Re: introspecting types and records
The field names and order in the constructor will always match the values specified in deftype (excepting certain character issues, such as turning a dash into an underscore). Introspecting is easy enough: user= (deftype foo [bar baz]) user.foo user= (map #(.getName %) (.getDeclaredFields foo)) (bar baz) Though defrecord emits quite a few more fields beyond what was specified. On Jun 7, 3:55 pm, Chris Kent cjk...@gmail.com wrote: Hi Is there a way to introspect types defined with deftype and defrecord? I'd just like to know the field names and their order in the constructor. Java reflection works fine but requires some fiddling around to filter the static fields and __meta and __extmap. It feels like something that someone has probably aready done. Also, is it safe to rely on the order the fields are returned from the class? They are in the same order as in defrecord and the constructor but I'm not sure if this by design or an implementation detail of my particular JVM. Thanks Chris -- You 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: Lein deps failure
Indeed. This was a helpful resource, for those in the future that face a similar issue and are not familiar with Java packaging: http://github.com/technomancy/leiningen/blob/master/INTRO.md On Mon, Jun 7, 2010 at 3:20 PM, Meikel Brandmeyer m...@kotka.de wrote: Hi, Am 07.06.2010 um 21:20 schrieb Brian Troutwine: Why does this work? change [org.clojure/swank-clojure 1.2.1] = [swank-clojure 1.2.1] Each dependency has a group and an artifact name. org.clojure/swank-clojure means group org.clojure and artifact swank-clojure. swank-clojure is a short hand notation for swank-clojure/swank-clojure. So it works, because you look in the right place. ;) 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 -- You 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
Broken Link in Clojure Contrib Docs
Hello all, Not sure where to report this but I noticed a broken link when taking a look at the docs for sql in Clojure Contrib. http://richhickey.github.com/clojure-contrib/sql-api.html The link for Example code points here: http://code.google.com/p/clojure-contrib/source/browse/trunk/src/clojure/contrib/sql/test.clj Which is no longer around. If I'm reporting this in the wrong place then please let me know and I'll move the post. Cheers, Daniel -- You 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: Complex type in clojure
These notation arguments are compelling. On Jun 5, 8:17 pm, Travis Hoffman travis.a.hoff...@gmail.com wrote: Konrad, Thanks, I'll look at that... I should warn that my changes don't quite seem to be working, there's something running amuck in the code yet that I'm still working on debugging, but the core is a bit mystifying. Also, it seems more elegant to me to be able to simply write a complex number in a natural way i.e. 5+3i. I didn't see a way to do that without modifying clojure core No. But I wonder if 5+3i is very natural for a language that doesn't have infix arithmetic. This notation is just a sum of a real and an imaginary number, so in Clojure I'd expect to see (+ 5 3i) instead. Konrad, I see your point, but it seems that Rich has chosen a less lisp purist perspective on this. Please consider the following examples: (class (/ 3 4)) ; legal (class 3/4) ; legal (class 3 / 4) ; illegal (class 3/ 4) ; illegal (class 3 /4) ; illegal (class 1.234e+14) ; legal (class 1.234e-14) ; legal (class 1.234 e-14) ; illegal (class 1.234e -14) ; illegal (class 1.234 e -14) ; illegal It seems to be that Rich has the perspective that a Ratio's toString() output is also valid input as well, even though this appears to be an infix notated '/'. What I'm proposing is that a number ending with 'i' is imaginary or complex, and that a '+' with no spaces may be used to define a complex I think the 3+5i form makes more sense *because* there isn't infix notation in the language. Please also consider the example of an exponentiated double. It's permissible to have a '+' or a '-' in the middle of that number, but it isn't to be confused with an infixed '+' operation. What trouble? I need to reinvestigate what the trouble was. Maybe it was in the complexity of parsing, or simply because Rich used BigInteger in Ratio. I'll get back to you on that one! Perhaps a good compromise would be to have a thin Clojure wrapper around a good Java library. This is what I was thinking too. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com 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: SLIME REPL clojure completion
On 7 June 2010 16:52, Rick Moynihan rick.moyni...@gmail.com wrote: On 7 June 2010 16:35, Phil Hagelberg p...@hagelb.org wrote: On Mon, Jun 7, 2010 at 5:41 AM, Rick Moynihan rick.moyni...@gmail.com wrote: I've just updated slime to 20100404 in ELPA, and I've noticed that tab completion in the REPL buffer has stopped working. Pressing TAB to complete a symbol prints No dynamic expansion for `user foo' found. Any ideas how to get this working again? There are a couple functions needed for slime support that got moved to clojure-mode. Are you running version 1.7.1? Yes... it's also the ELPA installed version, along with clojure-test-mode 1.4. I'm also using swank-clojure 1.1.0 from ELPA, though am I right in thinking that I dont need this as I use swank via lein/mvn and slime-connect? Anymore ideas on this? Oddly I seem to get completion occaisionally, but not for example on java classes, e.g. user java.lang.StrTAB No dynamic expansion for `user java.lang.Str' found. R. -- You 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
Opposite to bean?
