Re: Newbie suggestion for an implementation - rosettacode pythagorean means
here is the final version of the implementation. http://gist.github.com/313558 again, any thought would be great. Aviad. On 22 February 2010 22:11, Aviad Reich wrote: > I don't mean to signal the end of this thread, but I just wanted to thank > you all for you replies. > I will update the draft (and add Colin and Mikel's infinite seq code as > well) possible in a day or two (no at home till then), and post the new code > before posting to Rosetta. > > Cheers, > Aviad > > > > On 22 February 2010 14:47, Michael Kohl wrote: > >> On Mon, Feb 22, 2010 at 11:43 AM, Johnny Kwan >> wrote: >> > Whichever is faster depends on the size of the argument list >> >> I see, thanks for clarifying. I'd then change my version to this since >> I still like map with an anonymous function more than the >> for-comprehension in this case. >> >> defn h-mean [coll] >>(/ (count coll) (reduce + (map #(/ 1 %) coll >> >> Michael >> >> -- >> 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
order of function definition
I define a function foo in which it calls an auxiliary function bar, which is not yet defined, and a compiler exception is raised claiming unable to resolve symbol bar. Is there a way that I can define the functions in any order I want, without taking care of defining the auxiliary function first? Thanks. -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: order of function definition
not yet. But you can just declare the function, before implementing it: (declare bar) (defn foo [] (bar "hello")) (defn bar [man] (println "hello" man)) Be aware that if you need to typehint bar, you'll also need to type hint the bar declaration, so that the compilation of foo can use this information ; see: user=> (set! *warn-on-reflection* true) true user=> (declare bar) #'user/bar user=> (defn foo [] (.length (bar "laurent"))) Reflection warning, NO_SOURCE_PATH:5 - reference to field length can't be resolved. #'user/foo user=> (declare #^String bar) #'user/bar user=> (defn foo [] (.length (bar "laurent"))) #'user/foo user=> HTH, -- Laurent 2010/2/25 reynard : > I define a function foo in which it calls an auxiliary function bar, > which is not yet defined, and a compiler exception is raised claiming > unable to resolve symbol bar. > > Is there a way that I can define the functions in any order I want, > without taking care of defining the auxiliary function first? Thanks. > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to clojure@googlegroups.com > Note that posts from new members are moderated - please be patient with your > first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en -- 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: order of function definition
Hi, On Feb 25, 11:24 am, reynard wrote: > I define a function foo in which it calls an auxiliary function bar, > which is not yet defined, and a compiler exception is raised claiming > unable to resolve symbol bar. > > Is there a way that I can define the functions in any order I want, > without taking care of defining the auxiliary function first? Thanks. (declare bar) (defn foo ...) (defn bar ...) Sincerely Meikel -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: clojure-clr how to wire up a delegate
Parallel to proxy, clojure-clr adds a gen-delegate. Example code is in http://github.com/richhickey/clojure-clr/blob/master/Clojure/Clojure.Source/clojure/samples/celsius.clj Specifically, for adding an EventHandler: (.add_Click button (gen-delegate EventHandler [sender args] (let [c (Double/Parse (.Text tb)) ] (.set_Text f-label (str (+ 32 (* 1.8 c)) " Fahrenheit") -David On Feb 24, 1:43 am, adam11235 wrote: > Hi, > > I've made progress in creating a simple app to show a windows form, > however I am having trouble wiring up a delegate (to handle button > clicks). > > The Java version uses Proxy to implement ActionListener, instead I am > just trying to create an EventHandler passing as the 2nd constructor > argument the code I would like executed. (see the .add_Click line) > > The delegate code gets invoked immediately instead of when the button > click occurs, and then complains it expected a function pointer rather > than the DialogResult it received (due to execution of the code) > > I tried quoting that code but no success. > > How do you wire up delegates? > > (import '(System.Windows.Forms MessageBox Form Button)) > > (defn windowsPlay [] > (let > [ win (Form.) > temp-button (Button.) > ] > (.. win (get_Controls) (Add temp-button)) > (doto temp-button > (.set_Top 50) > (.set_Text "Clicky") > (.add_Click (EventHandler. temp-button (MessageBox/Show "I got > clicked" > (doto win > (.set_Text "hello") > (.ShowDialog > > (windowsPlay) > > Thanks, Adam. -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
clojure.zip - throws exception
I am getting the following exception while trying to use clojure.zip user=> (use '[clojure.zip :as zip]) java.lang.IllegalStateException: next already refers to: #'clojure.core/next in namespace: user (NO_SOURCE_FILE:0) What I am I missing? -- 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
possible errors in ns documentation
Hi all, I'm not sure if this is the right place to raise this. I am new to clojure and was going through the docs for namespaces here: http://richhickey.github.com/clojure/clojure.core-api.html#clojure.core/ns In the example there it implies that the way to import functions into your namespace is as follows: (ns foo (:use some.lib)) In actuality you (at least I did) need to this to get this to load: (ns foo (:use [some.lib])) Is this correct? Could that possibly be clarified in the docs if so? If I am wrong could someone point me in the right direction for the correct usage. Thanks -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
prn to a file with large data structures?
I'm trying to prn a large data structure to a file so I can later read it back in, like so - (defn write-nick-sets [file-name obj] (binding [*out* (java.io.FileWriter. file-name)] (prn obj))) obj here is a map with a string as its key and another map as its value. The nested map has a list as its key and a set as its value. When I prn the structure to a file as above, it doesn't print out all my data, only 40 key-value pairs for each nested map are printed, and an ellipsis is inserted after them (I guess to represent the remainder). Anyone know what I'm doing wrong here? How can I print the whole data structure to a file, in a way that the reader can understand? -- 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: order of function definition
(declare bar) -- Freedom's just another word for nothing left to lose -- 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: Newbie suggestion for an implementation - rosettacode pythagorean means
Hi, I have a small improvement. The function / called with only argument returns the inverse, so you can define g-mean and h-mean more shortly: (defn g-mean [coll] (expt (reduce * coll) (/ (count coll (defn h-mean [coll] ;; Michael Kohl's function (/ (count coll) (reduce + (map / coll On Feb 25, 9:07 am, Aviad Reich wrote: > here is the final version of the implementation.http://gist.github.com/313558 > > again, any thought would be great. > Aviad. > > On 22 February 2010 22:11, Aviad Reich wrote: > > > > > I don't mean to signal the end of this thread, but I just wanted to thank > > you all for you replies. > > I will update the draft (and add Colin and Mikel's infinite seq code as > > well) possible in a day or two (no at home till then), and post the new code > > before posting to Rosetta. > > > Cheers, > > Aviad > > > On 22 February 2010 14:47, Michael Kohl wrote: > > >> On Mon, Feb 22, 2010 at 11:43 AM, Johnny Kwan > >> wrote: > >> > Whichever is faster depends on the size of the argument list > > >> I see, thanks for clarifying. I'd then change my version to this since > >> I still like map with an anonymous function more than the > >> for-comprehension in this case. > > >> defn h-mean [coll] > >> (/ (count coll) (reduce + (map #(/ 1 %) coll > > >> Michael > > >> -- > >> You received this message because you are subscribed to the Google > >> Groups "Clojure" group. > >> To post to this group, send email to clojure@googlegroups.com > >> Note that posts from new members are moderated - please be patient with > >> your first post. > >> To unsubscribe from this group, send email to > >> clojure+unsubscr...@googlegroups.com >> > > >> For more options, visit this group at > >>http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: clojure.zip - throws exception
Hmm... what versions of Clojure (and other libs) are you using? Sean On Feb 24, 2:59 pm, Amitava Shee wrote: > I am getting the following exception while trying to use clojure.zip > > user=> (use '[clojure.zip :as zip]) > java.lang.IllegalStateException: next already refers to: > #'clojure.core/next in namespace: user (NO_SOURCE_FILE:0) > > What I am I missing? -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: possible errors in ns documentation
Hi, On Feb 24, 10:17 pm, j1n3l0 wrote: > (ns foo > (:use some.lib)) This works find for me. Sincerely Meikel -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: prn to a file with large data structures?
