Hooking into doc and source
I'm build a library which provides a DSL for building ontologies. Underneath this backs onto a Java API. The library works by provide some macros, which create Java objects then intern them into the local namespace. Now, I would like to be to support documentation and source code lookup. The ideal way to do this would be to use clojure.repl/doc and source functionality; I *think* in most cases this would mean that the various development environments would just work with my DSL. With the documentation, I can just add this to the metadata. But there is a problem; I also need this in the underlying Java objects, so that when the ontology is serialised, all the documentation goes with it. So now I have the documentation in two places. So, I really would like to hook into the doc function so that I can return a documentation string pulled directly from the underlying Java object; I already have a function for doing this, but do not know how to get the native Clojure facilities to call this, rather than just take the documentation directly from the metadata. Any suggestions gratefully recieved! Phil -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: is intellij idea a good ide for clojure development?
Another vote for Eclipse/CCW over Netbeans and IntelliJ. I used all three, and CCW's development has proven to be consistently better than plugins for the other IDE's. Both CCW's excellent Leiningen and REPL support, as the option to link projects when working on multiple sources at the same time have proven to be indispensable. As for Emacs, in my opinion you'd best get a good grip on Clojure development before taking on the whole new learning curve Emacs will pose. CCW's `strict` mode is almost on par with Emacs paredit, and will be when Barf/Slurp are introduced in the not too distant future. On Monday, January 28, 2013 12:37:54 PM UTC+1, HamsterofDeath wrote: the only ides i have used so far for clojure are intellij idea and netbeans. is there one that is a lot better? if yes, why? i am not interested in details or single features, i just want to know if there is some magic editor out there that i should look into because it is *obviously a lot* better - like in you should use an ide for java development instead of notepad -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
multicore list processing (was Re: abysmal multicore performance, especially on AMD processors)
Keeping the discussion here would make sense, esp. in light of meetup.com's horrible discussion board. I don't have a lot to offer on the JVM/Clojure-specific problem beyond what I wrote in that meetup thread, but Lee's challenge(s) were too hard to resist: Would your conclusion be something like 'Intensive list processing can't currently be done in Java (or Clojure/JVM) in a way that takes reasonable advantage of multiple cores.'? I see that rewrite without lists might be the only way out, but that'd be a bummer. Clojure is a multicore Lisp; if you can't use it for multicore list processing then... sigh. The nature of the `burn` program is such that I'm skeptical of the ability of any garbage-collected runtime (lispy or not) to scale its operation across multiple threads. It generates a huge amount of garbage that is held for a very long time (in GC terms), thus producing a great deal of contention on the heap between the active job threads and the GC implementation constantly having to clean up after them, compact the results, etc. The workload is not CPU-bound, so I don't see it being parallelized effectively. I'd be very interested in seeing an implementation for a runtime that proves me wrong, i.e. can attain significant performance benefits by running the e.g. 8 `burn` jobs across multiple threads. In an attempt to do just that (prove myself wrong), I thought I'd golf the `burn` program (again; onlookers can go look at the Java implementation I knocked out a few days ago here: https://gist.github.com/4682554) on Racket, presumably as well-suited to multicore list processing as any other. The results: https://gist.github.com/4682453 Please forgive my perhaps pitiful Racket-fu. I'm sure there's threadpool and CAS libraries available, but it was entertaining to hack away with the threading and semaphore primitives. If I've goofed something up badly (it's been some time since I've schemed), please speak up. The Racket and Java implementations are effectively equivalent: `java -server -Xmx2g cemerick.burn $THREAD_COUNT` (oracle java 1.7.0_09) 1 thread: 61s 2 threads: 126s `java -server -Xmx2g cemerick.burn $THREAD_COUNT` (oracle java 1.7.0_09) 1 thread: 47s 2 threads: 92s `time ./racket -t ~/burn.scm -m $THREAD_COUNT` (racket 5.3.1) 1 thread: 45s 2 threads: 126s The above was run on OS X 10.7.5 with 4GB of physical memory. If someone knows of ways to get better perf on racket, let me know. I tried running from the results of `raco make` and such, but saw no improvements; I guess it is strictly producing bytecode that is later JIT'ed, and not doing any kind of additional AOT optimizations... It'd be interesting to see timings from different operating systems, and very interesting to see timings from running burn.scm on other schemes, or a Common Lisp implementation and timings. Cheers, - Chas On Jan 30, 2013, at 9:20 PM, Lee Spector wrote: FYI we had a bit of a discussion about this at a meetup in Amherst MA yesterday, and while I'm not sufficiently on top of the JVM or system issues to have briefed everyone on all of the details there has been a little of followup since the discussion, including results of some different experiments by Chas Emerick, at: http://www.meetup.com/Functional-Programming-Connoisseurs/messages/boards/thread/30946382 -Lee On Jan 30, 2013, at 8:39 PM, Marshall Bockrath-Vandegrift wrote: Apologies for my very-slow reply here. I keep thinking that I’ll have more time to look into this issue, and keep having other things requiring my attention. And on top of that, I’ve temporarily lost the many-way AMD system I was using as a test-bed. I very much want to see if I can get my hands on an Intel system to compare to. My AMD system is in theory 32-way – two physical CPUs, each with 16 cores. However, Linux reports (via /proc/cpuinfo) the cores in groups of 8 (“cpu cores : 8” etc). And something very strange happens when extending parallelism beyond 8-way... I ran several experiments using a version of your whole-application benchmark I modified to control the level of parallelism. At parallelism 9+, the real time it takes to complete the benchmark hardly budges, but the user/CPU time increases linearly with the level of parallelism! As far as I can tell, multi-processor AMD *is* a NUMA architecture, which might potentially explain things. But enabling the JVM NUMA options doesn’t seem to affect the benchmark. I think next steps are two-fold: (1) examine parallelism vs real CPU time on an Intel system, and (2) attempt to reproduce the observed behavior in pure Java. I’m keeping my fingers crossed that I’ll have some time to look at this more soon, but I’m honestly not very hopeful. In the mean time, I hope you’ve managed to exploit multi-process parallelism to run more efficiently? -Marshall -- -- You received this message because you are subscribed
Clojure 1.5 RC 4 wants to be Clojure 1.5
Clojure 1.5 RC 4 is now available via Maven Central: http://search.maven.org/#search%7Cga%7C1%7Cg%3A%22org.clojure%22%20AND%20a%3A%22clojure%22%20AND%20v%3A1.5.0* Please test 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 --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: multicore list processing (was Re: abysmal multicore performance, especially on AMD processors)
Chas Emerick c...@cemerick.com writes: Keeping the discussion here would make sense, esp. in light of meetup.com's horrible discussion board. Excellent. Solves the problem of deciding the etiquette of jumping on the meetup board for a meetup one has never been involved in. :-) The nature of the `burn` program is such that I'm skeptical of the ability of any garbage-collected runtime (lispy or not) to scale its operation across multiple threads. Bringing you up to speed on this very long thread, I don’t believe the original `burn` benchmark is a GC issue, due to results cameron first reported here: https://groups.google.com/d/msg/clojure/48W2eff3caU/83uXZjLi3iAJ I that narrowed to what I still believe to be the explanation here: https://groups.google.com/d/msg/clojure/48W2eff3caU/jd8dpmzEtEYJ And have more compact demonstration benchmark results here: https://groups.google.com/d/msg/clojure/48W2eff3caU/tCCkjXxTUMEJ I haven’t been able to produce those results in a minimal Java-only test case, though. Then Wm. Josiah posted a full-application benchmark, which appears to have entirely different performance problems from the synthetic `burn` benchmark. I’d rejected GC as the cause for the slowdown there too, but ATM can’t recall why or what I tested, so GC may definitely be a candidate to re-examine: https://groups.google.com/d/msg/clojure/48W2eff3caU/K224Aqwkn5YJ Quite looking forward to additional insight... -Marshall -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: is intellij idea a good ide for clojure development?