Hi! We have function bean which takes POJO and returns read-only map with values. How about opposite function? It would be nice to have function like: (defmacro unbean ([^Class class-name map-of-fields-and-values omit-fields] ... ) ([^Object obj-ref map-of-fields-and-values omit-fields] ... ) ) Which would take classname symbol or object, map of fieldname - its values (for example the result from bean) and fields to omit (for example field to omit because it has an ID set by a database or reference to heavy object initialized with side-effecting method call). With classname the no-arg constructor had to be called for object reference. Any ideas? -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: mapping a collection and a transposed collection of collections
That's perfect - Thanks! On Jun 7, 11:43 am, ataggart alex.tagg...@gmail.com wrote: (map list x (apply map list y)) On Jun 6, 5:51 am, Eugen Dück eu...@dueck.org wrote: Suppose I have two collections: (def x [1 2]) (def y [[\a \b] [\d \e] [\f \g]]) And want to iterate over them in the following manner: user= (map list x (transpose y)) ((1 (\a \d \f)) (2 (\b \e \g))) Where this is the transpose fn: (defn transpose [in] (partition (count in) (apply interleave in))) Is there any other nice way to do this without relying on some home- grown fn? Cheers Eugen -- You 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: RFC: clj-ds Clojure data structure for Java (et al.)
On Tue, Jun 8, 2010 at 14:34, Krukow karl.kru...@gmail.com wrote: I would like to hear the groups opinion before (and if) I release this to the general public. http://github.com/krukow/clj-ds README: ... *WHY* First, I love Clojure :) ... Unfortunately sometimes clients require that I use Java... The data structures used in the Clojure programming language are a great implementation of a number of useful persistent data structures (see e.g., the section on immutable data structures on http://clojure.org/functional_programming). ... Yes please! One nit: you probably didn't mean to check in your build products. The classes directory is full of *.class files. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Broken Link in Clojure Contrib Docs
Fixed in the repos, thanks. Will show up in docs shortly. Stu Hello all, Not sure where to report this but I noticed a broken link when taking a look at the docs for sql in Clojure Contrib. http://richhickey.github.com/clojure-contrib/sql-api.html The link for Example code points here: http://code.google.com/p/clojure-contrib/source/browse/trunk/src/clojure/contrib/sql/test.clj Which is no longer around. If I'm reporting this in the wrong place then please let me know and I'll move the post. Cheers, Daniel -- You 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: Complex type in clojure
On 8 jun, 05:47, Daniel doubleagen...@gmail.com wrote: These notation arguments are compelling. I'm not convinced. The notation would only work for literals, and how often would one write literal complex numbers? For non-literals the notation would need to support this: (* (my-complicated-algo x)+(my-other-complicated-algo y)i (another- algo z)i) This is no issue at all without this notation: (complex-times [(my-complicated-algo x) (my-other-complicated-algo y)] [0 (another-algo z)]) Implementing this notation would obviously require a serious overhaul of clojure for a nice-to-have feature. -- You 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: SLIME REPL clojure completion
On Jun 8, 12:34 pm, Rick Moynihan rick.moyni...@gmail.com wrote: user java.lang.StrTAB No dynamic expansion for `user java.lang.Str' found. check your slime-complete-symbol-function. slime-complete-symbol* does not complete java classes, but slime- simple-complete does HTH, Joost. -- You 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: SLIME REPL clojure completion
Oops: check your slime-complete-symbol-function. slime-complete-symbol* does not complete java classes, but slime- simple-complete does that last one should be slime-simple-complete-symbol -- You 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: SLIME REPL clojure completion
Oh, and make SURE pressing TAB actually calls slime-complete-symbol and not some non-slime completion function. You can check by doing (in a clojure-mode buffer) C-h C-k TAB I believe the default binding is C-c TAB and M-TAB - not TAB. Joost. -- You 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: RFC: clj-ds Clojure data structure for Java (et al.)