Hi, On Feb 25, 4:17 am, NovusTiro wrote: > I'm trying to prn a large data structure to a file so I can later read > it back in, like so - > > (defn write-nick-sets [file-name obj] > (binding [*out* (java.io.FileWriter. file-name)] > (prn obj))) > > obj here is a map with a string as its key and another map as its > value. The nested map has a list as its key and a set as its value. > When I prn the structure to a file as above, it doesn't print out all > my data, only 40 key-value pairs for each nested map are printed, and > an ellipsis is inserted after them (I guess to represent the > remainder). > > Anyone know what I'm doing wrong here? How can I print the whole data > structure to a file, in a way that the reader can understand? Checkout *print-length* and *print-level*. I guess you are caught be *print-length*. Although the default is to print everything. So maybe it is bound to something else somewhere in your call chain. Sincerely Meikel -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: possible errors in ns documentation
What Clojure version are you using? On Feb 24, 4:17 pm, j1n3l0 wrote: > Hi all, > > I'm not sure if this is the right place to raise this. I am new to > clojure and was going through the docs for namespaces here: > > http://richhickey.github.com/clojure/clojure.core-api.html#clojure.co... > > In the example there it implies that the way to import functions into > your namespace is as follows: > > (ns foo > (:use some.lib)) > > In actuality you (at least I did) need to this to get this to load: > > (ns foo > (:use [some.lib])) > > Is this correct? Could that possibly be clarified in the docs if so? > If I am wrong could someone point me in the right direction for the > correct usage. > > Thanks -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: clojure.zip - throws exception
Hi, On Feb 24, 8:59 pm, Amitava Shee wrote: > I am getting the following exception while trying to use clojure.zip > > user=> (use '[clojure.zip :as zip]) > java.lang.IllegalStateException: next already refers to: > #'clojure.core/next in namespace: user (NO_SOURCE_FILE:0) > > What I am I missing? 1. (ns foo.bar (:require [clojure.zip :as zip])) => you have to prefix elements from c.z with zip (eg. zip/down), etc. 2. (ns foo.bar (:use [clojure.zip :as zip :exclude (next)])) => you can use all functions from c.z directly (eg. down), only next has to be called as zip/next. 3. (ns foo.bar (:refer-clojure :exclude (next)) (:use clojure.zip)) => you can call all function from c.z directly including next, but you have to qualify calls to the next from core: clojure.core/next. Hope that helps. The first alternative is probably what you wanted to do in the first 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
Re: prn to a file with large data structures?
Try including [*print-dup* true] in the binding; (defn write-nick-sets [file-name obj]] (with-open [w (FileWriter. (File. file-name))] (binding [*out* w *print-dup* true] (prn obj You can read it back with; (defn rec-load "Load a clojure form from file" [#^File file] (with-open [r (PushbackReader. (FileReader. file))] (let [rec (read r)] rec))) See clojure.core_print.clj in the clojure source for details. -Regards, Adrian. On Thu, Feb 25, 2010 at 5:17 AM, NovusTiro wrote: > I'm trying to prn a large data structure to a file so I can later read > it back in, like so - > > (defn write-nick-sets [file-name obj] > (binding [*out* (java.io.FileWriter. file-name)] > (prn obj))) > > obj here is a map with a string as its key and another map as its > value. The nested map has a list as its key and a set as its value. > When I prn the structure to a file as above, it doesn't print out all > my data, only 40 key-value pairs for each nested map are printed, and > an ellipsis is inserted after them (I guess to represent the > remainder). > > Anyone know what I'm doing wrong here? How can I print the whole data > structure to a file, in a way that the reader can understand? > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to clojure@googlegroups.com > Note that posts from new members are moderated - please be patient with your > first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: clojure.zip - throws exception
Use require instead of use: (require '[clojure.zip :as zip]) Tobias On Wed, Feb 24, 2010 at 8:59 PM, Amitava Shee wrote: > I am getting the following exception while trying to use clojure.zip > > user=> (use '[clojure.zip :as zip]) > java.lang.IllegalStateException: next already refers to: > #'clojure.core/next in namespace: user (NO_SOURCE_FILE:0) > > What I am I missing? > > -- > 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: Newbie suggestion for an implementation - rosettacode pythagorean means
thanks! On 25 February 2010 15:28, fra wrote: > Hi, > > I have a small improvement. > The function / called with only argument returns the inverse, so you > can define g-mean and h-mean more shortly: > > (defn g-mean [coll] > (expt (reduce * coll) (/ (count coll > > (defn h-mean [coll] ;; Michael Kohl's function > (/ (count coll) (reduce + (map / coll > > > > > On Feb 25, 9:07 am, Aviad Reich wrote: > > here is the final version of the implementation. > http://gist.github.com/313558 > > > > again, any thought would be great. > > Aviad. > > > > On 22 February 2010 22:11, Aviad Reich wrote: > > > > > > > > > I don't mean to signal the end of this thread, but I just wanted to > thank > > > you all for you replies. > > > I will update the draft (and add Colin and Mikel's infinite seq code as > > > well) possible in a day or two (no at home till then), and post the new > code > > > before posting to Rosetta. > > > > > Cheers, > > > Aviad > > > > > On 22 February 2010 14:47, Michael Kohl wrote: > > > > >> On Mon, Feb 22, 2010 at 11:43 AM, Johnny Kwan < > johnny.c.k...@gmail.com> > > >> wrote: > > >> > Whichever is faster depends on the size of the argument list > > > > >> I see, thanks for clarifying. I'd then change my version to this since > > >> I still like map with an anonymous function more than the > > >> for-comprehension in this case. > > > > >> defn h-mean [coll] > > >>(/ (count coll) (reduce + (map #(/ 1 %) coll > > > > >> Michael > > > > >> -- > > >> 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
ANN: midi-clj and osc-clj
Just a quick announcement for any musical Clojurians out there. I've pushed midi-clj for simple MIDI communication, and osc-clj for communicating with new school instruments via Open Sound Control. Both were developed for project Overtone, but they might be useful for other projects. Get them with leiningen by adding them to your project.clj: [midi-clj "0.1"] [osc-clj "0.1"] or from github: http://github.com/rosejn/midi-clj http://github.com/rosejn/osc-clj Cheers, Jeff -- 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: Got a Clojure library?