2013/1/31 Niels van Klaveren niels.vanklave...@gmail.com: Another vote for Eclipse/CCW over Netbeans and IntelliJ. I used all three, and CCW's development has proven to be consistently better than plugins for the other IDE's. Both CCW's excellent Leiningen and REPL support, as the option to link projects when working on multiple sources at the same time have proven to be indispensable. As for Emacs, in my opinion you'd best get a good grip on Clojure development before taking on the whole new learning curve Emacs will pose. CCW's `strict` mode is almost on par with Emacs paredit, and will be when Barf/Slurp are introduced in the not too distant future. which will in fact be the next release, since Tom Hickey added it and the push request has been issued ! On Monday, January 28, 2013 12:37:54 PM UTC+1, HamsterofDeath wrote: the only ides i have used so far for clojure are intellij idea and netbeans. is there one that is a lot better? if yes, why? i am not interested in details or single features, i just want to know if there is some magic editor out there that i should look into because it is *obviously a lot* better - like in you should use an ide for java development instead of notepad -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: multicore list processing (was Re: abysmal multicore performance, especially on AMD processors)
On Jan 31, 2013, at 9:23 AM, Marshall Bockrath-Vandegrift wrote: Chas Emerick c...@cemerick.com writes: The nature of the `burn` program is such that I'm skeptical of the ability of any garbage-collected runtime (lispy or not) to scale its operation across multiple threads. Bringing you up to speed on this very long thread, I don’t believe the original `burn` benchmark is a GC issue, due to results cameron first reported here: https://groups.google.com/d/msg/clojure/48W2eff3caU/83uXZjLi3iAJ I that narrowed to what I still believe to be the explanation here: https://groups.google.com/d/msg/clojure/48W2eff3caU/jd8dpmzEtEYJ And have more compact demonstration benchmark results here: https://groups.google.com/d/msg/clojure/48W2eff3caU/tCCkjXxTUMEJ I haven’t been able to produce those results in a minimal Java-only test case, though. Then Wm. Josiah posted a full-application benchmark, which appears to have entirely different performance problems from the synthetic `burn` benchmark. I’d rejected GC as the cause for the slowdown there too, but ATM can’t recall why or what I tested, so GC may definitely be a candidate to re-examine: https://groups.google.com/d/msg/clojure/48W2eff3caU/K224Aqwkn5YJ Quite looking forward to additional insight... Yeah, the thread is far too large for me to reasonably digest (and there's inevitably a lot of noise in rounds of microbenchmarking golf ;-) BTW, I just realized I copy/pasted the wrong command for the faster of the Java implementation benchmarks in the previous mail; it used -XX:-UseParallelGC: `java -server -Xmx2g -XX:-UseParallelGC cemerick.burn $THREAD_COUNT` I've not looked at clojush at all; it is AFAICT a complex application in its own right, and I wouldn't know where to start. My understanding is that the `burn` function is considered representative of the bulk of operations in clojush, but I'm happy to assume that that's not the case. There's likely a number of things that go into the results of the `burn` benchmark, nevermind the apparent performance of clojush. Here's what I know: * Two separate implementations (Java and Racket) exhibit very similar multicore performance characteristics. In particular, the Java implementation would not suffer from any particular megamorphic inefficiencies, since no such calls are made in that program. Racket is far more of a black box to me than the JVM, but it does not provide much of any polymorphism at all, so JIT-related issues are presumably not in scope there. * Broadly speaking, heap allocation and its evil twin, GC, sabotages parallelism and performance in general. Functional programming with immutable values has been made possible in large part by the gains registered by persistent data structures, structural sharing, lazy evaluation, and so on; without them, we're back to copy-on-write, which is roughly what `burn` represents in grand style. Now, all this digital ink spilled, and just for kicks, I go back to run the Clojure `burn` again (https://gist.github.com/4683413 in a 1.5.0-RC2 REPL started with jvm args of `-Xmx2g -XX:-UseParallelGC`): 1 thread: 38s 2 threads: 32s 4 threads: 23s Hardly a 2x or 4x improvement, but I had previously obtained badly degrading timings corresponding to those in my previous mail. Microbenchmarking sucks. At least I got to twiddle with Racket again. :-P Cheers, - 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 --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
ANN Spyglass 1.1.0-beta2
Spyglass is a very fast Clojure client for Memcached (as well as Couchbase and Kestrel) built on top of SpyMemcached. Release notes: http://blog.clojurewerkz.org/blog/2013/01/31/spyglass-1-dot-1-0-beta2-is-released/ -- MK http://github.com/michaelklishin http://twitter.com/michaelklishin -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: GSOC 2013 projects?
