/TYPE 3 4 5) 1 2 3 -1) can anybody tell me as to how to do this right? Thanks, Sunil. -- 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: Clojure in Small Pieces -- Literate Clojure
This looks very cool, and the opportunities for fully exploiting the power of a cross-referenced book format are very appealing Might I suggest two possible improvements: 1) Colored syntax highlighting for all clojure code. 2) Cross references for every clojure symbol used in the code --- I'd love to be able to click on + anywhere in the document and have it bring me to the proper section in the book discussing the arithmetic operators. Page 971 looks like it still overflows a bit :) I agree that some of the java parts of clojure were definitely developed on very large screens. Thanks for starting on this; best of luck, Sincerely, --Robert McIntyre On Fri, Dec 31, 2010 at 2:07 AM, Mark Engelberg mark.engelb...@gmail.com wrote: I find this exciting! Thanks for starting this. -- 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: Chunking is making my life more difficult.
On Dec 31, 12:48 am, Ken Wesson kwess...@gmail.com wrote: Is mapcat also semi-eager, then? I guess so. The Clojure 1.1 release notes also say, Some of the sequence processing functions (like map and filter) are now chunk-aware and leverage this efficiency. I should have mentioned that. -- 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: an object of class created using defrecord does not implement IFn .. while it behaves very similar to map otherwise ..
Generating readable code for IDEs is not a good reason. You should think carefully about variable capture and decide which you want. Usually, in a macro-generated defn, I do want to capture the parameters, so I would use ~'this. On Dec 30, 11:54 pm, André Thieme splendidl...@googlemail.com wrote: Am 31.12.2010 03:29, schrieb Alex Baranosky: I've been playing with making a macro to encapsulate Stuart's post, like this: (defmacro defrecord-ifn [name args] `(defrecord ~name ~...@args clojure.lang.IFn (invoke [this key] (get this key (defrecord-ifn Foo [a b c]) (def foo (Foo. A B C)) (prn (map foo [:a :c])) = (A, C) I get the error: No such var: user/this. I guess this is because it is expanding 'this' to 'user/this'. What is the proper way to get a macro like this to expand properly? Others have already pointed to this# . I just would like to add that you can as well use ~'this in some cases, where your macros generate defns. The advantage is that some editors (like emacs) will show you the parameter vector and that would show a useful name and not this_auto_foobarbaz123456 . -- 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: Time/size bounded cache?
I wrote a persistent LRU cache: https://github.com/scode/plru Yup, I've looked at it (mentioned in the original post). I might end up using it, thanks. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: A Web Server in Clojure
Both of these examples work for me (clojure 1.2). Is there an error on the console when you access the site? Also, if this is not a learning exercise, I recommend having a look at Compojure for web development. HTH, -- Miki -- 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: an object of class created using defrecord does not implement IFn .. while it behaves very similar to map otherwise ..
