#clojure log - Jul 17 2010

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0:03 tautologico: is there any nice, built-in 2d matrix data structure available in clojure? or should I roll my own?

0:06 wooby: tautologico: you may consider incanter.Matrix

0:06 tautologico: wooby: will search for it, thanks

0:06 wooby: tautologico: http://wiki.github.com/liebke/incanter/matrices

0:07 zkim: tautologico: Might help: http://measuringmeasures.com/blog/2010/3/28/matrix-benchmarks-fast-linear-algebra-on-the-jvm.html

0:10 tautologico: both links will be useful, thanks

0:45 slyrus: anyone around care to give my toy undirected graph implementation a quick review?

0:45 http://gist.github.com/479247

0:45 clojurebot: http://github.com/hiredman/clojure-dependency-grapher

3:05 slyrus: well, perhaps in the morning then...

5:24 vu3rdd: ,quit

5:24 clojurebot: java.lang.Exception: Unable to resolve symbol: quit in this context

5:24 vu3rdd: oops.. slime-isms..:-(

5:41 vasily_pupkin: hi

5:42 how can i get value linked to symbol via it's name?

5:42 just now i do: (eval (symbol "a"))

7:48 idrop: hi, is there any function that will return a map with keys as keywords when given a map without? i.e ..... {foo 1 bar 2} ----> {:foo 1 :bar 2}

7:52 mikem: idrop: this would work

7:52 ,(reduce #(apply assoc %1 %2) {} (map #(vector (keyword (str (first %))) (second %)) {\a 1 \b 2}))

7:52 clojurebot: {:b 2, :a 1}

7:52 mikem: don't know if there's a function for that

7:54 idrop: mikem: thanks for that! just have to digest it now..

8:04 raek: idrop: this could be useful too: http://github.com/richhickey/clojure/blob/c1c39162608551d50cfb18998d015974b11cfecc/src/clj/clojure/walk.clj#L95

8:05 if you have a multi-leveled structure

8:06 (more here http://richhickey.github.com/clojure/clojure.walk-api.html)

8:10 (defn keywordize [m] (into (empty m) (for [[key val] m] [(keyword key) val])))

8:10 my solution for one level

8:13 ,(let [keywordize (fn [m] (into (empty m) (for [[key val] m] [(keyword key) val])))] {'some-symbol 1, "some-string" 2, 'symbol.with/namespace 3})

8:13 clojurebot: {some-symbol 1, "some-string" 2, symbol.with/namespace 3}

8:13 raek: ,(let [keywordize (fn [m] (into (empty m) (for [[key val] m] [(keyword key) val])))] (keywordize {'some-symbol 1, "some-string" 2, 'symbol.with/namespace 3}))

8:13 clojurebot: {:some-symbol 1, :some-string 2, :symbol.with/namespace 3}

8:13 raek: *ahem*

8:14 mikem: why does a vector not implement ISeq? iow, why does (seq? [1 2 3]) return false?

8:15 raek: you can think of a sequence as some kind of iterator

8:15 that provides a sequential view of something

8:15 in java, an ArrayList is not an iterator, but can provide one

8:16 it's kind of the same in clojure: a vector is not a sequence, but it can make one (with seq)

8:16 a seq is just something you can do first and rest on

8:17 (those functions also call (seq) on their arguments)

8:17 mikem: ok, so the reason vector doesn't implement ISeq is for ... performance reasons? or vectors are just used for different purposes...?

8:17 raek: a vector seq is implemented as something like a reference to the vector and a counter for the current index

8:18 it would be possible to make the vector implement ISeq, but what should rest on it return?