I would really like to try to participate this year too. I was thinking about porting ClojureScript to ErlangVM (BEAM); not in fully compatible with standard JS-CLJS way, I think, but at least as an alternative language for BEAM. There is a clear lack of decent language for hard problems now in Erlang ecosystem; I'm not sure if this is a solution, but maybe CLJS over BEAM can be a way to go. On Thursday, January 31, 2013 1:35:58 AM UTC+4, Omer Iqbal wrote: Hey folks, Even though it hasn't been announced yet, I was wondering about project ideas for this year's GSOC. I was looking at a few projects from last year, which seemed pretty interesting. Is there any official list btw? *I'm rather enthusiastic about taking part this summer :D* (cheers) Omer -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: screencast: friend and creating a login form
Wow, this is great. And it came just in time, as I want to use compojure + friend + an account chooser (accountchooser.com). Account Chooser uses OpenID in the background, so hopefully I can use that friend workflow out of the box. But if anyone's had experience with friend + accountchooser, I'd love to know more. Keep up the awesome screencasts :) Tim -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: multicore list processing (was Re: abysmal multicore performance, especially on AMD processors)
On Jan 31, 2013, at 10:15 AM, Chas Emerick wrote: Then Wm. Josiah posted a full-application benchmark, which appears to have entirely different performance problems from the synthetic `burn` benchmark. I’d rejected GC as the cause for the slowdown there too, but ATM can’t recall why or what I tested, so GC may definitely be a candidate to re-examine: I've not looked at clojush at all; it is AFAICT a complex application in its own right, and I wouldn't know where to start. My understanding is that the `burn` function is considered representative of the bulk of operations in clojush, but I'm happy to assume that that's not the case. There's likely a number of things that go into the results of the `burn` benchmark, nevermind the apparent performance of clojush. FWIW I wrote the burn benchmark because lots of intensive list manipulation is at the heart of our real applications, and that seemed to be a nicely minimal way to see how that could scale across cores. Our real applications may indeed raise other issues too, but getting lots of intensive list manipulation to scale well is bound to be good. FWIW the full-application benchmark that Josiah posted was made deterministic in a way that means that big chunks of our code won't actually be executing. The system generates and interprets lots of Push programs, and if I recall correctly the benchmark hardcodes all of the Push programs to be the same constant program, meaning that not all of the Push instructions will run, etc. It'd be trickier to get the real mix of instructions in a way that makes for an easily reproducible benchmark, and this benchmark is at least testing the basic interpreter and population-level infrastructure. If we can get this to scale reasonably then we could try to see how much that helps under more-completely real conditions. -Lee -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: GSOC 2013 projects?
I helped manage the process last year. It's not a small amount of work. I don't think I have the time to put into it this year, though I'd be willing to be a mentor. Anybody want to step forward and lead that process? David On Thu, Jan 31, 2013 at 10:23 AM, Dmitry Groshev lambdadmi...@gmail.comwrote: I would really like to try to participate this year too. I was thinking about porting ClojureScript to ErlangVM (BEAM); not in fully compatible with standard JS-CLJS way, I think, but at least as an alternative language for BEAM. There is a clear lack of decent language for hard problems now in Erlang ecosystem; I'm not sure if this is a solution, but maybe CLJS over BEAM can be a way to go. On Thursday, January 31, 2013 1:35:58 AM UTC+4, Omer Iqbal wrote: Hey folks, Even though it hasn't been announced yet, I was wondering about project ideas for this year's GSOC. I was looking at a few projects from last year, which seemed pretty interesting. Is there any official list btw? *I'm rather enthusiastic about taking part this summer :D* (cheers) Omer -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Hooking into doc and source
On Jan 31, 2013, at 5:50 AM, Phillip Lord phillip.l...@newcastle.ac.uk wrote: So, I really would like to hook into the doc function so that I can return a documentation string pulled directly from the underlying Java object; I already have a function for doing this, but do not know how to get the native Clojure facilities to call this, rather than just take the documentation directly from the metadata. Could you wrap clojure.repl/print-doc using something like Robert Hooke? https://github.com/technomancy/robert-hooke Looking for 1/2-time employment as a Clojure programmer Latest book: /Functional Programming for the Object-Oriented Programmer/ https://leanpub.com/fp-oo -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
strange error: : Could not find or load main class –jar
I wrote a small Clojure app (1.4) and then bundled it up with lein uberjar. This app uses Ring and Jetty so it handles the webserver itself. On my local machine, a Macintosh, in the terminal, I can start it with: java -jar kiosk.clj 3 This works fine. I also moved to another server, running Centos, and I used yum install to install a JVM and then I again did: java -jar kiosk.clj 3 and that worked fine. Then I gave the app to the sysadmin, and he tried to spin it up on another server, and on startup he got the error: Could not find or load main class –jar What does this mean? -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: the semantic of if-let macro
The docs are clear that the test occurs before the bindings: (doc if-let) - clojure.core/if-let ([bindings then] [bindings then else oldform]) Macro bindings = binding-form test If test is true, evaluates then with binding-form bound to the value of test, if not, yields else Cheers, Stu On Thu, Jan 31, 2013 at 2:43 AM, Mimmo Cosenza mimmo.cose...@gmail.comwrote: On Thursday, January 31, 2013 1:49:40 AM UTC+1, Sean Corfield wrote: but now that you've posted this, I can see some potential for confusion when folks first encounter if-let... Presumably the same confusion could arise for when-let? yes, this is the confusion that you can incur in. mimmo -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: strange error: : Could not find or load main class –jar
This does not seem to apply: https://github.com/technomancy/leiningen/issues/739 I suspect you're missing a :gen-class declaration in src/cljmx/core.clj. But this is what I have: (ns kiosks-clojure.core (:gen-class) (:import (java.net URL) (java.io ByteArrayInputStream) (org.apache.commons.mail SimpleEmail) (org.apache.commons.mail HtmlEmail) (java.text SimpleDateFormat)) Again, this worked fine on my local machine, and also on another server that the company gave me, but when I give it to the sysadmin, he gets the error. Perhaps this has something to do with the classpath? In the past, I was always the one to install the jvm, and I ran the uberjars from my directory. But maybe something needs to be made more specific for a sysadmin to run this in any directory they like? W dniu czwartek, 31 stycznia 2013 13:06:26 UTC-5 użytkownik larry google groups napisał: I wrote a small Clojure app (1.4) and then bundled it up with lein uberjar. This app uses Ring and Jetty so it handles the webserver itself. On my local machine, a Macintosh, in the terminal, I can start it with: java -jar kiosk.clj 3 This works fine. I also moved to another server, running Centos, and I used yum install to install a JVM and then I again did: java -jar kiosk.clj 3 and that worked fine. Then I gave the app to the sysadmin, and he tried to spin it up on another server, and on startup he got the error: Could not find or load main class -jar What does this mean? -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: strange error: : Could not find or load main class –jar
More info about my problem: java version 1.7.0_11 Java(TM) SE Runtime Environment (build 1.7.0_11-b21) Java HotSpot(TM) 64-Bit Server VM (build 23.6-b04, mixed mode) W dniu czwartek, 31 stycznia 2013 13:19:34 UTC-5 użytkownik larry google groups napisał: This does not seem to apply: https://github.com/technomancy/leiningen/issues/739 I suspect you're missing a :gen-class declaration in src/cljmx/core.clj. But this is what I have: (ns kiosks-clojure.core (:gen-class) (:import (java.net URL) (java.io ByteArrayInputStream) (org.apache.commons.mail SimpleEmail) (org.apache.commons.mail HtmlEmail) (java.text SimpleDateFormat)) Again, this worked fine on my local machine, and also on another server that the company gave me, but when I give it to the sysadmin, he gets the error. Perhaps this has something to do with the classpath? In the past, I was always the one to install the jvm, and I ran the uberjars from my directory. But maybe something needs to be made more specific for a sysadmin to run this in any directory they like? W dniu czwartek, 31 stycznia 2013 13:06:26 UTC-5 użytkownik larry google groups napisał: I wrote a small Clojure app (1.4) and then bundled it up with lein uberjar. This app uses Ring and Jetty so it handles the webserver itself. On my local machine, a Macintosh, in the terminal, I can start it with: java -jar kiosk.clj 3 This works fine. I also moved to another server, running Centos, and I used yum install to install a JVM and then I again did: java -jar kiosk.clj 3 and that worked fine. Then I gave the app to the sysadmin, and he tried to spin it up on another server, and on startup he got the error: Could not find or load main class -jar What does this mean? -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: GSOC 2013 projects?