Be sure to also implement the version of get which takes a not-found argument so that your objects will work with map code which uses this functionality. (defrecord map-like-object [field-1 field-2 etc] clojure.lang.IFn (invoke [this k] (get this k)) (invoke [this k not-found] (get this k not-found))) sincerely, --Robert McIntryre On Fri, Dec 31, 2010 at 11:04 AM, Alyssa Kwan alyssa.c.k...@gmail.com wrote: Generating readable code for IDEs is not a good reason. You should think carefully about variable capture and decide which you want. Usually, in a macro-generated defn, I do want to capture the parameters, so I would use ~'this. On Dec 30, 11:54 pm, André Thieme splendidl...@googlemail.com wrote: Am 31.12.2010 03:29, schrieb Alex Baranosky: I've been playing with making a macro to encapsulate Stuart's post, like this: (defmacro defrecord-ifn [name args] `(defrecord ~name ~...@args clojure.lang.IFn (invoke [this key] (get this key (defrecord-ifn Foo [a b c]) (def foo (Foo. A B C)) (prn (map foo [:a :c])) = (A, C) I get the error: No such var: user/this. I guess this is because it is expanding 'this' to 'user/this'. What is the proper way to get a macro like this to expand properly? Others have already pointed to this# . I just would like to add that you can as well use ~'this in some cases, where your macros generate defns. The advantage is that some editors (like emacs) will show you the parameter vector and that would show a useful name and not this_auto_foobarbaz123456 . -- 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 aset in clojure-1.3-alpha4
Hi Allen .. is 1.3.0 out? and I did not know that aset had so many variants.. glad I asked .. now I know .. :) thanks Allen. Sunil. On Fri, Dec 31, 2010 at 8:19 PM, Allen Johnson akjohnso...@gmail.comwrote: This worked for me on 1.3.0: (aset-int (make-array Integer/TYPE 3 4 5) 1 2 3 -1) Might have something to do with the enhanced primitive support which causes array handling to be stricter than it was in 1.2? Just a guess. Allen On Fri, Dec 31, 2010 at 8:53 AM, Sunil S Nandihalli sunil.nandiha...@gmail.com wrote: Hello Everybody, why does this give an error in clojure-1.3-alpha4 (aset (make-array Integer/TYPE 3 4 5) 1 2 3 -1) can anybody tell me as to how to do this right? Thanks, Sunil. -- 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.comclojure%2bunsubscr...@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.comclojure%2bunsubscr...@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: clojure can't see a method in my protocol
Ken, Classloader visibility (http://dev.clojure.org/jira/browse/CLJ-371) is one possible point of confusion. If you have an AOT-compiled class, you can't replace it from the REPL which works from a child classloader. This is correct from a Java perspective, and easy enough to deal with one you know what is going on. But the ticket is there so somebody can propose something better. Stu On Thu, Dec 30, 2010 at 7:41 PM, André Thieme splendidl...@googlemail.com wrote: Do you observe this in a fresh Clojure? I ran into something similar, but with definterface. I had a definterface form and later added new functions to it, which I could not implement before restarting the JVM, as the interface has already been created the way I specified it in the first place. Tangent: this incident is the one I was referring to earlier in another thread regarding some of the defprotocol-related features combining poorly with in-REPL development, which I had trouble locating when I wanted to use it as an example. (And now that other thread where the topic came up is, of course, the one I can't seem to locate!) -- 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 aset in clojure-1.3-alpha4
Sorry I should have written 1.3.0-master-SNAPSHOT or whatever the convention is that represents the latest master build :) On Fri, Dec 31, 2010 at 11:21 AM, Sunil S Nandihalli sunil.nandiha...@gmail.com wrote: Hi Allen .. is 1.3.0 out? and I did not know that aset had so many variants.. glad I asked .. now I know .. :) thanks Allen. Sunil. On Fri, Dec 31, 2010 at 8:19 PM, Allen Johnson akjohnso...@gmail.com wrote: This worked for me on 1.3.0: (aset-int (make-array Integer/TYPE 3 4 5) 1 2 3 -1) Might have something to do with the enhanced primitive support which causes array handling to be stricter than it was in 1.2? Just a guess. Allen On Fri, Dec 31, 2010 at 8:53 AM, Sunil S Nandihalli sunil.nandiha...@gmail.com wrote: Hello Everybody, why does this give an error in clojure-1.3-alpha4 (aset (make-array Integer/TYPE 3 4 5) 1 2 3 -1) can anybody tell me as to how to do this right? Thanks, Sunil. -- 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 -- 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 aset in clojure-1.3-alpha4
(aset (make-array Integer/TYPE 3 4 5) 1 2 3 -1) can anybody tell me as to how to do this right? (aset (make-array Long/TYPE 3 4 5) 1 2 3 -1) I *think* that number by default are long, and the array is of ints. HTH, -- Miki http://clojurewise.blogspot.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
Re: Chunking is making my life more difficult.
ehanneken ehanne...@pobox.com writes:
I spent a long time debugging some Clojure code yesterday. The
essence of it looked similar to this:
(defn items []
(mapcat expensive-function (range 0 4000 100)))
. . . (take 5 (items)) . . .