On Jun 8, 3:11 pm, B Smith-Mannschott bsmith.o...@gmail.com wrote: Yes please! OK :) One nit: you probably didn't mean to check in your build products. The classes directory is full of *.class files. No, I didn't want the class files - I was a bit fast on the commit. I'll clean it up. /Karl -- You 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
Results from the State of Clojure, Summer 2010 Survey
Last week, many of you were kind enough to participate in a survey I linked to here and elsewhere, that I awkwardly titled The State of Clojure, Summer 2010. I've written up a summary of the results, and linked to the raw survey result data: http://bit.ly/dtdAwb There's a lot of interesting information there, a lot to be proud of, and a lot to think about. I want to thank everyone who participated in the survey, and urge everyone on this list to think about what you can do to contribute to the community so that results from the next State of Clojure survey will show the kind of growth and maturation that we all hope for. 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
Re: Complex type in clojure
On Tue, 8 Jun 2010 06:33:25 -0700 (PDT) Steven Devijver steven.devij...@gmail.com wrote: On 8 jun, 05:47, Daniel doubleagen...@gmail.com wrote: These notation arguments are compelling. I'm not convinced. The notation would only work for literals, and how often would one write literal complex numbers? For non-literals the notation would need to support this: (* (my-complicated-algo x)+(my-other-complicated-algo y)i (another- algo z)i) Why? It isn't supported for rationals or exponents. Or are you claiming that because we support 3/4 we should also support (* (my-complicated-algo val)/(my-other-complicated-algo exp) 1/(another-complicated-algo exp2)) with similar problems because we support 1e3? mike -- Mike Meyer m...@mired.org http://www.mired.org/consulting.html Independent Network/Unix/Perforce consultant, email for more information. O ascii ribbon campaign - stop html mail - www.asciiribbon.org -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com 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: SLIME REPL clojure completion
On 8 June 2010 14:42, Joost jo...@zeekat.nl wrote: Oh, and make SURE pressing TAB actually calls slime-complete-symbol and not some non-slime completion function. You can check by doing (in a clojure-mode buffer) C-h C-k TAB I believe the default binding is C-c TAB and M-TAB - not TAB. Thanks for the help. Your suggestions helped me diagnose and fix the problem. R. -- You 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: Complex type in clojure
On 8 jun, 16:38, Mike Meyer mwm-keyword-googlegroups. 620...@mired.org wrote: Why? It isn't supported for rationals or exponents. Or are you claiming that because we support 3/4 we should also support (* (my-complicated-algo val)/(my-other-complicated-algo exp) 1/(another-complicated-algo exp2)) with similar problems because we support 1e3? mike What would (Math/pow (Math/E (* 2/5 2 Math/PI i))) return? -- You 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: Complex type in clojure
On Jun 8, 6:33 am, Steven Devijver steven.devij...@gmail.com wrote: On 8 jun, 05:47, Daniel doubleagen...@gmail.com wrote: These notation arguments are compelling. I'm not convinced. The notation would only work for literals Correct. For non-literals the notation would need to support this: (* (my-complicated-algo x)+(my-other-complicated-algo y)i (another- algo z)i) You're conflating notation with operation. This is no issue at all without this notation: (complex-times [(my-complicated-algo x) (my-other-complicated-algo y)] [0 (another-algo z)]) The point here is not simply to add a literal notation, but to integrate complex type handling into the math functions. Bifurcating the math functions is a horrible idea. Implementing this notation would obviously require a serious overhaul of clojure for a nice-to-have feature. Augmenting the math functions to support complex numbers requires a serious overhaul. Augmenting the reader to handle the notation is trivial, so I'm not clear on why you're obsessing about 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
Re: Complex type in clojure