8:18 mikem: ok, it's due to the underpinning implementation then

8:19 raek: seqs and collections are not the same thing

8:19 I think this is a intentional design decision

8:19 mikem: ok, this is something i'll need to deeper understand as time goes on i guess :)

8:20 raek: seqs are just first rest

8:20 and *behaves* as cons cells

8:20 /linked lists

8:22 this might be helpful to understand the rationale: http://clojure.blip.tv/file/734409/

8:22 but beware that the behaviour of rest has changed slightly since then

8:23 rest does not have to return nil if the rest of the seq is empty anymore

8:23 but what it returns should become nil when passed though (seq(

8:23 next behaves as the rest

8:23 mikem: woah, it's 75 minutes of rhickey talking about sequences! awesome

8:24 oh yeah, i'm familiar of the distinction between next and rest

8:28 raek: thanks :) the video is on my to-do list

9:11 raek: wow: http://www.st.cs.uni-sb.de/edu/seminare/2005/advanced-fp/docs/sweeny.pdf

9:11 I had no idea that the ideas of clojure could be such a great fit for game programming

9:12 especially take a look at slide 51 and forward

9:16 another thing:

9:16 is there a simple way of delaying the effects of certain functions until a transaction succeds?

9:17 like how sends to agents are held?

9:17 carkh: sends to agents are also delayed within transactions

9:18 and only sent upon success

9:18 raek: yes

9:18 is there any known way of having this behaviour for other functions?

9:19 lpetit: hello, I'm having trouble with a macro. Maybe I'm not totally awaken, maybe it's subtle ...

9:19 rhudson: Can't you just execute the function in an agent?

9:19 raek: well, I guess so

9:19 lpetit: (defmacro f ([a] a) ([] (f 1))

9:19 raek: but I might not need the serializing effect agents have

9:19 carkh: ,(send (agent) println "coucou")

9:19 clojurebot: java.lang.IllegalArgumentException: Wrong number of args (0) passed to: core$agent

9:20 raek: i.e. all operations are queued up

9:20 carkh: ,(send (agent nil) println "coucou")

9:20 clojurebot: #<Agent@667ed7: nil>

9:20 lpetit: this does not work. (if I call (f) it complains with java.lang.IllegalArgumentException: Wrong number of args (1) passed to: user$f (NO_SOURCE_FILE:0)

9:21 carkh: lpetit: you're calling f with one parameter from your second definition

9:21 when it has either 0 or 2

9:21 lpetit: carkh: ?

9:22 raek: (f) => 1, (f 2) => 2 for me with your definitoin

9:22 carkh: ah sorry wasn't awake either =P

9:23 anyways you're using f as a function in your second definition

9:23 lpetit: carkh, raek: got it. By the time the macro is compiled, I should not emit a direct call to f, or I'll get strange results since f is not totally compiled yet (so cannot correctly macroexpand)

9:23 raek: hrm, aha

9:23 lpetit: carkh: I'm using f as a callable, as can be done with macros, but you're right,

9:23 carkh: (defmacro f ([a] a) ([] `(f 1)))

9:23 lpetit: carkh: yes

9:24 raek: that looks more right

9:24 rhudson: carkh: you could use multiple agents if you're concerned about serialization

9:24 lpetit: carkh: since it's the return value of the macro, it does the job. Thanks guys for the brainstorming

9:24 carkh: raek: carkh: you could use multiple agents if you're concerned about serialization

9:25 =)

9:25 i feel like an agent now

9:26 rhudson: d'oh!

10:15 bmh: What is the random number generator of choice in Clojure? Should I rely on probabilities.random-numbers or call out to something in java? I'm not doing Monte Carlo simulations so the quality of the RNG isn't very important right now

10:37 raek: rand-int is useful

10:37 ,(doc rand-int)

10:37 clojurebot: "([n]); Returns a random integer between 0 (inclusive) and n (exclusive)."

10:40 bmh: That does seem useful.

11:00 defn: hello everyone

11:01 $seen zkim

11:01 sexpbot: zkim was last seen quitting 293 minutes ago.

11:01 defn: $(/ 293 60.0)

11:01 sexpbot: This command is old. Use -> now. It's a hook, so it can evaluate anything, even stuff that doesn't start with parentheses.

11:01 defn: ->(/ 293 60.0)

11:01 sexpbot: => 4.883333333333334

12:07 Lajla: defn, does Clojure support tail calls?