> The name of your library clodiuno > Library home page URL http://nakkaya.com/clodiuno.markdown > Your name Nurullah Akkaya > Category (db, web, UI, parsing etc) Physical Computing > License Beerware Revision 42 > A one-paragraph description. Include 3rd party dependencies if any. Clodiuno is a library that allows you to control Arduino via Firmata protocol. The purpose of this library is to allow Clojure developers to interface with real world using Arduino hardware. Dependencies: RXTX -- Nurullah Akkaya http://nakkaya.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
Announce: Introductory article about Clojure in Russian
Hi all In new issue of Russian FP journal (http://fprog.ru/) was published an article about Clojure (http://fprog.ru/2010/issue4/alex-ott-clojure/ - HTML, and http://fprog.ru/2010/issue4/ - different PDF sizes). This is introduction-level article, that could be used as basis for studying Clojure. Discussion of article is Livejournal community - http://community.livejournal.com/fprog/7703.html P.S. There is one bug in HTML version - there is no indentation in examples - we're working on fixing this issue -- With best wishes, Alex Ott, MBA http://alexott.blogspot.com/http://alexott.net/ http://alexott-ru.blogspot.com/ -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: ANN: midi-clj and osc-clj
On Thu, Feb 25, 2010 at 4:41 PM, Jeff Rose wrote: > Just a quick announcement for any musical Clojurians out there. I've > pushed midi-clj for simple MIDI communication, and osc-clj for > communicating with new school instruments via Open Sound Control. > Both were developed for project Overtone, but they might be useful for > other projects. Interesting. The JVM could use a good sound library. Any chance of writing a mp3, ogg + flac decoder in clojure? :-) > Get them with leiningen by adding them to your project.clj: > > [midi-clj "0.1"] > [osc-clj "0.1"] > > or from github: > > http://github.com/rosejn/midi-clj > http://github.com/rosejn/osc-clj > > Cheers, > Jeff -- Anders Rune Jensen http://www.iola.dk -- 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: Prefixed or suffixed symbols?
On Feb 25, 12:17 am, joshua-choi wrote: > When it comes to distinguishing certain types of symbols from other > things, should one use prefixes or suffixes? Whichever makes more sense, of course. :) > > Example: naming tests with clojure.test/deftest. If you distinguish > your tests’ symbols at all, do you do “t-addition” or “addition-t”? > Name tests descriptively. Putting them in their own namespace helps too. If there's absolutely a need to distinguish them from non-tests, I would prefer '-test'. Abbreviating it just makes it noisy. > (I need to know what the standard is, if there is any, because I need > a way to distinguish a certain type of symbol—those that represent > “rules”— in my libraries. I’m using an underscore suffix right now, > like “vector_”, which means “vector-rule” But “_rule” might be better, > or even “_rule_”, though the last one might be overkill. In the past, > I’ve used “vector-r", but I don’t like that now.) I personally find underscores offensive, but... Some logic DSLs use ? foo for variables, maybe you could have something similar for you rules. Or you could name them using angled brackets (eg. ). When it comes to naming, you just need to be consistent. And avoid underscores, please :P -- 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: Prefixed or suffixed symbols?
Hello Joshua, I don't think there is an official standard in Clojure, at least not yet. For a source of inspiration, you may be interested in this thread, in case you haven't found it yourself yet: http://groups.google.com/group/clojure-dev/browse_thread/thread/d090b5599909497c Personally, I prefer to annotate functions that have specific meaning (like being a filter function used in templates, or a widget that spits out HTML) with a tag that explicitely states what they are (be it metadata in Clojure, or a decorator in Python which sets a specific instance variable on the function object) so functions of a kind can be programmatically queried at runtime (e.g., "give me all widgets in this namespace"). Regarding tests, in the Clojure code I've seen so far, people haven't used any specific notation, probably since tests are usually split off from the rest of the source anyway. Actually I had to smirk while reading your post, because only a few weeks ago I browsed your fnparse project's git repository out of interest. Looking at your "renaming" branch where you started adding underscores to the most important rule building functions, I just thought "what the heck is he doing here, and why?". So, generally I find _underscore_ naming to be less readable, especially when these names are being used regularly throughout the code, and avoid it myself. (Unless it is forced by language conventions, like __init__ and __repr__ etc. in Python.) -- 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: ANN: midi-clj and osc-clj
Luckily there are already good Java libraries for doing all three of these: jlayer, jorvis and jflac. We will probably integrate these in with Overtone eventually, but for now we just use wav files for samples. -Jeff On Feb 25, 8:53 pm, Anders Rune Jensen wrote: > On Thu, Feb 25, 2010 at 4:41 PM, Jeff Rose wrote: > > Just a quick announcement for any musical Clojurians out there. I've > > pushed midi-clj for simple MIDI communication, and osc-clj for > > communicating with new school instruments via Open Sound Control. > > Both were developed for project Overtone, but they might be useful for > > other projects. > > Interesting. The JVM could use a good sound library. Any chance of > writing a mp3, ogg + flac decoder in clojure? :-) > > > Get them with leiningen by adding them to your project.clj: > > > [midi-clj "0.1"] > > [osc-clj "0.1"] > > > or from github: > > >http://github.com/rosejn/midi-clj > >http://github.com/rosejn/osc-clj > > > Cheers, > > Jeff > > -- > Anders Rune Jensen > > http://www.iola.dk -- 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
no source file
Hi, I wrote some code, put it in a file, and now want to load that file. Here is the code I wrote, sqrs.clj: (use '[clojure.contrib.generic.math-functions :only (sqr)]) (defn square-of-sum [coll] "adds up collection of numbers and then squares it" (sqr (reduce + coll))) whenever I try (load-file sqrs.clj) i get a no source file exception. I have tried placing this file on my desktop, c:\, and clojure directory, but always get a no source file exception. Where should I put it? thx! -- 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: no source file
On Feb 25, 2010, at 8:21 PM, Glen Rubin wrote: > whenever I try (load-file sqrs.clj) i get a no source file exception. Does (load-file "sqrs.clj") work? --Steve -- 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
Vimclojure Performance on Windows
Installed vimclojure-2.1.2 on Windows XP SP3. Have dual-core machine and 4GB of RAM. In VimRepl (println "Hello World") takes about 10 seconds. Is this expected? Any suggestions how to speed this up? -- 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
let and nesting