On 8 jun, 19:43, ataggart alex.tagg...@gmail.com wrote: On Jun 8, 6:33 am, Steven Devijver steven.devij...@gmail.com wrote: On 8 jun, 05:47, Daniel doubleagen...@gmail.com wrote: These notation arguments are compelling. I'm not convinced. The notation would only work for literals Correct. For non-literals the notation would need to support this: (* (my-complicated-algo x)+(my-other-complicated-algo y)i (another- algo z)i) You're conflating notation with operation. This is no issue at all without this notation: (complex-times [(my-complicated-algo x) (my-other-complicated-algo y)] [0 (another-algo z)]) The point here is not simply to add a literal notation, but to integrate complex type handling into the math functions. Bifurcating the math functions is a horrible idea. Implementing this notation would obviously require a serious overhaul of clojure for a nice-to-have feature. Augmenting the math functions to support complex numbers requires a serious overhaul. Augmenting the reader to handle the notation is trivial, so I'm not clear on why you're obsessing about it. It's a mischaracterization to say I'm obsessed about this. I think this whole idea is an waste of time and effort with no valuable outcome. Color me skeptical. -- You 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: Complex type in clojure
On Tue, 8 Jun 2010 10:27:28 -0700 (PDT) Steven Devijver steven.devij...@gmail.com wrote: On 8 jun, 16:38, Mike Meyer mwm-keyword-googlegroups. 620...@mired.org wrote: Why? It isn't supported for rationals or exponents. Or are you claiming that because we support 3/4 we should also support (* (my-complicated-algo val)/(my-other-complicated-algo exp) 1/(another-complicated-algo exp2)) with similar problems because we support 1e3? What would (Math/pow (Math/E (* 2/5 2 Math/PI i))) return? Why is this relevant to a discussion of whether or not support for complex literals is desirable? All but i is involved with the semantics of complex values, not the literal. mike -- Mike Meyer m...@mired.org http://www.mired.org/consulting.html Independent Network/Unix/Perforce consultant, email for more information. O ascii ribbon campaign - stop html mail - www.asciiribbon.org -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com 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 simple csv parsing library
I've added my work on the csv reader/writer library to github (http://github.com/jonase/cljcsv). Please let me know If anyone finds it useful. Thanks, Jonas On Wed, May 26, 2010 at 6:40 AM, Jonas Enlund jonas.enl...@gmail.com wrote: Hi there I built a simple csv parsing library[1] last weekend which I want to show you guys. It follows the RFC 4180[2] pretty closely but it allows for any character as separator and quote mark. It would be great if someone would take time and read the code. I would like to know: a) Can performance still be improved? b) Is it idiomatically written? c) What should an idiomatic csv parsing API look like in Clojure? Currently there is only one public function, 'parse' (like clojure.xml). The end of the file contains a few usage examples. happy hacking! /Jonas [1] http://gist.github.com/414023 [2] http://tools.ietf.org/html/rfc4180 -- You 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: Broken Link in Clojure Contrib Docs
Stu, I don't see a commit from you on this. Tom On Jun 8, 6:16 am, Stuart Halloway stuart.hallo...@gmail.com wrote: Fixed in the repos, thanks. Will show up in docs shortly. Stu Hello all, Not sure where to report this but I noticed a broken link when taking a look at the docs for sql in Clojure Contrib. http://richhickey.github.com/clojure-contrib/sql-api.html The link for Example code points here: http://code.google.com/p/clojure-contrib/source/browse/trunk/src/cloj... Which is no longer around. If I'm reporting this in the wrong place then please let me know and I'll move the post. Cheers, Daniel -- You 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: Broken Link in Clojure Contrib Docs
Sorry, should be there now. Stu, I don't see a commit from you on this. Tom On Jun 8, 6:16 am, Stuart Halloway stuart.hallo...@gmail.com wrote: Fixed in the repos, thanks. Will show up in docs shortly. Stu Hello all, Not sure where to report this but I noticed a broken link when taking a look at the docs for sql in Clojure Contrib. http://richhickey.github.com/clojure-contrib/sql-api.html The link for Example code points here: http://code.google.com/p/clojure-contrib/source/browse/trunk/src/cloj... Which is no longer around. If I'm reporting this in the wrong place then please let me know and I'll move the post. Cheers, Daniel -- You 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