I tried to distill the problem down by defining a non-chunking range
function (a simple variant), then working outward from there to see what
else is evaluating a surprising number of times.
,
| (defn non-chunked-range
| [start end]
| (prn (format In non-chunked-range with %d and %d. start end))
| (lazy-seq
|(when-not (= start end)
| (cons start (non-chunked-range (inc start) end)
`
Note that `mapcat` is defined in terms of `map` and `concat`. First
let's confirm that `map` is not eager:
,
| ;; Draws one, and evaluates lazy sequence function twice:
| (take 1
| (map #(list %)
|(non-chunked-range 0 10)))
`
Experimenting with the argument to `take` shows that the lazy sequence
function is evaluated as expected: a number of times equal to the
argument plus one for the terminal case (n + 1).
Now add `concat` into the mix to make sure it's not eager:
,
| ;; Draws two, and evaluates lazy sequence function three times:
| (concat (take 2 (non-chunked-range 0 10)))
`
That works as expected. Now add `apply` to `concat` as `mapcat` does to
flatten the input lists:
,
| ;; Draws one, and evaluates lazy sequence five times:
| (take 1
| (apply concat
| (map #(list %)
| (non-chunked-range 0 10
`
Whoah! Where did the extra three evaluations of the lazy sequence
function come from? Note that this one calls on the function /five/
times.
Here is the mapping of the argument to `take` and the number of times
the function is called:
take calls
=
0 5
1 5
2 5
3 5
4 6
5 7
...
n n + 2
I read the source for `concat`, but I don't see what it's doing to force
the extra evaluations both below four arguments and the extra one
(yielding n + 2) with four or more arguments. What's responsible for
this difference in behavior?
--
Steven E. Harris
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Re: Do type hints cause auto casting?
In Clojure 1.2, type hints only help the compiler avoid reflection and thus generate faster Java interop code. Starting in 1.3, function arguments and return values can have ^long or ^double type hints (int and float are not supported). These are enforced at compile time, but they are not type-casts. For example: Clojure 1.3.0-master-SNAPSHOT user= (defn floor ^long [^double x] x) CompilerException java.lang.RuntimeException: java.lang.IllegalArgumentException: Mismatched primitive return, expected: long, had: double The `long` and `double` functions can be used to coerce primitives to their respective types. user= (defn floor ^long [^double x] (long x)) #'user/floor user= (floor 1.5) 1 -Stuart Sierra clojure.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
Re: using aset in clojure-1.3-alpha4
Yes, integer literals are longs by default in 1.3. As noted, this works:
(aset-int (make-array Integer/TYPE 3 4 5) 1 2 3 -1)
My intuition says this should work as well, but it doesn't:
(aset ^ints (make-array Integer/TYPE 3 4 5) 1 2 3 (int -1))
IllegalArgumentException argument type mismatch
java.lang.reflect.Array.set
The reason why becomes apparent on examining the source of aset:
(defn aset
{:inline (fn [a i v] `(. clojure.lang.RT (aset ~a (int ~i) ~v)))
:inline-arities #{3}
:added 1.0}
([array idx val]
(. Array (set array idx val))
val)
([array idx idx2 idxv]
(apply aset (aget array idx) idx2 idxv)))
When given more than three arguments, `aset` uses `apply`, which does not
accept primitive arguments. Thus, for multidimensional arrays, `aset`
cannot be called with primitive arguments.
With single-dimensional arrays, `aset` works on primitives as expected:
(aset (int-array 3) 1 -1)
-Stuart Sierra
clojure.com
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Re: Chunking is making my life more difficult.