One of my least favorite things about common lisp was the degree of nesting it required for sequential variable definitions. For common code like this: (let (a vala) (b valb) ... do something with a & b... (let (c (fn a b)) (d (fn a b)) ... do something with a, b, c, d... (let (e (fn ...)) (f (fn )) etc. You eventually get a very deeply nested function simply because the values of variables assigned later in the code depend on values determined earlier in the code. From what I can this is also the case in clojure, correct? In contrast, the python/ruby/java approach (which I realize has its own warts). a = 1 b = 2 c = a * b d = a + c e = func(d) in which new bindings are automatically created in the current scope, tends to be more readable in many cases. I'm new to clojure so I'm wondering - are there idiomatic ways of reducing the degree of scope-nesting let incurs or do people just tend to try to avoid that kind of code with smaller sub functions etc? -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: clojure.zip - throws exception
Thank you - this really helped. To Sean's question - I am using 1.1.0 Just to solidify my understanding, can this be done in the default namespace (of "user")? -Amitava On Feb 25, 9:50 am, Meikel Brandmeyer wrote: > Hi, > > On Feb 24, 8:59 pm, Amitava Shee wrote: > > > I am getting the following exception while trying to use clojure.zip > > > user=> (use '[clojure.zip :as zip]) > > java.lang.IllegalStateException: next already refers to: > > #'clojure.core/next in namespace: user (NO_SOURCE_FILE:0) > > > What I am I missing? > > 1. (ns foo.bar (:require [clojure.zip :as zip])) => you have to prefix > elements from c.z with zip (eg. zip/down), etc. > 2. (ns foo.bar (:use [clojure.zip :as zip :exclude (next)])) => you > can use all functions from c.z directly (eg. down), only next has to > be called as zip/next. > 3. (ns foo.bar (:refer-clojure :exclude (next)) (:use clojure.zip)) => > you can call all function from c.z directly including next, but you > have to qualify calls to the next from core: clojure.core/next. > > Hope that helps. The first alternative is probably what you wanted to > do in the first 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
Re: possible errors in ns documentation
Please forgive my mistake. I missed out a set of parentheses in there. It should be something like this: (ns foo (:use (some.lib))) There are othe scenarios of different use cases: ;; see link for example http://github.com/technomancy/leiningen/blob/master/src/lancet.clj (ns foo (:use [some.lib :only (some-function)])) I guess I need to read a few more tutorials before I start trying things like that. On that note, are there any good tutorials for non-java/lisp and/or beginner programmers out there? Thanks. Ps: I am using clojure version 1.1.0. On Feb 25, 2:48 pm, Sean Devlin wrote: > What Clojure version are you using? > > On Feb 24, 4:17 pm, j1n3l0 wrote: > > > Hi all, > > > I'm not sure if this is the right place to raise this. I am new to > > clojure and was going through the docs for namespaces here: > > >http://richhickey.github.com/clojure/clojure.core-api.html#clojure.co... > > > In the example there it implies that the way to import functions into > > your namespace is as follows: > > > (ns foo > > (:use some.lib)) > > > In actuality you (at least I did) need to this to get this to load: > > > (ns foo > > (:use [some.lib])) > > > Is this correct? Could that possibly be clarified in the docs if so? > > If I am wrong could someone point me in the right direction for the > > correct usage. > > > Thanks -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: let and nesting
On Thu, 25 Feb 2010 16:28:05 -0800 (PST) kuniklo wrote: > One of my least favorite things about common lisp was the degree of > nesting it required for sequential variable definitions. For common > code like this: > > (let (a vala) > (b valb) > ... do something with a & b... > (let (c (fn a b)) >(d (fn a b)) > ... do something with a, b, c, d... >(let (e (fn ...)) > (f (fn )) You might want to check out let*. > etc. You eventually get a very deeply nested function simply because > the values of variables assigned later in the code depend on values > determined earlier in the code. From what I can this is also the case > in clojure, correct? Nope. Clojure's let is like CL's let* > In contrast, the python/ruby/java approach (which I realize has its > own warts). > a = 1 > b = 2 > c = a * b > d = a + c > e = func(d) In clojure, you'd do: (let [a 1 b 2 c (* a b) d (+ a c) e (func d)] (calculation using a, b, c, d and e)) > I'm new to clojure so I'm wondering - are there idiomatic ways of > reducing the degree of scope-nesting let incurs or do people just tend > to try to avoid that kind of code with smaller sub functions etc? Anything particularly wrong with the example I gave you? 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: Prefixed or suffixed symbols?
Yeah, I don’t really like the underscores either. But I have to work
with the set of currently allowed non-alphanumeric symbol characters
(*, +, !, -, _, and ?, according to clojure.org/reader).
There’s actually two different questions here—I’d love for other
people to bring in their input.
I need to set apart “rules”, a certain type of object, from other
kinds of Clojure objects. ("Why do you even need to do this?" people
ask. Because I really want to graphically set them apart in the
programmers mind. And also, rules often shared names with objects that
they were representing: it was difficult to remember string-char-r vs.
string-char in functions, for instance. It was always a big pain. I
think it will be worth it.)
Question 1: Of the allowed characters, which would be best to
distinguish rule symbols from other symbols?
* can be confused with the REPL vars (*1, *e, etc.) and re-bindable
vars.
+ may be a better choice, though in the other Lisps it already
indicates constants.
I don’t think ! and ? are good at all, because they really stand out
to me to mean destruction and querying respectively.
- is apparently used only once in the standard libraries: in defn-.
Maybe it would be a good choice.
_ is ugly, but it’s not used at all, so that’s good. Well, except when
used on its own: “_”, for useless bindings.
I’m leaning toward +, -, or _.
Question 2: Prefix, suffix, or circumfix?
+vector, vector+, or +vector+? -vector, vector-, -vector-? Or
whatever. Don’t forget, I’m deciding this for my parser rules library.
“vector” means a rule that can parse strings representing vectors.
Could everyone give me their opinion? Which annoys your taste the
least? I still have time to change the style in my library, and I’d
like to hear from as many people as possible.
On Feb 25, 3:16 pm, Jarkko Oranen wrote:
> On Feb 25, 12:17 am, joshua-choi wrote:
>
> > When it comes to distinguishing certain types of symbols from other
> > things, should one use prefixes or suffixes?
>
> Whichever makes more sense, of course. :)
>
>
>
> > Example: naming tests with clojure.test/deftest. If you distinguish
> > your tests’ symbols at all, do you do “t-addition” or “addition-t”?
>
> Name tests descriptively. Putting them in their own namespace helps
> too. If there's absolutely a need to distinguish them from non-tests,
> I would prefer '-test'. Abbreviating it just makes it noisy.
>
> > (I need to know what the standard is, if there is any, because I need
> > a way to distinguish a certain type of symbol—those that represent
> > “rules”— in my libraries. I’m using an underscore suffix right now,
> > like “vector_”, which means “vector-rule” But “_rule” might be better,
> > or even “_rule_”, though the last one might be overkill. In the past,
> > I’ve used “vector-r", but I don’t like that now.)
>
> I personally find underscores offensive, but... Some logic DSLs use ?