Quick question
Does anybody know how I can produce a sorted-set from a list without overflowing the stack on a list of up to 20 items? -- You 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: Complex type in clojure
Why not just treat is as a vector, do vector math operations on it, and be done with it? 1+2j is equivalent to [1 2]. 1+2j represents a 2-D vector, does it not? Not only does this handle imaginaries, but higher forms, such as [1 2 3 4]. The beauty of Lisp is that once you accept the basic syntax (atoms and groupings), you don't have to worry about developing EBNF forms for every arbitrary human readable notation. Or I could be totally wrong. On Jun 8, 12:03 pm, Mike Meyer mwm-keyword-googlegroups. 620...@mired.org wrote: On Tue, 8 Jun 2010 10:27:28 -0700 (PDT) Steven Devijver steven.devij...@gmail.com wrote: On 8 jun, 16:38, Mike Meyer mwm-keyword-googlegroups. 620...@mired.org wrote: Why? It isn't supported for rationals or exponents. Or are you claiming that because we support 3/4 we should also support (* (my-complicated-algo val)/(my-other-complicated-algo exp) 1/(another-complicated-algo exp2)) with similar problems because we support 1e3? What would (Math/pow (Math/E (* 2/5 2 Math/PI i))) return? Why is this relevant to a discussion of whether or not support for complex literals is desirable? All but i is involved with the semantics of complex values, not the literal. mike -- Mike Meyer m...@mired.org http://www.mired.org/consulting.html Independent Network/Unix/Perforce consultant, email for more information. O ascii ribbon campaign - stop html mail -www.asciiribbon.org -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Quick question
Does anybody know how I can produce a sorted-set from a list without overflowing the stack on a list of up to 20 items? I'm thinking I must be misunderstanding the question, but (apply sorted-set lst)? -- / 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
Re: Complex type in clojure
Steven, I see your point, however, if we look (again) at Ratio for insight: user= (+ (+ 1 2)/(+ 3 4) 5) java.lang.ClassCastException: clojure.core$_SLASH_ cannot be cast to java.lang.Number (NO_SOURCE_FILE:0) The sort of notation for non-literals you suggest would be required would actually not be required nor, in my humble opinion, advisable. Or, at least it is not implemented for Ratio. Perhaps you're thinking of the '+' and '-' as infixed addition or subtraction, when they're not intended to be, no more than the '/' is infixed division in a Ratio. Instead, one could do: user= (+ 1 2i) 1+2i Lastly, I'll argue it's not so much literals that are the big need as are stored values. If you saved a Ratio in a String (say, in a Database), you can retrieve and read it in naturally with it's toString() format. I suppose java serialized storage does avoid this, but we still would need to handle the natural toString() format of the output of a complex number, just as Ratio does. On a side note, I really appreciate all these contrasting opinions. Ultimately, I'm going to have to convince Rich and the other core developers to make this change, and I think I'm going to have a much more well-reasoned and developed argument for the change when I do! :-) -Travis On Jun 8, 6:33 am, Steven Devijver steven.devij...@gmail.com wrote: On 8 jun, 05:47, Daniel doubleagen...@gmail.com wrote: These notation arguments are compelling. I'm not convinced. The notation would only work for literals, and how often would one write literal complex numbers? For non-literals the notation would need to support this: (* (my-complicated-algo x)+(my-other-complicated-algo y)i (another- algo z)i) This is no issue at all without this notation: (complex-times [(my-complicated-algo x) (my-other-complicated-algo y)] [0 (another-algo z)]) Implementing this notation would obviously require a serious overhaul of clojure for a nice-to-have feature. -- You 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: Complex type in clojure