12:10 raek: clojure does not, since function calls build on top of jvm method invokations

12:10 Lajla: raek, HAH

12:10 You fell for me trap.

12:10 I did not say taill cal optimization, now did I.

12:10 Also, invokation?

12:10 raek: Lajla: ah, now I get it

12:10 sure, you can do tail calls :)

12:11 Lajla: I can feel my sanity sleeping away between the holes of my teeth, I try to to keep my mouth shut and keep it in, but it is not working

12:11 slipping

12:12 raek: invoKe, invoCation

12:12 English, tsk tsk tsk

12:12 "Also, invokation?" <-- was that regarding the spelling?

12:14 Lajla: raek, I was just asking if it was the proper one.

12:14 No hard feelings

12:14 raek, but french me, french me passionately to keep my sanity in.

12:17 raek: I don't take offence on behalf of the English spelling system

12:17 so, it's cool

12:26 Lajla: raek, MY SANITY

12:26 I am losing it lke we lost the world cup.

12:26 Bloody hell, that octopus bought my sanity from that ref.

12:26 That was a clear offside in my sanity.

12:26 Now the Spanish have it and they will use it to become the second best programmers in the world.

12:29 raek: Lajla: write a programming book.

12:29 Lajla: raek, hmm

12:29 and excellent suggestion

12:29 I was busy expressing the formal semantics of that language in FOL anyay.

12:30 raek, shall I dedicate it to you?

12:31 raek: your choise

14:01 defn: Lajla: choice ;)

14:01 Lajla: defn, what?

14:02 defn: he said choise -- it is choice, like your invokation vs invocation

14:17 raek: I always get that wrong... :)

14:18 defn: raek: what's new

14:18 whatcha workin on today

14:35 LauJensen: I know we've talked about some of the UI options for Java before, but please remind me. We have Swing/AWT (ewww), and then Qt which is a little nicer but not fully baked yet, then there are those funky Mac Components, anything else?

14:35 (thats nice ofc)

14:36 qbg: SWT?

14:37 LauJensen: Isnt that as vile as SWT ?

14:37 Raynes: I thought Qt was pretty much abandoned?

14:38 Jambi, that is.

14:39 LauJensen: Raynes: I dont think so, but as anything OpenSource it crawls

14:39 It was neeearly good when they dropped official support

14:42 bobo_: javaFX?

14:43 LauJensen: bobo_: Not available through Clojure

14:43 bobo_: suspected that

14:44 Raynes: There is that Pivot thing.

14:44 LauJensen: Got link?

14:45 I also wonder why the web isnt drowing in these SetLookAndFeel UIs for Java

14:47 Raynes: LauJensen: http://lmgtfy.com/?q=Java+pivot

14:48 http://pivot.apache.org/

14:48 bobo_: that looks like web gui's to me?

14:49 Raynes: Someone mentioned it here in the context of desktop GUIs a while back.

14:49 I've never investigated.

14:49 LauJensen: Sure does - And at least in Conkeror they suck the life out of the browser

14:50 "Apache Pivot is an open-source platform for building rich internet applications in Java. It combines the enhanced productivity and usability features of a modern RIA toolkit with the robustness of the Java platform. Pivot applications are written using a combination of Java and XML and can be run either as an applet or as a standalone, optionally offline, desktop application. "

14:51 Hodapp: BINGO!

14:51 ...oh, wait, we weren't playing web 2.0 buzzword bingo.

15:02 LauJensen: Hodapp: No we always save that for later, when the whole gang is here

15:07 Plouj: is forexmercenary written in clojure? : http://www.forexmachines.com/reviews/forex-mercenary/#comment-5592

15:08 LauJensen: Raynes: Thanks for pointing to Pivot, its very interesting

15:08 Raynes: You're welcome. <3

15:08 LauJensen: Plouj: Certainly looks like it

15:15 eshira: Hi, I'm trying to setup clojure on os x. I git cloned clojure and clojure-contrib, built it, and symlinked the jars into ~./clojure/clojure.jar and ~./clojure/clojure-contrib.jar

15:16 first question, how do i run the repl w/ jline (i have this dependency)?