On Thu Jan 31 11:52 2013, David Nolen wrote: I helped manage the process last year. It's not a small amount of work. I don't think I have the time to put into it this year, though I'd be willing to be a mentor. Anybody want to step forward and lead that process? I'd be happy to give it a go. I thought it was a really good experience last year, and I'd love to see Clojure participate again. Sincerely, Daniel signature.asc Description: Digital signature
Re: Hooking into doc and source
phillip.l...@newcastle.ac.uk (Phillip Lord) writes: I'm build a library which provides a DSL for building ontologies. Underneath this backs onto a Java API. The library works by provide some macros, which create Java objects then intern them into the local namespace. With the documentation, I can just add this to the metadata. But there is a problem; I also need this in the underlying Java objects, so that when the ontology is serialised, all the documentation goes with it. So now I have the documentation in two places. Could you initialise the var metadata using the docstring pulled from the java object. You would probably need your macros to generate alter-var-root forms to add the metadata. Hugo -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: strange error: : Could not find or load main class –jar
Any suggestion, no matter how far fetched, will be welcome. I am ignorant about the JVM so I am having trouble debugging this problem. W dniu czwartek, 31 stycznia 2013 13:22:20 UTC-5 użytkownik larry google groups napisał: More info about my problem: java version 1.7.0_11 Java(TM) SE Runtime Environment (build 1.7.0_11-b21) Java HotSpot(TM) 64-Bit Server VM (build 23.6-b04, mixed mode) W dniu czwartek, 31 stycznia 2013 13:19:34 UTC-5 użytkownik larry google groups napisał: This does not seem to apply: https://github.com/technomancy/leiningen/issues/739 I suspect you're missing a :gen-class declaration in src/cljmx/core.clj . But this is what I have: (ns kiosks-clojure.core (:gen-class) (:import (java.net URL) (java.io ByteArrayInputStream) (org.apache.commons.mail SimpleEmail) (org.apache.commons.mail HtmlEmail) (java.text SimpleDateFormat)) Again, this worked fine on my local machine, and also on another server that the company gave me, but when I give it to the sysadmin, he gets the error. Perhaps this has something to do with the classpath? In the past, I was always the one to install the jvm, and I ran the uberjars from my directory. But maybe something needs to be made more specific for a sysadmin to run this in any directory they like? W dniu czwartek, 31 stycznia 2013 13:06:26 UTC-5 użytkownik larry google groups napisał: I wrote a small Clojure app (1.4) and then bundled it up with lein uberjar. This app uses Ring and Jetty so it handles the webserver itself. On my local machine, a Macintosh, in the terminal, I can start it with: java -jar kiosk.clj 3 This works fine. I also moved to another server, running Centos, and I used yum install to install a JVM and then I again did: java -jar kiosk.clj 3 and that worked fine. Then I gave the app to the sysadmin, and he tried to spin it up on another server, and on startup he got the error: Could not find or load main class -jar What does this mean? -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: strange error: : Could not find or load main class –jar
I am using wrap-resource instead of wrap-file. Could that cause some issues
with the path? (And, is this a path issue?)
(def app
(- app-routes
(wrap-resource public)
(wrap-session {:cookie-name timeout-discovery-session :cookie-attrs
{:max-age 1 }})
(wrap-cookies)
(wrap-keyword-params)
(wrap-nested-params)
(wrap-params)))
W dniu czwartek, 31 stycznia 2013 15:01:07 UTC-5 użytkownik larry google
groups napisał:
Any suggestion, no matter how far fetched, will be welcome. I am ignorant
about the JVM so I am having trouble debugging this problem.
W dniu czwartek, 31 stycznia 2013 13:22:20 UTC-5 użytkownik larry google
groups napisał:
More info about my problem:
java version 1.7.0_11
Java(TM) SE Runtime Environment (build 1.7.0_11-b21)
Java HotSpot(TM) 64-Bit Server VM (build 23.6-b04, mixed mode)
W dniu czwartek, 31 stycznia 2013 13:19:34 UTC-5 użytkownik larry google
groups napisał:
This does not seem to apply:
https://github.com/technomancy/leiningen/issues/739
I suspect you're missing a :gen-class declaration in src/cljmx/core.clj
.
But this is what I have:
(ns kiosks-clojure.core
(:gen-class)
(:import
(java.net URL)
(java.io ByteArrayInputStream)
(org.apache.commons.mail SimpleEmail)
(org.apache.commons.mail HtmlEmail)
(java.text SimpleDateFormat))
Again, this worked fine on my local machine, and also on another server
that the company gave me, but when I give it to the sysadmin, he gets the
error. Perhaps this has something to do with the classpath? In the past, I
was always the one to install the jvm, and I ran the uberjars from my
directory. But maybe something needs to be made more specific for a
sysadmin to run this in any directory they like?