Well, I don't find the question to be irrelevant. It makes me think about a couple issues: 1.) Should Complex and Imaginary extend java.lang.Number? 2.) What do we do with the standard Java math functions? 3.) Is 'i' by itself, valid input as a number? First, I do not propose that just i or j is enough to indicate the imaginary number, no more than just 'd' means the number 1.0d (the latter is correct way to write a double in Java and in clojure). That said, I would expect the same result that clojure gives now: user= (Math/pow (Math/E (* 2/5 2 Math/PI i))) java.lang.Exception: Unable to resolve symbol: i in this context (NO_SOURCE_FILE:4) If you use: 1.0i user= (Math/pow (Math/E (* 2/5 2 Math/PI 1.0i))) java.lang.IllegalArgumentException: No matching method: E (NO_SOURCE_FILE:1) Oops! You have an extra set of parenthesis! If you meant (Math/pow Math/E (* 2/5 2 Math/PI 1.0i)), then the answer depends on whether Imaginary extends Number. If it does logical (but perhaps confusing) answer is: user= (Math/pow (Math/E (* 2/5 2 Math/PI 1.0i)) 1.0 Why? Because you're forcing java.lang.Math.pow(double, double). Java will then force the cast of the Imaginary number to a double by calling doubleValue() on 2.51327412i which has no real component, thus, you're finding E^0.0 = 1.0. This is the exact same behavior you would have in Java if you were working with a custom Complex Java type which extends Number. If, however, we choose the route Commons Math chooses (to not extend Number), we should get something like we get now if we pass a non- Number type to Math/pow: user= (Math/pow Math/E cat) java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Number (NO_SOURCE_FILE:0) So, I would expect something like: user= (Math/pow Math/E 5i) java.lang.ClassCastException: clojure.lang.Imaginary cannot be cast to a java.lang.Number (NO_SOURCE_FILE:0) To get something useful, one would have to use a library (a standard clojure math library) which supports the complex type, just as it is in Java. This seems to be the preferable approach. Thanks for the skepticism and the question! -Travis On Jun 8, 11:03 am, Mike Meyer mwm-keyword-googlegroups. 620...@mired.org wrote: On Tue, 8 Jun 2010 10:27:28 -0700 (PDT) Steven Devijver steven.devij...@gmail.com wrote: On 8 jun, 16:38, Mike Meyer mwm-keyword-googlegroups. 620...@mired.org wrote: Why? It isn't supported for rationals or exponents. Or are you claiming that because we support 3/4 we should also support (* (my-complicated-algo val)/(my-other-complicated-algo exp) 1/(another-complicated-algo exp2)) with similar problems because we support 1e3? What would (Math/pow (Math/E (* 2/5 2 Math/PI i))) return? Why is this relevant to a discussion of whether or not support for complex literals is desirable? All but i is involved with the semantics of complex values, not the literal. mike -- Mike Meyer m...@mired.org http://www.mired.org/consulting.html Independent Network/Unix/Perforce consultant, email for more information. O ascii ribbon campaign - stop html mail -www.asciiribbon.org -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com 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: RFC: clj-ds Clojure data structure for Java (et al.)
I really like the idea of modularizing the language. Not just the Java parts, since Clojure compiles to class files as well. The clojure.jar / clojure-contrib.jar split is artificial, and the bigger these libraries get, the more obvious it will become that they need to be broken into multiple separate projects. On Jun 8, 8:08 am, Krukow karl.kru...@gmail.com wrote: On Jun 8, 3:11 pm, B Smith-Mannschott bsmith.o...@gmail.com wrote: Yes please! OK :) One nit: you probably didn't mean to check in your build products. The classes directory is full of *.class files. No, I didn't want the class files - I was a bit fast on the commit. I'll clean it up. /Karl -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Quick question
Yes, that answers my question. Cool :) Sorry still a newbie to clojure and lisps in general here. No problem. I didn't mean to imply there was anything wrong with the question as such. It's just that you mentioned specifically overflowing the stack so I thought I might be missing something about the intent. -- / 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
Re: Opposite to bean?
Michael, See http://groups.google.com/group/clojure/browse_thread/thread/8e8d3c5e85e4f82d/faf0669fe3e0dca0?q=#faf0669fe3e0dca0 for one idea. Bill Smith Austin, TX -- You 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: PDF generation with Clojure?