> foo for variables, maybe you could have something similar for you
> rules. Or you could name them using angled brackets (eg. ).
> When it comes to naming, you just need to be consistent. And avoid
> underscores, please :P
--
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Re: Prefixed or suffixed symbols?
I think using a naming convention isn't a good idea, especially when
you have a rich macro system like Clojure. I'm actually going to be
talking about using a reference to handle things like this in my next
episode. For now, you can take a look at my definference macro here:
http://github.com/francoisdevlin/devlinsf-clojure-utils/blob/master/src/lib/sfd/equations.clj
Hope this helps,
Sean
On Feb 25, 8:59 pm, joshua-choi wrote:
> Yeah, I don’t really like the underscores either. But I have to work
> with the set of currently allowed non-alphanumeric symbol characters
> (*, +, !, -, _, and ?, according to clojure.org/reader).
>
> There’s actually two different questions here—I’d love for other
> people to bring in their input.
>
> I need to set apart “rules”, a certain type of object, from other
> kinds of Clojure objects. ("Why do you even need to do this?" people
> ask. Because I really want to graphically set them apart in the
> programmers mind. And also, rules often shared names with objects that
> they were representing: it was difficult to remember string-char-r vs.
> string-char in functions, for instance. It was always a big pain. I
> think it will be worth it.)
>
> Question 1: Of the allowed characters, which would be best to
> distinguish rule symbols from other symbols?
>
> * can be confused with the REPL vars (*1, *e, etc.) and re-bindable
> vars.
> + may be a better choice, though in the other Lisps it already
> indicates constants.
> I don’t think ! and ? are good at all, because they really stand out
> to me to mean destruction and querying respectively.
> - is apparently used only once in the standard libraries: in defn-.
> Maybe it would be a good choice.
> _ is ugly, but it’s not used at all, so that’s good. Well, except when
> used on its own: “_”, for useless bindings.
>
> I’m leaning toward +, -, or _.
>
> Question 2: Prefix, suffix, or circumfix?
>
> +vector, vector+, or +vector+? -vector, vector-, -vector-? Or
> whatever. Don’t forget, I’m deciding this for my parser rules library.
> “vector” means a rule that can parse strings representing vectors.
>
> Could everyone give me their opinion? Which annoys your taste the
> least? I still have time to change the style in my library, and I’d
> like to hear from as many people as possible.
>
> On Feb 25, 3:16 pm, Jarkko Oranen wrote:
>
>
>
> > On Feb 25, 12:17 am, joshua-choi wrote:
>
> > > When it comes to distinguishing certain types of symbols from other
> > > things, should one use prefixes or suffixes?
>
> > Whichever makes more sense, of course. :)
>
> > > Example: naming tests with clojure.test/deftest. If you distinguish
> > > your tests’ symbols at all, do you do “t-addition” or “addition-t”?
>
> > Name tests descriptively. Putting them in their own namespace helps
> > too. If there's absolutely a need to distinguish them from non-tests,
> > I would prefer '-test'. Abbreviating it just makes it noisy.
>
> > > (I need to know what the standard is, if there is any, because I need
> > > a way to distinguish a certain type of symbol—those that represent
> > > “rules”— in my libraries. I’m using an underscore suffix right now,
> > > like “vector_”, which means “vector-rule” But “_rule” might be better,
> > > or even “_rule_”, though the last one might be overkill. In the past,
> > > I’ve used “vector-r", but I don’t like that now.)
>
> > I personally find underscores offensive, but... Some logic DSLs use ?
> > foo for variables, maybe you could have something similar for you
> > rules. Or you could name them using angled brackets (eg. ).
> > When it comes to naming, you just need to be consistent. And avoid
> > underscores, please :P
--
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Re: Prefixed or suffixed symbols?
Could you explain more what you mean? For instance, how are macros
related to these questions? This just has to do with informal naming
conventions, in the same matter as *e or *print-dup*. Are you talking
about that it’s possible for naming conventions to interfere with
macros that interpret symbols abnormally if they’re named a certain
way?
Now, I’ve considered just not using any characters to set apart rules
completely, but that’ll bring me back to my original problems. The
only disadvantage I can think of to using a convention is that it
might make code that use rules more noisy...but I think that’s
preferable to having to recall what a rule is called if it conflicts
with another symbol—which is really common with my rules. What
notation do you all think is the least ugly?
On Feb 25, 7:32 pm, Sean Devlin wrote:
> I think using a naming convention isn't a good idea, especially when
> you have a rich macro system like Clojure. I'm actually going to be
> talking about using a reference to handle things like this in my next
> episode. For now, you can take a look at my definference macro here:
>
> http://github.com/francoisdevlin/devlinsf-clojure-utils/blob/master/s...
>
> Hope this helps,
> Sean
>
> On Feb 25, 8:59 pm, joshua-choi wrote:
>
>
>
> > Yeah, I don’t really like the underscores either. But I have to work
> > with the set of currently allowed non-alphanumeric symbol characters
> > (*, +, !, -, _, and ?, according to clojure.org/reader).
>
> > There’s actually two different questions here—I’d love for other
> > people to bring in their input.
>
> > I need to set apart “rules”, a certain type of object, from other
> > kinds of Clojure objects. ("Why do you even need to do this?" people
> > ask. Because I really want to graphically set them apart in the
> > programmers mind. And also, rules often shared names with objects that
> > they were representing: it was difficult to remember string-char-r vs.
> > string-char in functions, for instance. It was always a big pain. I
> > think it will be worth it.)
>
> > Question 1: Of the allowed characters, which would be best to
> > distinguish rule symbols from other symbols?
>
> > * can be confused with the REPL vars (*1, *e, etc.) and re-bindable
> > vars.
> > + may be a better choice, though in the other Lisps it already
> > indicates constants.
> > I don’t think ! and ? are good at all, because they really stand out
> > to me to mean destruction and querying respectively.
> > - is apparently used only once in the standard libraries: in defn-.
> > Maybe it would be a good choice.
> > _ is ugly, but it’s not used at all, so that’s good. Well, except when
> > used on its own: “_”, for useless bindings.
>
> > I’m leaning toward +, -, or _.
>
> > Question 2: Prefix, suffix, or circumfix?
>
> > +vector, vector+, or +vector+? -vector, vector-, -vector-? Or
> > whatever. Don’t forget, I’m deciding this for my parser rules library.
> > “vector” means a rule that can parse strings representing vectors.
>
> > Could everyone give me their opinion? Which annoys your taste the
> > least? I still have time to change the style in my library, and I’d
> > like to hear from as many people as possible.
>
> > On Feb 25, 3:16 pm, Jarkko Oranen wrote:
>
> > > On Feb 25, 12:17 am, joshua-choi wrote:
>
> > > > When it comes to distinguishing certain types of symbols from other
> > > > things, should one use prefixes or suffixes?
>
> > > Whichever makes more sense, of course. :)
>
> > > > Example: naming tests with clojure.test/deftest. If you distinguish
> > > > your tests’ symbols at all, do you do “t-addition” or “addition-t”?