W dniu czwartek, 31 stycznia 2013 13:06:26 UTC-5 użytkownik larry google
groups napisał:
I wrote a small Clojure app (1.4) and then bundled it up with lein
uberjar. This app uses Ring and Jetty so it handles the webserver itself.
On my local machine, a Macintosh, in the terminal, I can start it with:
java -jar kiosk.clj 3
This works fine.
I also moved to another server, running Centos, and I used yum
install to install a JVM and then I again did:
java -jar kiosk.clj 3
and that worked fine.
Then I gave the app to the sysadmin, and he tried to spin it up on
another server, and on startup he got the error:
Could not find or load main class -jar
What does this mean?
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Re: strange error: : Could not find or load main class –jar
The java command is interpreting -jar as the name of a class instead of a command-line option. Something is messed up in the way the command is executed in your sysadmin's context. On Thursday, January 31, 2013 9:01:07 PM UTC+1, larry google groups wrote: Any suggestion, no matter how far fetched, will be welcome. I am ignorant about the JVM so I am having trouble debugging this problem. W dniu czwartek, 31 stycznia 2013 13:22:20 UTC-5 użytkownik larry google groups napisał: More info about my problem: java version 1.7.0_11 Java(TM) SE Runtime Environment (build 1.7.0_11-b21) Java HotSpot(TM) 64-Bit Server VM (build 23.6-b04, mixed mode) W dniu czwartek, 31 stycznia 2013 13:19:34 UTC-5 użytkownik larry google groups napisał: This does not seem to apply: https://github.com/technomancy/leiningen/issues/739 I suspect you're missing a :gen-class declaration in src/cljmx/core.clj . But this is what I have: (ns kiosks-clojure.core (:gen-class) (:import (java.net URL) (java.io ByteArrayInputStream) (org.apache.commons.mail SimpleEmail) (org.apache.commons.mail HtmlEmail) (java.text SimpleDateFormat)) Again, this worked fine on my local machine, and also on another server that the company gave me, but when I give it to the sysadmin, he gets the error. Perhaps this has something to do with the classpath? In the past, I was always the one to install the jvm, and I ran the uberjars from my directory. But maybe something needs to be made more specific for a sysadmin to run this in any directory they like? W dniu czwartek, 31 stycznia 2013 13:06:26 UTC-5 użytkownik larry google groups napisał: I wrote a small Clojure app (1.4) and then bundled it up with lein uberjar. This app uses Ring and Jetty so it handles the webserver itself. On my local machine, a Macintosh, in the terminal, I can start it with: java -jar kiosk.clj 3 This works fine. I also moved to another server, running Centos, and I used yum install to install a JVM and then I again did: java -jar kiosk.clj 3 and that worked fine. Then I gave the app to the sysadmin, and he tried to spin it up on another server, and on startup he got the error: Could not find or load main class -jar What does this mean? -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: strange error: : Could not find or load main class –jar
larry google groups lawrencecloj...@gmail.com writes: Any suggestion, no matter how far fetched, will be welcome. I am ignorant about the JVM so I am having trouble debugging this problem. java -jar kiosk.clj 3 These are weird (.clj vs .jar), but since you say whatever you actually ran worked... Then I gave the app to the sysadmin, and he tried to spin it up on another server, and on startup he got the error: Could not find or load main class –jar I’m guessing encoding error. In fact, if that error is a direct copy-paste from either the exact error or what you sent the sysadmin, it completely explains it. Your `-` character in `-jar` above is in fact `-` (en-dash), which is causing `java` to search the classpath for a class named `–jar`. -Marshall -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
extended mode for format strings?
Looking at complicated format strings (in cl-format) such as:
~:~:@{[~25s ~30s]~:^~:@_~}~:
I'm struck with a desire to break up the string, comment it, etc. In fact, in
http://wiki.cfcl.com/bin/view/Projects/Clojure/CP_pprint, I did so:
~:~:@{[~25s ~30s]~:^~:@_~}~: ; the entire format string
~:~: ; creates a logical block
~:@{ ~} ; iterates through the vectors in the list
[ ] ; creates a pair of literal brackets
~25s ~30s; creates a pair of fixed-width columns
~:^; breaks the iteration on the last pair
~:@_; creates a mandatory newline
This works OK as an expository format, but it seems a bit picky and inflexible
(ie, placement of white space is critical). It might also be hard to parse.
Perl Regular expressions can be written in an extended mode where white space
(including comments) is ignored. Something like this might work for cl-format,
using ~w to generate white space:
(def fmt (em
~: ~:@{ ; create logical block, iterate through list
[ ~25s ~w ~30s ] ; create bracketed, fixed-width columns
~:^ ~:@_ ; break iteration, create mandatory newline
~} ~: ; close out iteration and logical block
))
However, I'm not convinced that this is the ideal syntax. Suggestions?