15:19 second, i'm trying to setup vimclojure. I follow the instructions (http://kotka.de/projects/clojure/vimclojure.html) to build PrettyPrinter. But i still get erros about it not finding it: java.io.FileNotFoundException: Could not locate clojure/contrib/pprint__init.class or clojure/contrib/pprint.clj on classpath.

15:20 slyrus: hmm... what does this warning mean? Warning: protocol #'ugraph/Edge is overwriting method nodes of protocol Graph

15:21 LauJensen: osx..vim-clojure... I think Im staying away from this one :)

15:21 * slyrus knows enough vi to get emacs built

15:22 Raynes: There is a vim-clojure ggroup that seems to be active enough: http://groups.google.com/group/vimclojure

15:35 eshira: *sign* i've gotten this whoel setup working once on another mac..

15:35 there are just wayyyy too many ways (pacakage managers, manual installs) to do it

15:40 technomancy: eshira: with swank at least the main problem is everyone posts on their blog about how they think they've got it figured out, and nobody reads the official documentation

15:48 slyrus: anyone up for helping solve a defprotocol/defrecord problem? i don't understand why the last two forms in http://gist.github.com/479786 give different results

15:50 raek: is edged both a method name and a field name?

15:50 *edges

15:51 maybe edges in (bar [g node] (edges g node))) resolvs to the field instead of the method

15:51 slyrus: why, yes it is. ok, thanks!

15:51 raek: np

15:53 * slyrus still doesn't quite understand what fields _are_. I thought I needed to do (:edges g) to get the contents of the field.

15:53 slyrus: raek: is this a defprotocol bug or just my lack of grokking how this is supposed to work?

15:53 raek: you can get the value of a field by just using it's name

15:54 they work a bit like locals

15:54 slyrus: locals?

15:54 raek: local "variables"

15:54 like a surrounding let

15:54 rhudson: within the defrecord scope

15:55 slyrus: thanks rhudson

15:55 raek: (they're not exactly variables, since they cannot be mutated)

15:55 slyrus: they're akin to CLOS accessors then? but outside of the defrecord scope I still have to do (:edges g)?

15:56 raek: (:edges g) is how you access the field from the outside of a record, yes

15:56 fields are like instance variables in java classes

15:57 I'm not familiar with CLOS vocabulary, but I would call :edges an accessor

15:57 slyrus: right, but inside the defrecord scope there's _another_ accessor (edges ...) that returns the value of the field, right?

15:58 or the same accessor called by a different name

15:58 raek: no, you don't call it

15:58 use use the name as if it was a variable

15:58 (bar [g node] edges)

15:58 slyrus: "(edges g)" isn't a function application?

15:58 raek: it is, but edges is not a functoin

15:59 edges contains the value

15:59 slyrus: is used to a lisp-n

15:59 * slyrus i mean

16:00 raek: in the scope of a record method, the name of the fields are bound to the field values

16:01 (defrecord pair [one two] SomeProto (some-method [p x y] (+ (* x one) (* y two))))

16:02 nonsensial example...

16:02 this could also be written with the accessors:

16:02 (defrecord pair [one two] SomeProto (some-method [p x y] (+ (* x (:one p)) (* y (:two p)))))

16:04 "The class will have the (immutable) fields named by fields, which can have type hints. [...] Note that method bodies are not closures, the local environment includes only the named fields, and those fields can be accessed directy."

16:05 slyrus: but (defrecord pair [one two] SomeProto (some-method [p x y] (+ (* x one) (* y two))) (one one)) would allow me to say (one p) from outside of the defrecord scope, right? Otherwise I'd have to do (:one p), I think.