>
> > > Name tests descriptively. Putting them in their own namespace helps
> > > too. If there's absolutely a need to distinguish them from non-tests,
> > > I would prefer '-test'. Abbreviating it just makes it noisy.
>
> > > > (I need to know what the standard is, if there is any, because I need
> > > > a way to distinguish a certain type of symbol—those that represent
> > > > “rules”— in my libraries. I’m using an underscore suffix right now,
> > > > like “vector_”, which means “vector-rule” But “_rule” might be better,
> > > > or even “_rule_”, though the last one might be overkill. In the past,
> > > > I’ve used “vector-r", but I don’t like that now.)
>
> > > I personally find underscores offensive, but... Some logic DSLs use ?
> > > foo for variables, maybe you could have something similar for you
> > > rules. Or you could name them using angled brackets (eg. ).
> > > When it comes to naming, you just need to be consistent. And avoid
> > > underscores, please :P
--
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Re: Prefixed or suffixed symbols?
Hmmm... maybe I misunderstood your point. Is the intent of your
naming conventions:
a. Something that is human readable but does not affect the execution
of code? Examples include placing I in front of interface names, and
A in front of abstract class names.
b. Something that other code will use to infer behavior? Examples of
this include JUnit 3.8 & the get/set Java Bean convention.
If it's a, I made a mistake & my comments don't apply (as a matter of
taste I like suffixes). If it's the behavior version, I think that a
special macro is in order (e.g. deftest)
Sean
On Feb 25, 10:22 pm, joshua-choi wrote:
> Could you explain more what you mean? For instance, how are macros
> related to these questions? This just has to do with informal naming
> conventions, in the same matter as *e or *print-dup*. Are you talking
> about that it’s possible for naming conventions to interfere with
> macros that interpret symbols abnormally if they’re named a certain
> way?
>
> Now, I’ve considered just not using any characters to set apart rules
> completely, but that’ll bring me back to my original problems. The
> only disadvantage I can think of to using a convention is that it
> might make code that use rules more noisy...but I think that’s
> preferable to having to recall what a rule is called if it conflicts
> with another symbol—which is really common with my rules. What
> notation do you all think is the least ugly?
>
> On Feb 25, 7:32 pm, Sean Devlin wrote:
>
>
>
> > I think using a naming convention isn't a good idea, especially when
> > you have a rich macro system like Clojure. I'm actually going to be
> > talking about using a reference to handle things like this in my next
> > episode. For now, you can take a look at my definference macro here:
>
> >http://github.com/francoisdevlin/devlinsf-clojure-utils/blob/master/s...
>
> > Hope this helps,
> > Sean
>
> > On Feb 25, 8:59 pm, joshua-choi wrote:
>
> > > Yeah, I don’t really like the underscores either. But I have to work
> > > with the set of currently allowed non-alphanumeric symbol characters
> > > (*, +, !, -, _, and ?, according to clojure.org/reader).
>
> > > There’s actually two different questions here—I’d love for other
> > > people to bring in their input.
>
> > > I need to set apart “rules”, a certain type of object, from other
> > > kinds of Clojure objects. ("Why do you even need to do this?" people
> > > ask. Because I really want to graphically set them apart in the
> > > programmers mind. And also, rules often shared names with objects that
> > > they were representing: it was difficult to remember string-char-r vs.
> > > string-char in functions, for instance. It was always a big pain. I
> > > think it will be worth it.)
>
> > > Question 1: Of the allowed characters, which would be best to
> > > distinguish rule symbols from other symbols?
>
> > > * can be confused with the REPL vars (*1, *e, etc.) and re-bindable
> > > vars.
> > > + may be a better choice, though in the other Lisps it already
> > > indicates constants.
> > > I don’t think ! and ? are good at all, because they really stand out
> > > to me to mean destruction and querying respectively.
> > > - is apparently used only once in the standard libraries: in defn-.
> > > Maybe it would be a good choice.
> > > _ is ugly, but it’s not used at all, so that’s good. Well, except when
> > > used on its own: “_”, for useless bindings.
>
> > > I’m leaning toward +, -, or _.
>
> > > Question 2: Prefix, suffix, or circumfix?
>
> > > +vector, vector+, or +vector+? -vector, vector-, -vector-? Or
> > > whatever. Don’t forget, I’m deciding this for my parser rules library.
> > > “vector” means a rule that can parse strings representing vectors.
>
> > > Could everyone give me their opinion? Which annoys your taste the
> > > least? I still have time to change the style in my library, and I’d
> > > like to hear from as many people as possible.
>
> > > On Feb 25, 3:16 pm, Jarkko Oranen wrote:
>
> > > > On Feb 25, 12:17 am, joshua-choi wrote:
>
> > > > > When it comes to distinguishing certain types of symbols from other
> > > > > things, should one use prefixes or suffixes?
>
> > > > Whichever makes more sense, of course. :)
>
> > > > > Example: naming tests with clojure.test/deftest. If you distinguish
> > > > > your tests’ symbols at all, do you do “t-addition” or “addition-t”?
>
> > > > Name tests descriptively. Putting them in their own namespace helps
> > > > too. If there's absolutely a need to distinguish them from non-tests,
> > > > I would prefer '-test'. Abbreviating it just makes it noisy.
>
> > > > > (I need to know what the standard is, if there is any, because I need
> > > > > a way to distinguish a certain type of symbol—those that represent
> > > > > “rules”— in my libraries. I’m using an underscore suffix right now,
> > > > > like “vector_”, which means “vector-rule” But “_rule” might be better,
> > > > > or even “_rule_”, though the last one might be overkill. In the p
Re: let and nesting
You can also do stuff in the middle of a let; (let [a vala b valb _ (do-something-with a b) c (some-fn a b) d (some-fn a b) _ (do-something a b c d) e (fn ...) f (fn )] (and-whatever-else)) Here _ is just some arbitrary unused variable. Note that you can also reuse existing variables which sometimes make things clearer; (let [a (some...) a (if something x y)] (some... a)) -Rgds, Adrian. On Fri, Feb 26, 2010 at 2:28 AM, kuniklo wrote: > One of my least favorite things about common lisp was the degree of > nesting it required for sequential variable definitions. For common > code like this: > > (let (a vala) > (b valb) > ... do something with a & b... > (let (c (fn a b)) > (d (fn a b)) > ... do something with a, b, c, d... > (let (e (fn ...)) > (f (fn )) > > etc. You eventually get a very deeply nested function simply because > the values of variables assigned later in the code depend on values > determined earlier in the code. From what I can this is also the case > in clojure, correct? > > In contrast, the python/ruby/java approach (which I realize has its > own warts). > a = 1 > b = 2 > c = a * b > d = a + c > e = func(d) > > in which new bindings are automatically created in the current scope, > tends to be more readable in many cases. > > I'm new to clojure so I'm wondering - are there idiomatic ways of > reducing the degree of scope-nesting let incurs or do people just tend > to try to avoid that kind of code with smaller sub functions etc? > > -- > 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: Prefixed or suffixed symbols?