Chas, Thanks for your help. However, modifying the code to use mapcat instead of (map println) seems to cause some chunking: (defn tenify [n] (do (println \ n \) [n n n n n n n n n n])) = (- (range 50) (mapcat list) (mapcat tenify) first) 0 1 2 3 0 And indeed, when I modify my code I see four HTTP GETs being issued. Four is better than 32, but still. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Clojure in Small Pieces -- Literate Clojure
On 12/31/2010 10:36 AM, Robert McIntyre wrote: This looks very cool, and the opportunities for fully exploiting the power of a cross-referenced book format are very appealing Might I suggest two possible improvements: 1) Colored syntax highlighting for all clojure code. 2) Cross references for every clojure symbol used in the code --- I'd love to be able to click on + anywhere in the document and have it bring me to the proper section in the book discussing the arithmetic operators. I can't help much with the colored syntax. I am partially color blind so I don't find colors all that useful. Cross references occur naturally as part of the markup process. The current chunks are much too large but that will change. One useful side-effect of markup is that you can find where a symbol is defined and every use of that symbol. Of course, since everything is in one file you only need a text editor to find anything. Page 971 looks like it still overflows a bit :) I agree that some of the java parts of clojure were definitely developed on very large screens. Yeah, what I posted is only a snapshot to see if anyone else found the idea interesting. I don't think that most programmers have ever seen literate documentation so this may be their first exposure to the idea. Thanks for starting on this; best of luck, Sincerely, Thanks. I think that this is really useful in some contexts, especially where you're trying to bring new developers up to speed on a language. One problem I've found with open source is that once the original developer team leaves the project just dies. Another problem is that new developers will add new features that are already in the language elsewhere. Working with the actual source surrounded by an explanation of why the code exists and the ideas behind the code seems to me to solve both problems. The other problem is that clever code is hard to maintain even for the original authors. I got my own dirt simple code back after 15 years and, while I understood what the code did, I had no idea why it was there. Sometimes whole subsystems die because they are no longer used but nobody is able to remove the dead code because they don't understand 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 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
chunked-seq? is lying?
In 1.2, I don't understand why one of the sequences below is chunked, but the other is not. Also, chunked-seq? seems to be lying about the second one. user (take 1 (map #(do (print .) [% %2]) (range 100) (range 100))) (.[0 0]) user (take 1 (map #(do (print .) [%]) (range 100))) ([0]) user (chunked-seq? (map #(do (print .) [%]) (range 100))) false Mike -- 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
Vars problem
Good day Before anything I'd like to thank you for your time I've the following problem: user= (def x 1) #'user/x user= (def y 1) #'user/y user= (+ x y) 2 user= (binding [x 2 y 3] (+ x y)) IllegalStateException Can't dynamically bind non-dynamic var: user/x clojure.lang.Var.pushThreadBindings (Var.java:339) The origin of this code is: http://clojure.org/vars Thank you Luis Alejandro Rangel Sánchez -- 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: chunked-seq? is lying?
Hi, Am 31.12.2010 um 19:57 schrieb Mike K: In 1.2, I don't understand why one of the sequences below is chunked, but the other is not. Also, chunked-seq? seems to be lying about the second one. user (take 1 (map #(do (print .) [% %2]) (range 100) (range 100))) (.[0 0]) user (take 1 (map #(do (print .) [%]) (range 100))) ([0]) user (chunked-seq? (map #(do (print .) [%]) (range 100))) false For map with multiple input sequences all sequences would probably be have to be chunked with the same chunk size. So instead of checking this, map produces for multiple input sequences a non-chunked seq. Sincerely Meikel -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Vars problem
Hi, Am 31.12.2010 um 20:12 schrieb xlarsx: Good day Before anything I'd like to thank you for your time I've the following problem: user= (def x 1) #'user/x user= (def y 1) #'user/y user= (+ x y) 2 user= (binding [x 2 y 3] (+ x y)) IllegalStateException Can't dynamically bind non-dynamic var: user/x clojure.lang.Var.pushThreadBindings (Var.java:339) The origin of this code is: http://clojure.org/vars This a change in the upcoming 1.3 release. Vars have to be declared explicitly dynamic to be able to rebind them via binding. But I don't know the exact syntax how to do this. Sincerely Meikel -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Vars problem
On Fri, Dec 31, 2010 at 11:12 AM, xlarsx xla...@gmail.com wrote: user= (binding [x 2 y 3] (+ x y)) IllegalStateException Can't dynamically bind non-dynamic var: user/x clojure.lang.Var.pushThreadBindings (Var.java:339) The origin of this code is: http://clojure.org/vars The docs refer to Clojure 1.2 but the error you're seeing indicates you're running Clojure 1.3 (alpha/snapshot), yes? In Clojure 1.3, variables must be declared dynamic in order to change their bound value: (def ^:dynamic x 1) (def ^:dynamic y 1) (binding [x 2 y 3] (+ x y)) -- Sean A Corfield -- (904) 302-SEAN Railo Technologies, Inc. -- http://getrailo.com/ An Architect's View -- http://corfield.org/ If you're not annoying somebody, you're not really alive. -- Margaret Atwood -- 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: chunked-seq? is lying?