16:05 (for suitable values of p, of course)

16:05 qbg: No

16:05 slyrus: I mean (one [p] one)

16:05 yason: Decided to try 1.2 beta on Ubuntu; none of the installation tutorials did the trick. Are things in clojure/slime/swank-clojure world in order or should I debug into it once again?

16:06 qbg: Oh, yeah then

16:06 raek: slyrus: then "one" could mean one of two things

16:07 which can be confusing for someone reading the code

16:07 if you want to hide the fact that thefunctionality is implemented with records, give the fields other names

16:07 slyrus: not for those of us coming from a lisp-n background where if you wanted the accessor one you would have to say #'one :)

16:07 raek: since they will not be visible to the user

16:07 slyrus: right, I'm starting to come to the realization

16:08 raek: if the fact that they are records is a part of the API, then using :edges as accesor functions should be fine

16:09 *should be sufficient for getting the work done

16:10 I don't know if naming conventions for these things have came up, since records are still pretty new

16:11 slyrus: ok, works as expected now. thanks for your help!

16:25 can I have methods of the same name in different protocols?

16:26 raek: yes, but not in the same namespace

16:26 they are still used as functions

16:26 slyrus: so, no, in other words :)

16:26 raek: exactly... :)

16:27 slyrus: Ok, defrecords being able to implement multiple interfaces makes it easy enough to factor the common stuff out into its own interface

16:27 raek: in java, classes both group together functions (as methods) and play the role of namespaces

16:27 in clojure, these are separated

16:27 slyrus: clojure-mode could use some defrecord love

16:28 raek: if to things have the same name, they should probably do the same thing too

16:28 (unless the term itself is ambigous)

16:29 the indentation?

16:29 that has ben bugging me too

16:29 slyrus: yeah two more spaces in for the methods (is that the right term?) so that they're to the right of the protocol names would be nice

16:30 oh, and I'm still getting used to seeing CamelCase identifiers in my lispy code :)

16:30 raek: agreed.

16:31 I think "methods" is an accepted term

16:31 the docs uses that word anyway

16:34 slyrus: can I specify protocol methods with variable arity?

16:35 caio: how can I extend a namespace?

16:36 slyrus: e.g.: (defprotocol Moose (foo [x]) (foo [x y]))

16:36 yason: A follow-up question: What's the situation with swank-clojure? Usable with 1.2?

16:36 slyrus: i'm using it

16:37 raek: caio: if you're at the the repl, just (in-ns 'the.name.space) and define stuff

16:37 using it too

16:37 slyrus: oh, nvm... i already discovered how to do that yesterday, and promptly forgot...

16:37 raek: the docs in swank-clojure is the most up to date

16:38 yason: slyrus: latest from git://github.com/jochu/swank-clojure.git?

16:38 raek: take technomany's instead

16:38 slyrus: yason: I use http://github.com/technomancy/swank-clojure.git

16:38 raek: he's the maintainer now

16:38 yason: oh, there are *two*?

16:38 ok

16:38 no wonder mine had "NOTE: swank-clojure.el is currently unmaintained."

16:38 raek: jochu was the original maintainer, I think

16:39 yason: yeah, makes sense

16:39 raek: yes, it's bad that jochu's the one that comes first on google

16:40 yason: for us who update their clojure a few times a year, this begs for an intelligent setup script. It's always the same trial-google-and-error hassle

16:40 raek: 21:38 < technomancy> eshira: with swank at least the main problem is everyone posts on their blog about how they think they've got it figured out, and nobody reads the official documentation

16:40 I do git pull origin on clojure-mode, swank-clojure and slime

16:41 but my .emacs is a mess

16:41 no packages

16:41 yason: raek: yeah, I've noticed that. But people love things where documentation isn't needed :)

16:42 raek: yason: here is my .emacs: http://gist.github.com/443590

16:43 the important line is (ad-activate 'slime-read-interactive-args)

16:43 yason: raek: thanks, I'll cross-check with mine

16:43 raek: it is required if you don't use ELPA, I think

16:46 I think there are clojure-mode forks on github that fixes record indentation too

16:46 anyone else notices that dosync and future indents the body *one* space?