Ah, yes, it is a. (The only thing that I anticipate a computer would
use this for is different syntax highlighting. Actually, can any
Clojure editors change symbols’ colors based on if they match a
pattern like *a*?)
Because Daniel Warner and Jarkko Oranen both said they think
underscores are undesirable, I suspect that a lot of other Clojure
users feel the same too. Right now, I’m thus leaning toward using -
vector-. I’ve just tried replacing all rule symbols in one of my files
with -blah-, and it actually looks a little pretty. If I don’t hear
any other good suggestions, I think I’ll use circumfix hyphens, then.
On Feb 25, 8:31 pm, Sean Devlin wrote:
> Hmmm... maybe I misunderstood your point. Is the intent of your
> naming conventions:
>
> a. Something that is human readable but does not affect the execution
> of code? Examples include placing I in front of interface names, and
> A in front of abstract class names.
>
> b. Something that other code will use to infer behavior? Examples of
> this include JUnit 3.8 & the get/set Java Bean convention.
>
> If it's a, I made a mistake & my comments don't apply (as a matter of
> taste I like suffixes). If it's the behavior version, I think that a
> special macro is in order (e.g. deftest)
>
> Sean
>
> On Feb 25, 10:22 pm, joshua-choi wrote:
>
>
>
> > Could you explain more what you mean? For instance, how are macros
> > related to these questions? This just has to do with informal naming
> > conventions, in the same matter as *e or *print-dup*. Are you talking
> > about that it’s possible for naming conventions to interfere with
> > macros that interpret symbols abnormally if they’re named a certain
> > way?
>
> > Now, I’ve considered just not using any characters to set apart rules
> > completely, but that’ll bring me back to my original problems. The
> > only disadvantage I can think of to using a convention is that it
> > might make code that use rules more noisy...but I think that’s
> > preferable to having to recall what a rule is called if it conflicts
> > with another symbol—which is really common with my rules. What
> > notation do you all think is the least ugly?
>
> > On Feb 25, 7:32 pm, Sean Devlin wrote:
>
> > > I think using a naming convention isn't a good idea, especially when
> > > you have a rich macro system like Clojure. I'm actually going to be
> > > talking about using a reference to handle things like this in my next
> > > episode. For now, you can take a look at my definference macro here:
>
> > >http://github.com/francoisdevlin/devlinsf-clojure-utils/blob/master/s...
>
> > > Hope this helps,
> > > Sean
>
> > > On Feb 25, 8:59 pm, joshua-choi wrote:
>
> > > > Yeah, I don’t really like the underscores either. But I have to work
> > > > with the set of currently allowed non-alphanumeric symbol characters
> > > > (*, +, !, -, _, and ?, according to clojure.org/reader).
>
> > > > There’s actually two different questions here—I’d love for other
> > > > people to bring in their input.
>
> > > > I need to set apart “rules”, a certain type of object, from other
> > > > kinds of Clojure objects. ("Why do you even need to do this?" people
> > > > ask. Because I really want to graphically set them apart in the
> > > > programmers mind. And also, rules often shared names with objects that
> > > > they were representing: it was difficult to remember string-char-r vs.
> > > > string-char in functions, for instance. It was always a big pain. I
> > > > think it will be worth it.)
>
> > > > Question 1: Of the allowed characters, which would be best to
> > > > distinguish rule symbols from other symbols?
>
> > > > * can be confused with the REPL vars (*1, *e, etc.) and re-bindable
> > > > vars.
> > > > + may be a better choice, though in the other Lisps it already
> > > > indicates constants.
> > > > I don’t think ! and ? are good at all, because they really stand out
> > > > to me to mean destruction and querying respectively.
> > > > - is apparently used only once in the standard libraries: in defn-.
> > > > Maybe it would be a good choice.
> > > > _ is ugly, but it’s not used at all, so that’s good. Well, except when
> > > > used on its own: “_”, for useless bindings.
>
> > > > I’m leaning toward +, -, or _.
>
> > > > Question 2: Prefix, suffix, or circumfix?
>
> > > > +vector, vector+, or +vector+? -vector, vector-, -vector-? Or
> > > > whatever. Don’t forget, I’m deciding this for my parser rules library.
> > > > “vector” means a rule that can parse strings representing vectors.
>
> > > > Could everyone give me their opinion? Which annoys your taste the
> > > > least? I still have time to change the style in my library, and I’d
> > > > like to hear from as many people as possible.
>
> > > > On Feb 25, 3:16 pm, Jarkko Oranen wrote:
>
> > > > > On Feb 25, 12:17 am, joshua-choi wrote:
>
> > > > > > When it comes to distinguishing certain types of symbols from other
> > > > > > things, should one use prefixes or suffixes?
>
> > > > > Which
Re: Prefixed or suffixed symbols?
Ah, case "a" is simpler, and I retract my macro suggestions.
As to you question about editors, I know that it's possible to adapt
emacs clojure-mode the change colors based on a regex. That's how it
knows to color something "pink" for a fn in clojure.core, and green
for a fn in the standard library (e.g. clojure.walk). You'll have to
make your own customizations, of course.
Sean
On Feb 25, 10:50 pm, joshua-choi wrote:
> Ah, yes, it is a. (The only thing that I anticipate a computer would
> use this for is different syntax highlighting. Actually, can any
> Clojure editors change symbols’ colors based on if they match a
> pattern like *a*?)
>
> Because Daniel Warner and Jarkko Oranen both said they think
> underscores are undesirable, I suspect that a lot of other Clojure
> users feel the same too. Right now, I’m thus leaning toward using -
> vector-. I’ve just tried replacing all rule symbols in one of my files
> with -blah-, and it actually looks a little pretty. If I don’t hear
> any other good suggestions, I think I’ll use circumfix hyphens, then.
>
> On Feb 25, 8:31 pm, Sean Devlin wrote:
>
>
>
> > Hmmm... maybe I misunderstood your point. Is the intent of your
> > naming conventions:
>
> > a. Something that is human readable but does not affect the execution
> > of code? Examples include placing I in front of interface names, and
> > A in front of abstract class names.
>
> > b. Something that other code will use to infer behavior? Examples of
> > this include JUnit 3.8 & the get/set Java Bean convention.
>
> > If it's a, I made a mistake & my comments don't apply (as a matter of
> > taste I like suffixes). If it's the behavior version, I think that a
> > special macro is in order (e.g. deftest)
>
> > Sean
>
> > On Feb 25, 10:22 pm, joshua-choi wrote:
>
> > > Could you explain more what you mean? For instance, how are macros
> > > related to these questions? This just has to do with informal naming
> > > conventions, in the same matter as *e or *print-dup*. Are you talking
> > > about that it’s possible for naming conventions to interfere with
> > > macros that interpret symbols abnormally if they’re named a certain
> > > way?