-r
--
http://www.cfcl.com/rdmRich Morin
http://www.cfcl.com/rdm/resume r...@cfcl.com
http://www.cfcl.com/rdm/weblog +1 650-873-7841
Software system design, development, and documentation
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Re: strange error: : Could not find or load main class –jar
java -jar kiosk.clj 3 These are weird (.clj vs .jar), but since you say whatever you actually ran worked... Apologies. I re-typed and stupidly typed clj. But what I sent to the sysadmin was a copy and paste of what I had used in my terminal to get the app running. I like your idea about the encoding error. He is about to test that idea. W dniu czwartek, 31 stycznia 2013 15:16:37 UTC-5 użytkownik Marshall Bockrath-Vandegrift napisał: larry google groups lawrenc...@gmail.com javascript: writes: Any suggestion, no matter how far fetched, will be welcome. I am ignorant about the JVM so I am having trouble debugging this problem. java -jar kiosk.clj 3 These are weird (.clj vs .jar), but since you say whatever you actually ran worked... Then I gave the app to the sysadmin, and he tried to spin it up on another server, and on startup he got the error: Could not find or load main class -jar I'm guessing encoding error. In fact, if that error is a direct copy-paste from either the exact error or what you sent the sysadmin, it completely explains it. Your `-` character in `-jar` above is in fact `-` (en-dash), which is causing `java` to search the classpath for a class named `-jar`. -Marshall -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: strange error: : Could not find or load main class –jar
I'm guessing encoding error. In fact, if that error is a direct copy-paste from either the exact error or what you sent the sysadmin, it completely explains it. Your `-` character in `-jar` above is in fact `-` (en-dash), which is causing `java` to search the classpath for a class named `-jar`. Good lord, you were correct! We re-typed it at the terminal and everything worked great. Very perceptive, that you figured that out. I would not have guessed that error even if I had one million years to figure out the problem. W dniu czwartek, 31 stycznia 2013 15:16:37 UTC-5 użytkownik Marshall Bockrath-Vandegrift napisał: larry google groups lawrenc...@gmail.com javascript: writes: Any suggestion, no matter how far fetched, will be welcome. I am ignorant about the JVM so I am having trouble debugging this problem. java -jar kiosk.clj 3 These are weird (.clj vs .jar), but since you say whatever you actually ran worked... Then I gave the app to the sysadmin, and he tried to spin it up on another server, and on startup he got the error: Could not find or load main class -jar I'm guessing encoding error. In fact, if that error is a direct copy-paste from either the exact error or what you sent the sysadmin, it completely explains it. Your `-` character in `-jar` above is in fact `-` (en-dash), which is causing `java` to search the classpath for a class named `-jar`. -Marshall -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
clojure web developer job offer
Our company is looking for a full time or consultant developer. The job is to maintain and continue actively develop web application / internal webservices written in clojure. We use compojure web framework, darcs for repository. Remote work via ssh is ok. Haskell knowledge is a big plus. We have internal web services written in haskell. We are located in San Dimas, CA. But relocation is not necessary. Requirements: good grasp of functional programming, at least one year of production coding with clojure or haskell. Contact me if intrested. -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
(into [] (take n v)) vs (subvec v 0 n)
In the app I am working on, I have a number of pre-computed,cached collections, and for each collection, I have an accessor function that returns either the entire collection or the first n elements. Currently the underlying collection is a vector, so I had something like this: (defn foo-accessor ([] foo-vector) ([n] (take n foo-vector))) It occurred to me that take returns a list, and so the type returned by my accessor was dependent on how it was called, I thought I would change that, and remembered subvec, so I substituted in subvec for take, like this: ([n] (subvec foo-vector 0 n)) That worked great until ( (count foo-vector) n), and I got an IndexOutOfBoundsException So, then without thinking much, I wrote (defn subvec-safe subvec fails if you specify an end that is greater than count. This version checks that, and DoesTheRightThing! ([v start] (subvec v start)) ([v start end] (if ( (count v) end) (subvec v start end) (subvec v start (count v) (Yes, it is safe ONLY for the end value…) And (defn takev take for a vector, returns a subvec or the vector itself. Uses subvec-safe so specifying a n longer than (count v) works [n vec] (subvec-safe vec 0 n)) Even before finishing takev, it occurred to me that (defn- takev take for a vector [n vec] (into [] (take n vec))) Might be easier/faster. subvec returns a clojure.lang.APersistentVector$SubVector whereas (into [] (take …)) returns a vector. Any thoughts on which of the above is better? Thanks, Don -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
How to solve Collatz Conjecture problem for huge numbers using clojure parallelism tricks?
The problem is known as Collatz Conjecture (also 3n + 1 conjecture).
Basically given a n number then you apply the following rule.
If n is even then n/2 otherwise 3 * n + 1, you keep applying this until you
reach the number 1.
For instance, starting with *n = 6*, one gets the sequence 6, 3, 10, 5, 16, 8,
4, 2, 1. (with *8 items*)
Now the challenge tell the *n* with n descending from 100 to 1 and with the
*greater number of items*.
Then I did the program bellow (I'm very happy for feedback since I'm totally
noobie to clj), but it takes forever, there is anyway to make it fast?
(defn- apply-collatz-conjecture
Given n, it returns n/2 if it's even or n*3+1 if it's odd.
[n]
(if (even? n)
(/ n 2)
(+ (* 3 n) 1)))
(defn- collatz-conjecture-seq
Given n, it returns the sequence of collatz-conjecture.
[n]
(loop [n n sequence []]
(if (not= n 1)
(recur (apply-collatz-conjecture n) (cons
(apply-collatz-conjecture n) sequence))
(reverse sequence
(defn- collatz-conjecture-number-of-items
It returns a map with n and number of items on its collatz-conjecture
sequence.
[n]
{ :n n :count (count (collatz-conjecture-seq n)) } )
(defn- greater
Given x and y, it returns the element with greater count.
[x y]
(if ( (:count x) (:count y))
x
y))
(defn n-with-more-items
Given n, it applies collatz-conjecture for the range 1..n
and return the n with more items.
[n]
(reduce greater (pmap collatz-conjecture-number-of-items (range 1 n
The only thing I thought was use pmap but it didn't make it super fast.
*Using only map*
user= (time (n-with-more-items 99))
Elapsed time: *21191.762883 msecs*
{:n 837799, :count 524}
*Using pmap*
user= (time (n-with-more-items 99))
Elapsed time: *13230.919979 msecs*
{:n 837799, :count 524}
Any thoughts on how can I apply parallelism to solve this (especially on
my frustrate try of use map and reduce)?
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Re: *read-eval* vulnerability
On Jan 30, 2013, at 5:59 PM, Michał Marczyk wrote: On 30 January 2013 23:32, Chas Emerick c...@cemerick.com wrote: On Jan 30, 2013, at 12:23 PM, Michael Fogus wrote: RuntimeException EvalReader not allowed when *read-eval* is false. The problem is that the second eval gets (the actual + function 1 2 3) which invokes the right pathway triggering the exception. You can trigger the same exception by: (binding [*read-eval* false] (eval (list + 1 2 3))) Re-reading this, I'm clearly not grokking something here. Maybe I'm having a slow afternoon; send help. :-P This obviously ends up running through EvalReader — but why? How is LispReader ever involved at all? I believe the story goes like so: The eval call here compiles a list of a function object and three numbers. The function object gets compiled to code which effectively calls readString on #=(clojure.core$_PLUS_. ). (It so happens that print-dup knows how to handle functions; if it didn't, an exception would be thrown during compilation with the message Can't embed object in code, maybe print-dup not defined: ) When the compiled code is executed, readString gets called to reconstruct the function, and since *read-eval* is false, this fails. Whoo, sneaky. If only fns carried (most of) the metadata that their originating vars were defined with, print-dup would be able to emit a fully-qualified symbol instead of that bonkers ctor call...I think. This explains why my plan for a nuclear option for fixing *read-eval*'s default doesn't work when outside of a bare `java -cp ... clojure.main` REPL: https://gist.github.com/4674181 Much of the initialization of the nREPL / Leiningen / Reply toolchain involves evaluating code that's been prn'ed, and there may very well be a couple of nested `eval` usages lurking in there similar to what Fogus raised. So, getting *read-eval* to a safe default is going to require more than just setting its default to false; all usages of #= in https://github.com/clojure/clojure/blob/master/src/clj/clojure/core_print.clj need to be eliminated. Will be peeking at that next... - 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 --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Installing Clojure on Windows 7
meant to say in my post entitled instructions for windows 7 to install clojure - leiningen - eclipse - counterclockwise: if Ctrl (not Cmd) Enter does not work in windows 7 try: Ctrl Alt S when done don't forget to restart after re-enabling your firewall and UAC (otherwise UAC will remain off and your hair will catch fire) also, i suppose java knows very well what to do with the windows default folder name Program Files (x86) which requires spaces in its pathway: C:\Program Files (x86) and expect changing it will also spontaneously combust your hair. On Thursday, January 24, 2013 12:56:59 PM UTC-5, sampso...@googlemail.com wrote: Apparently installing a development environment for Clojure on Windows 7 is very difficult. What is the best way, that has a chance that it might work? -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: How to solve Collatz Conjecture problem for huge numbers using clojure parallelism tricks?