16:47 caio: raek: Im trying to extend the namespace clojure.contrib.sql, I created a (ns extended.sql), how can I import all functions of clojure.contrib.sql into this namespace?

16:47 cemerick: I wonder if anyone knows off-hand where the discussion about case dispatch can be found (e.g. using lists for grouping multiple dispatch constants, etc)?

16:48 I think it was here, but I've not had any luck googling.

16:48 caio: look, I have to call (:require extended.sql) then have all functions defined in contrib.sql too

16:48 raek: there's immigrate in c.c.ns-utils

16:49 but it has caveats

16:50 caio: whats "the right way (tm)" for doing this type of thing?

16:50 raek: namespaces are not designed to be copied and extended, I think...

16:50 caio: use immigrate?

16:50 yason: raek: swank-clojure automagically offered to install 1.1, did you say you tweaked it to work with 1.2 too?

16:50 raek: what is the usage scenario?

16:51 yason: don't use the auto features

16:51 caio: i need to extend contrib.sql to support returning insert-id when I insert rows

16:51 and other stuffs like this

16:51 raek: I think that is ELPA trying to download its latetest version

16:51 which is not the one on github

16:52 caio: the most common way (I think) would be to have your extensions in your own namespace

16:52 and a user that want's to use te original sql API plus your simply uses both

16:52 yason: raek: it didn't seem to find my clojure 1.2 eventhough I pointed swank-clojure-jar-path to it -> tried the automatical features to see if they would add some setup lines to .emacs or .emacs.d

16:53 * slyrus is beginning to miss reinitialize-instance and friends

16:54 raek: have you added to the load path?

16:54 yason: raek: you mean emacs load path?

16:54 raek: yes

16:55 yason: raek: they're good

16:55 raek: I'm not an emacs guru...

16:55 so I don't know how to debug emacs probelms

16:56 yason: I know emacs, I know clojure, but only slightly about the internals of slime and even less about swank-clojure

16:56 well, i'll take a look at that tomorrow

16:56 raek: you might have to delete the packages ELPA have downloaded

16:57 I only use the 3 git projects + the .emacs file you saw, nothing more

17:00 slyrus: i had to turn off slime-autodoc to get things working well :(

17:00 not sure if that's still the case though

17:06 yason: raek: I had deleted elpa stuff already, just trying to find out how to point swank-clojure to *my* clojure.jar

17:07 raek: (setq swank-clojure-jar-path "path/to/clojure.jar")

17:12 Lajla: IN YOUR HEEEEEEAAAAD, IN YOUR HEEEEEAD.

17:12 * qbg wonders what functions would benefit from a fast nth for seqs

17:12 Lajla: qbg, functions used by people that are bad at functional programming and try to duplicate imperative.

17:13 qbg: take-nth would benefit

17:17 Ooh, you could make lazy vectors with that

17:18 Well, not vectors, but a lazy indexed sequence

17:27 Lajla: qbg, indexing lists, or indexing at all really has little palce in functional style I think.

17:27 I know of no library function in any functional language except one that indexes itself that I have seen implemented using indexing.

17:28 qbg: first/rest places limits on the computational complexity of algorithms

17:28 Lajla: People always say that lists are slow on indexing, and they are, that is why they are not used for that in general.

17:28 qbg, well, functional style usually means you do stuff with all the elements in the list.

17:28 And not pick them out accordingly runtime information

17:28 You tend to transform lists, not select elements from them.

17:30 qbg: But sometimes you do select elements from them

17:31 (this is all just an excuse for me to play with protocols)

18:13 Nanakhiel: qbg, name me an example?

18:13 I would be most gracious

18:14 qbg: Nanakhiel: Of?

18:15 Lajla: qbg, explain?

18:15 How does one binary search a list?

18:15 qbg: The same way you normally perform a binary search

18:16 Lajla: qbg, I just mean, why binary search a list when you can also binary search a vector.