>
> > > Now, I’ve considered just not using any characters to set apart rules
> > > completely, but that’ll bring me back to my original problems. The
> > > only disadvantage I can think of to using a convention is that it
> > > might make code that use rules more noisy...but I think that’s
> > > preferable to having to recall what a rule is called if it conflicts
> > > with another symbol—which is really common with my rules. What
> > > notation do you all think is the least ugly?
>
> > > On Feb 25, 7:32 pm, Sean Devlin wrote:
>
> > > > I think using a naming convention isn't a good idea, especially when
> > > > you have a rich macro system like Clojure. I'm actually going to be
> > > > talking about using a reference to handle things like this in my next
> > > > episode. For now, you can take a look at my definference macro here:
>
> > > >http://github.com/francoisdevlin/devlinsf-clojure-utils/blob/master/s...
>
> > > > Hope this helps,
> > > > Sean
>
> > > > On Feb 25, 8:59 pm, joshua-choi wrote:
>
> > > > > Yeah, I don’t really like the underscores either. But I have to work
> > > > > with the set of currently allowed non-alphanumeric symbol characters
> > > > > (*, +, !, -, _, and ?, according to clojure.org/reader).
>
> > > > > There’s actually two different questions here—I’d love for other
> > > > > people to bring in their input.
>
> > > > > I need to set apart “rules”, a certain type of object, from other
> > > > > kinds of Clojure objects. ("Why do you even need to do this?" people
> > > > > ask. Because I really want to graphically set them apart in the
> > > > > programmers mind. And also, rules often shared names with objects that
> > > > > they were representing: it was difficult to remember string-char-r vs.
> > > > > string-char in functions, for instance. It was always a big pain. I
> > > > > think it will be worth it.)
>
> > > > > Question 1: Of the allowed characters, which would be best to
> > > > > distinguish rule symbols from other symbols?
>
> > > > > * can be confused with the REPL vars (*1, *e, etc.) and re-bindable
> > > > > vars.
> > > > > + may be a better choice, though in the other Lisps it already
> > > > > indicates constants.
> > > > > I don’t think ! and ? are good at all, because they really stand out
> > > > > to me to mean destruction and querying respectively.
> > > > > - is apparently used only once in the standard libraries: in defn-.
> > > > > Maybe it would be a good choice.
> > > > > _ is ugly, but it’s not used at all, so that’s good. Well, except when
> > > > > used on its own: “_”, for useless bindings.
>
> > > > > I’m leaning toward +, -, or _.
>
> > > > > Question 2: Prefix, suffix, or circumfix?
>
> > > > > +vector, vector+, or +vector+? -vector, vector-, -vector-? Or
> > > > > whatever. Don’t forget, I’m decidin
ClojureCLR status?
I notice there have been no checkins to ClojureCLR in the last month and a half. Is something big in the works? Is absolutely nothing in the works? :-) If I check out and build the latest sources, how will it compare in terms of functionality to the Clojure main branch? In particular, does it have cutting edge things like protocols, reify, etc? Thanks, Mike -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: let and nesting
On Feb 25, 7:50 pm, Adrian Cuthbertson wrote: > You can also do stuff in the middle of a let; > > (let [a vala > b valb > _ (do-something-with a b) > c (some-fn a b) > d (some-fn a b) > _ (do-something a b c d) > e (fn ...) > f (fn )] > (and-whatever-else)) Thanks. That's the problem I was trying to solve. Unfortunately I think I didn't give a very good example in my first post of the kind of code I'm talking about but it's exactly what you've described - code that assigns values to a few variables, performs some operations with unimportant or no return values, then assigns a few more variables etc. Assigning to _ seems like a easy way to deal with this. -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Vimclojure Performance on Windows
Hi, On Feb 25, 4:46 pm, Vitaly Peressada wrote: > Installed vimclojure-2.1.2 on Windows XP SP3. Have dual-core machine > and 4GB of RAM. In VimRepl > (println "Hello World") takes about 10 seconds. Is this expected? No. Vim shells out to another process. This is the only real portable and stable way to talk to other process with Vim. This is slow. However on my MacBook (dual-core, 1G RAM) the delay is not noticeable. On my crappy Windows Laptop (single-core, 1.7Gh, 2G RAM) at work, the delay is noticeable but well below a second. The only exception is the first command, which (as a side effect) sets up the whole clojure machinery in the background. But subsequent commands should be much faster. > Any suggestions how to speed this up? No clue. You are the first to report such a problem. Sincerely Meikel PS: there is also the vimclojure google group for such support issues. -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: clojure.zip - throws exception
Hi, On Feb 25, 4:19 pm, Amitava Shee wrote: > Just to solidify my understanding, can this be done in the default > namespace (of "user")? Yes. Instead of (ns foo.bar (:require [clojure.zip :as zip])) when setting up the foo.bar namespace you can just use require in the user namespace. However don't forget to quote the arguments! (Quoting the vector below, will also quote any contained symbol!) (require '[clojure.zip :as zip]) Note, that approach 3 does not work in user, because it has clojure.core already referred. So next is already aliased to clojure.core/next. This will only work with a new namespace, or after manually removing the alias to core/next. However I wouldn't recommend to fiddle manually with these things. Also note: there might be different other symbols from a clojure.zip and core which clash. next just happens to be the first one. So with approaches 2 or 3 you would have to extend the excludes accordingly. Sincerely Meikel -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: no source file
On 26 Feb 2010, at 02:21, Glen Rubin wrote: Here is the code I wrote, sqrs.clj: (use '[clojure.contrib.generic.math-functions :only (sqr)]) (defn square-of-sum [coll] "adds up collection of numbers and then squares it" (sqr (reduce + coll))) A different point: if you can sum your numbers using plain +, using generic/sqr is a waste, as it calls multimethod clojure.contrib.generic.arithmetic/* to do a multiplication. Just use #(* % %) instead. Konrad. -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: order of function definition
Hi, 2010/2/25 Meikel Brandmeyer > Hi, > > On Feb 25, 11:24 am, reynard wrote: > > I define a function foo in which it calls an auxiliary function bar, > > which is not yet defined, and a compiler exception is raised claiming > > unable to resolve symbol bar. > > > > Is there a way that I can define the functions in any order I want, > > without taking care of defining the auxiliary function first? Thanks. > > (declare bar) > (defn foo ...) > > (defn bar ...) > I just thought about it, but a very simple macro one could name 'dotopdown could help organize parts of code in a "top down first" approach: (defmacro dotopdown "children forms inside the call to dotopdown will be evaluated in the reverse order, thus allowing a more 'top down first' approach." [& body] `(do ~@(reverse body))) So you can with have the important functions of a group of related functions written first, and the functions definitions on which the important function relies upon written last. (note you'll need to exactly revert the dependency graph order : if you have f1 -> f2 & f3 , f2 -> f3, then you'll define in this order : [f1, f2, f3], the exact inverse order of [f3, f2, f1]) A little example: (dotopdown (defn print-hello [n] (printf (say-hello n))) (defn- say-hello [n] (str "hello " n))) HTH, -- Laurent -- 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