Take a look at this gist:
https://gist.github.com/4688693
It uses memoize to eek out a little bit more performance.
λ ~/Projects/experiments/collatz lein run
Compiling collatz.core
[9 19]
Elapsed time: 30.236 msecs
[97 118]
Elapsed time: 5.532 msecs
[871 178]
Elapsed time: 22.529 msecs
[6171 261]
Elapsed time: 114.061 msecs
[77031 350]
Elapsed time: 578.955 msecs
[837799 524]
Elapsed time: 3686.937 msecs
[8400511 685]
Elapsed time: 40478.64 msecs
On my machine it is usually significantly faster than when I run the
provided code:
λ ~/Projects/experiments/collatz lein run
Compiling collatz.core
{:n 9, :count 19}
Elapsed time: 22.024 msecs
{:n 97, :count 118}
Elapsed time: 6.838 msecs
{:n 871, :count 178}
Elapsed time: 56.313 msecs
{:n 6171, :count 261}
Elapsed time: 293.266 msecs
{:n 77031, :count 350}
Elapsed time: 962.113 msecs
{:n 837799, :count 524}
Elapsed time: 9529.107 msecs
λ ~/Projects/experiments/collatz lein run
Compiling collatz.core
{:n 9, :count 19}
Elapsed time: 28.077 msecs
{:n 97, :count 118}
Elapsed time: 8.1 msecs
{:n 871, :count 178}
Elapsed time: 31.023 msecs
{:n 6171, :count 261}
Elapsed time: 144.956 msecs
{:n 77031, :count 350}
Elapsed time: 944.857 msecs
{:n 837799, :count 524}
Elapsed time: 10030.467 msecs
{:n 8400511, :count 685}
Elapsed time: 113490.494 msecs
Of course, there is a bunch of optimizations you can take mathematically:
http://en.wikipedia.org/wiki/Collatz_conjecture
-Zack
On Friday, February 1, 2013 4:29:53 AM UTC+4, Leandro Moreira wrote:
The problem is known as Collatz Conjecture (also 3n + 1 conjecture).
Basically given a n number then you apply the following rule.
If n is even then n/2 otherwise 3 * n + 1, you keep applying this until you
reach the number 1.
For instance, starting with *n = 6*, one gets the sequence 6, 3, 10, 5, 16,
8, 4, 2, 1. (with *8 items*)
Now the challenge tell the *n* with n descending from 100 to 1 and with
the *greater number of items*.
Then I did the program bellow (I'm very happy for feedback since I'm totally
noobie to clj), but it takes forever, there is anyway to make it fast?
(defn- apply-collatz-conjecture
Given n, it returns n/2 if it's even or n*3+1 if it's odd.
[n]
(if (even? n)
(/ n 2)
(+ (* 3 n) 1)))
(defn- collatz-conjecture-seq
Given n, it returns the sequence of collatz-conjecture.
[n]
(loop [n n sequence []]
(if (not= n 1)
(recur (apply-collatz-conjecture n) (cons
(apply-collatz-conjecture n) sequence))
(reverse sequence
(defn- collatz-conjecture-number-of-items
It returns a map with n and number of items on its collatz-conjecture
sequence.
[n]
{ :n n :count (count (collatz-conjecture-seq n)) } )
(defn- greater
Given x and y, it returns the element with greater count.
[x y]
(if ( (:count x) (:count y))
x
y))
(defn n-with-more-items
Given n, it applies collatz-conjecture for the range 1..n
and return the n with more items.
[n]
(reduce greater (pmap collatz-conjecture-number-of-items (range 1 n
The only thing I thought was use pmap but it didn't make it super fast.
*Using only map*
user= (time (n-with-more-items 99))
Elapsed time: *21191.762883 msecs*
{:n 837799, :count 524}
*Using pmap*
user= (time (n-with-more-items 99))
Elapsed time: *13230.919979 msecs*
{:n 837799, :count 524}
Any thoughts on how can I apply parallelism to solve this (especially on
my frustrate try of use map and reduce)?