18:16 I think that actually first converting it a vector is going to end up faster than if you were to index from the start all over again, of course, that is not needed if you do it smartly.

18:16 qbg: An indexable list is an abstraction

18:16 Lajla: No it's not!

18:17 It's a binary tree whose rightmost leave is null.

18:17 Do not let the people who tell you that it is anything other confuse you

18:18 qbg: How is it not an abstraction?

18:18 Lajla: qbg, because it is what it is.. =(

18:18 A binary tree

18:18 which like any binary tree supports exactly two operations

18:18 left branch, right branch

18:19 qbg: Instead of first/rest, you have first/rest/nth

18:19 Lajla: NO YOU DOOON'T

18:19 You have car and cdr.

18:20 rest is a nondescriptive name.

18:20 first and second are good too.

18:20 rhudson: Wrong language Lajla

18:20 Lajla: You are frightening me with your conceptualism.

18:20 * Lajla goes to hide inside Chousuke's eye sockets.

18:20 Lajla: HEY, there are already eyes in here.

18:20 * Lajla tears them out first

18:21 * Lajla finds out he does not fit, but at the least gives it a puch and see if he can wrenches himself in

18:21 qbg: Hmm.. Perhaps I should make it first/rest/nth/nthrest

18:22 Lajla: WAAHH

18:22 So you're like implementing them on top of ARRAYS?

18:22 qbg: I can get a vector in terms of my abstraction

18:23 I can get a sequence of the form (map f (range length)) in terms of my abstraction

18:24 Lajla: Every time you do this, a lisp machine dies...

18:24 Say you believe in cons pairs.

18:25 qbg: No love for hunks?

18:25 ;)

18:25 (http://maclisp.info/pitmanual/hunks.html)

18:38 claj: how to get the clojure.set.union (and other set-functions) to work? I've tried (clojure.set.union #{1 2 3} #{4 5 2}) without results... is it my classpath?

18:39 I get java.lang.Exception: Unable to resolve symbol: union in this context (NO_SOURCE_FILE:16)

18:39 Raynes: ->(clojure.set/union #{1 2 3} #{4 5 2})

18:39 sexpbot: => #{1 2 3 4 5}

18:39 claj: big thx^inf

19:03 Lajla: qbg, my toy lisp has that actually, vectors are homogenous, so I invented tuples for hetrogenous random access, then I realized that a tuple of 2 is essentially a cons cell

19:11 somnium: Lajla: see SRFI 101 -> some percentage of schemers no longer believe in cons cells either

19:12 at least not of the 'look ma, its just like the lambda calculus' variety

19:13 Lajla: somnium, actually, I just like to be insane, in reality I have given the issue _a lot_ of thought in my own toy lisp and am leaning towards cons pairs which are just a special case of tuples in thend.

19:14 I considered storing the length of the list in it too but I figured in the end that tail-hopping was going to have too much overhead to be worth it unless every cons pair had to store the length of what was to come.

19:16 technomancy: "Just like grandma used to make!"

19:18 Lajla: My grandma used to make me fish eyes.

19:18 I still eat them.

19:18 It grosses people out.

19:24 Probably some Chinese thing though, I hear it's normal in the... our culture.

19:52 somnium, dicisne latinam?

19:53 somnium: nil

19:53 Lajla: I like your response

19:53 * Lajla eats somnium for that fine response

20:51 ericthorsen_: o where do type hints go with defrecord and deftype on the fields that are not ints or floats? It appears everything turns into Object otherwise. Is thing information used/stored anywhere in the genned class?

20:51 so

20:56 so where do type hints go with defrecord and deftype on the fields that are not ints or floats? It appears everything turns into Object otherwise. Is thing information used/stored anywhere in the genned class?

21:46 bmh: I've got a list of characters '(\a \b \c), what's the proper way of turning that into a bonafide string?

21:47 rhudson: ,(apply str '(\a \b \c))

21:47 clojurebot: "abc"

23:38 TimMc: Raynes: Where do you want feedback on try-clojure.org?

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