We use flying saucer/itext , an example of this from clojure can be seen on my blog at: http://www.talios.com/connecting_the_clouds__the_internet_in_new_zealand_in_pdf.htm This is some old clojure code and is quite nasty, but its only really the last 5 lines you need for the flying saucer stuff. This does XHTML+CSS-PDF. -- Pull me down under... On Tue, May 25, 2010 at 10:22 AM, Jim Tittsler j...@onjapan.net wrote: Is there a library for generating PDF pages/reports with Clojure? (Or a Java library that interoperates more naturally than others?) -- You 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 simple csv parsing library
I've added my work on the csv reader/writer library to github (http://github.com/jonase/cljcsv). Please let me know If anyone finds it useful. Thanks for the implementation, I'm very encouraged that you followed the RFC (I've seen lots of implementations that haven't). I took a quick look at both yours and clojure-csv [1]. I'm not using the 1.2 snapshots so I wasn't able to try out your implementation, but I did notice clojure-csv is lax about invalidly formatted files - if a quoted field ends the file but is not terminated before eof, it does not signal an error. I think I recognize the same behavior in cljcsv as well (though as I said I could not try it). It might be nice to at least have an option which allows an unterminated field to be recognized. Best Regards, Kyle [1] http://github.com/davidsantiago/clojure-csv On Wed, May 26, 2010 at 6:40 AM, Jonas Enlund jonas.enl...@gmail.com wrote: Hi there I built a simple csv parsing library[1] last weekend which I want to show you guys. It follows the RFC 4180[2] pretty closely but it allows for any character as separator and quote mark. It would be great if someone would take time and read the code. I would like to know: a) Can performance still be improved? b) Is it idiomatically written? c) What should an idiomatic csv parsing API look like in Clojure? Currently there is only one public function, 'parse' (like clojure.xml). The end of the file contains a few usage examples. happy hacking! /Jonas [1] http://gist.github.com/414023 [2] http://tools.ietf.org/html/rfc4180 -- You 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 -- -- kyle.bur...@gmail.comhttp://asymmetrical-view.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: Complex type in clojure
On Wed, Jun 9, 2010 at 2:43 AM, ataggart alex.tagg...@gmail.com wrote: For non-literals the notation would need to support this: (* (my-complicated-algo x)+(my-other-complicated-algo y)i (another- algo z)i) You're conflating notation with operation. I wouldn't even bother with reader notation. Both (complex -1 0) and (complex-polar 1 3.14) are readable an compact enough to me. We would still need some support for notation when printing the results, though (could even be that constructor notation), unless we are happy exposing implementation details. This may not be that difficult, AFAIK print is already using multimethod dispatch. The point here is not simply to add a literal notation, but to integrate complex type handling into the math functions. Bifurcating the math functions is a horrible idea. Exactly. Speaking for myself again, I use complex numbers (much) more often than ratios (in fact, so far I only played with ratios rather than used them) and such integration would be very useful for me. The question is, how far are we ready to go in that way? I imagine at least two more data types that could be plugged into numeric tower: - vectors/matrices - symbolic expressions Maybe instead of hardwiring all these types, we should provide a mechanism for overloading math operators? I guess multimethods would be too slow and I have no experience with defrecord/... to predict robustness of this solution. -Andrzej -- You 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: Complex type in clojure
On 09.06.2010, at 05:56, Andrzej wrote: The point here is not simply to add a literal notation, but to integrate complex type handling into the math functions. Bifurcating the math functions is a horrible idea. Exactly. Speaking for myself again, I use complex numbers (much) more often than ratios (in fact, so far I only played with ratios rather than used them) and such integration would be very useful for me. Same here. It's indeed not a trivial job, but a useful one. The question is, how far are we ready to go in that way? I imagine at least two more data types that could be plugged into numeric tower: - vectors/matrices - symbolic expressions Neither of those are numbers in the mathematical sense. And from an implementation point of view, both matrices and symbolic expressions already have so much overhead that they don't require the same kind of optimization that number implementations usually get. Maybe instead of hardwiring all these types, we should provide a mechanism for overloading math operators? I guess multimethods would be too slow and I have no experience with defrecord/... to predict robustness of this solution. That's the way I explored in clojure.contrib.generic, using multimethods. I don't think the new protocol mechanism is a good choice, because it is limited to single dispatch. As I said a few messages ago in this thread, I do think that generic maths operations are very useful to have, and I appreciate Clojure for making it possible to implement and use them in a very nice way, but I do not think they are the way to go for the basic number tower, because of the multimethod overhead. I'd like to see an efficient number tower in clojure.core, ideallly with complex numbers added in, and a library for generic operations available as an add-on. 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