OK, I understand the difference in behavior between the two maps. But why is chunked-seq? incorrect? user (take 1 (map #(do (print .) [%]) (range 100))) ([0]) user (chunked-seq? (range 100)) false user (chunked-seq? (map #(do (print .) [%]) (range 100))) false user (chunked-seq? (take 1 (map #(do (print .) [%]) (range 100 false The implementation of chunked-seq? checks to see if the sequence is an instance of clojure.lang.IChunkedSeq. That doesn't appear to be sufficient in the case of map taking one collection. Also, Chas Emerick stated in another discussion that ranges always produce chunked seqs, but the value of (chunked-seq? (range 100)) seems to belie that. Mike -- 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: Loading JNI
Msd, something like this java -Djava.library.path=/usr/local/lib -cp clojure-1.2.0.jar:src clojure.main or in lein add :native-path /usr/local/lib:/usr/lib to your project def then you should be able to make the JNI/JNA calls On Dec 31, 12:39 pm, ax2groin ax2gr...@gmail.com wrote: I'm having trouble formulating a method to load JNI libraries into System. I'm just getting started, so this is a newbie question. I want something like this: (defn get-jni-path Derive the path to DLLs from environmental variables [] (let [path (System/getenv APP_CONFIG_DIR)] (str (.substring path 0 (- (.length path) (.length Config))) bin/))) (defn load-jni Load the required libraries into the System so that the JNI works. [] (let [paths (map #(str (get-jni-path) %) [coms.dll, sqlite.dll, utils.dll, zlib.dll])] (doto System (load paths But obviously I cannot handle the paths like this. I'm sure it's a simple answer, but I'm missing it. Thanx, msd -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: A Web Server in Clojure
There is no any error when I access http://127.0.0.1:8080 by browser. While with wget, there will be some messages as below: --2011-01-01 09:22:49-- (try:20) http://127.0.0.1:8080/ Connecting to 127.0.0.1:8080... connected. HTTP request sent, awaiting response... 200 No headers, assuming HTTP/ 0.9 Length: unspecified index.html has sprung into existence. Giving up. On 1月1日, 上午12时10分, Miki miki.teb...@gmail.com wrote: Both of these examples work for me (clojure 1.2). Is there an error on the console when you access the site? Also, if this is not a learning exercise, I recommend having a look at Compojure for web development. HTH, -- Miki -- 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: chunked-seq? is lying?
On Dec 31, 2010, at 5:53 PM, Mike K wrote: OK, I understand the difference in behavior between the two maps. But why is chunked-seq? incorrect? Also, Chas Emerick stated in another discussion that ranges always produce chunked seqs, but the value of (chunked-seq? (range 100)) seems to belie that. I was being a little loose in my description. Ranges always produce chunked seqs via seq: = (chunked-seq? (range 10)) false = (chunked-seq? (seq (range 10))) true `range` returns a lazy seq, which guards the chunked seq. Lazy seqs are never chunked themselves (otherwise, proper laziness would never be possible) but the seqs they provide are always aligned with the chunkiness of whatever lies beneath the lazy seq: = (chunked-seq? (seq (lazy-seq '(1 2 3 false = (chunked-seq? (seq (lazy-seq [1 2 3]))) true - Chas -- 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