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Re: Prismatic Plumbing and Graph Open-Source Release
The video of the talk on Graph from Strange Loop just came out: http://www.infoq.com/presentations/Graph-Clojure-Prismatic On Tuesday, January 29, 2013 12:46:54 PM UTC-6, Aria Haghighi wrote: Hey all, Prismatic has open-sourced our Plumbing and Graph library on githubhttps://github.com/prismatic/plumbing. Jason Wolfe gave a talkhttp://blog.getprismatic.com/blog/2012/10/1/prismatics-graph-at-strange-loop.htmlabout how we use graph for systems composition at Strange loop last year. Please give the library a whirl and let us know if you're using it and if you find any issues or feature requests. We use this library very heavily throughout our code and hope others find it useful as well. Best, Aria -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Prismatic Plumbing and Graph Open-Source Release
if you put that on youtube, let me know, currently I cannot see the slides or they are simply stuck on the first slide and never change (the video works though) On Fri, Feb 1, 2013 at 5:31 AM, Alex Miller a...@puredanger.com wrote: The video of the talk on Graph from Strange Loop just came out: http://www.infoq.com/presentations/Graph-Clojure-Prismatic On Tuesday, January 29, 2013 12:46:54 PM UTC-6, Aria Haghighi wrote: Hey all, Prismatic has open-sourced our Plumbing and Graph library on githubhttps://github.com/prismatic/plumbing. Jason Wolfe gave a talkhttp://blog.getprismatic.com/blog/2012/10/1/prismatics-graph-at-strange-loop.htmlabout how we use graph for systems composition at Strange loop last year. Please give the library a whirl and let us know if you're using it and if you find any issues or feature requests. We use this library very heavily throughout our code and hope others find it useful as well. Best, Aria -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- Please correct me if I'm wrong or incomplete, even if you think I'll subconsciously hate 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 --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Prismatic Plumbing and Graph Open-Source Release
Try Firefox. ~BG On Fri, Feb 1, 2013 at 10:08 AM, AtKaaZ atk...@gmail.com wrote: if you put that on youtube, let me know, currently I cannot see the slides or they are simply stuck on the first slide and never change (the video works though) On Fri, Feb 1, 2013 at 5:31 AM, Alex Miller a...@puredanger.com wrote: The video of the talk on Graph from Strange Loop just came out: http://www.infoq.com/presentations/Graph-Clojure-Prismatic On Tuesday, January 29, 2013 12:46:54 PM UTC-6, Aria Haghighi wrote: Hey all, Prismatic has open-sourced our Plumbing and Graph library on github. Jason Wolfe gave a talk about how we use graph for systems composition at Strange loop last year. Please give the library a whirl and let us know if you're using it and if you find any issues or feature requests. We use this library very heavily throughout our code and hope others find it useful as well. Best, Aria -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- Please correct me if I'm wrong or incomplete, even if you think I'll subconsciously hate 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 --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- Baishampayan Ghose b.ghose at gmail.com -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
AW: (into [] (take n v)) vs (subvec v 0 n)
Hi, how about simply doing this: (defn foo-accessor ([] foo-vector) ([n] (subvec foo-vector 0 (min n (count foo-vector) I wouldn't worry too much about subvectors. Unless you identify them as a bottleneck with the profiler. Kind regards Meikel Durch MOTOBLUR™ verbunden -Ursprüngliche Nachricht- Von: Don Jackson cloj...@clark-communications.com An: clojure@googlegroups.com clojure@googlegroups.com Gesendet: Fr, 01 Feb 2013, 01:23:36 MEZ Betreff: (into [] (take n v)) vs (subvec v 0 n) In the app I am working on, I have a number of pre-computed,cached collections, and for each collection, I have an accessor function that returns either the entire collection or the first n elements. Currently the underlying collection is a vector, so I had something like this: (defn foo-accessor ([] foo-vector) ([n] (take n foo-vector))) It occurred to me that take returns a list, and so the type returned by my accessor was dependent on how it was called, I thought I would change that, and remembered subvec, so I substituted in subvec for take, like this: ([n] (subvec foo-vector 0 n)) That worked great until ( (count foo-vector) n), and I got an IndexOutOfBoundsException So, then without thinking much, I wrote (defn subvec-safe subvec fails if you specify an end that is greater than count. This version checks that, and DoesTheRightThing! ([v start] (subvec v start)) ([v start end] (if ( (count v) end) (subvec v start end) (subvec v start (count v) (Yes, it is safe ONLY for the end value…) And (defn takev take for a vector, returns a subvec or the vector itself. Uses subvec-safe so specifying a n longer than (count v) works [n vec] (subvec-safe vec 0 n)) Even before finishing takev, it occurred to me that (defn- takev take for a vector [n vec] (into [] (take n vec))) Might be easier/faster. subvec returns a clojure.lang.APersistentVector$SubVector whereas (into [] (take …)) returns a vector. Any thoughts on which of the above is better? Thanks, Don -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: How to solve Collatz Conjecture problem for huge numbers using clojure parallelism tricks?
Running through this problem I also faced the weird situation, so:
Given two maps
(def mario {:color red :power 45})
(def luigi {:color green :power 40})
I want the max between both but based on :power key.
It would be something like this.
(max mario luigi)
I expect max return not only 45 but the whole map Is there any built in
function for that?
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Re: Prismatic Plumbing and Graph Open-Source Release
Thanks, I am already using it v 19.0, at one time I was unable to see any videos on infoq but then I realized that's because I perma-denied*flash*.exe *outgoing in firewall but as soon as I upgraded flash the newly named exe trying outgoing made the firewall prompt me and realized that's why some flash-based things weren't working before (like sites that allow free uploading images). In truth if I ran firefox without any addons it would probably work on infoq ... even though I did my best to allow all needed in noscript+requestpolicy+refcontrol (addons)... On Fri, Feb 1, 2013 at 5:39 AM, Baishampayan Ghose b.gh...@gmail.comwrote: Try Firefox. ~BG On Fri, Feb 1, 2013 at 10:08 AM, AtKaaZ atk...@gmail.com wrote: if you put that on youtube, let me know, currently I cannot see the slides or they are simply stuck on the first slide and never change (the video works though) On Fri, Feb 1, 2013 at 5:31 AM, Alex Miller a...@puredanger.com wrote: The video of the talk on Graph from Strange Loop just came out: http://www.infoq.com/presentations/Graph-Clojure-Prismatic On Tuesday, January 29, 2013 12:46:54 PM UTC-6, Aria Haghighi wrote: Hey all, Prismatic has open-sourced our Plumbing and Graph library on github. Jason Wolfe gave a talk about how we use graph for systems composition at Strange loop last year. Please give the library a whirl and let us know if you're using it and if you find any issues or feature requests. We use this library very heavily throughout our code and hope others find it useful as well. Best, Aria -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- Please correct me if I'm wrong or incomplete, even if you think I'll subconsciously hate 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 --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- Baishampayan Ghose b.ghose at gmail.com -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- Please correct me if I'm wrong or incomplete, even if you think I'll subconsciously hate 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 --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Efficient idioms to handle large lists?
Hello, everyone. I'm experience some performance issue when using clojure. The scenario is as follows: I have a huge list of xls files to process. I used the org.clojars.boechat107/cloxls to read the files which for each file generates a list(approximately 65,000 elements). Now I need to concatenate all of them. I used (mapcat read-worksheet files) to get the final list, but it soon reports out of heap space. Then I tried to use mutable structures: (doseq [f files] (swap! sheet concat (read-worksheet f))) where sheet is defined as (def sheet (atom []))) But the concat seems to slow down a lot when the list grows larger. I'm wondering if in clojure there is some efficient idiom to handle such situation such as efficient concatenation? Thanks, Bruce Li -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
