#clojure – 2011-02-05

2011-02-05

01:14	irc_newbie	howdy
01:15	ieure	Hello.
01:24	mec_	is there a variant of (source) that will show all the methods of a multimethod?
01:26	amalloy	mec_: i don't think so, but see (.getMethodTable print-dup)
01:26	danlarkin	amalloy: clojure.core/methods
01:26	danlarkin	(doc methods)
01:26	clojurebot	"([multifn]); Given a multimethod, returns a map of dispatch values -> dispatch fns"
01:27	amalloy	danlarkin: ah. a nice sugar for the above
01:28	mec_	I tried that but just a bunch of "Source not found"
01:30	sritchie	amalloy: problem solved with cascading, btw -- there was indeed a way to serialize primitives without any special wrapper, it's just "off" by default
01:31	amalloy	mec_: i don't think defmethod attaches metadata to the methods
01:31	amalloy	so you can't find the source
01:31	sritchie	amalloy: I'm using your method, of pushing to a DataOutputStream, I just don't have to pretend to be a byte array anymore
01:31	amalloy	sritchie: convenient
01:31	sritchie	amalloy: less shameful!
01:32	amalloy	buffers and channels are supposedly the "new thing", and definitely faster if you care about that
01:33	sritchie	Unfortunately I have to conform to this interface: http://hadoop.apache.org/common/docs/r0.20.0/api/org/apache/hadoop/io/serializer/Deserializer.html
01:34	sritchie	amalloy: but I hear you
01:34	amalloy	sritchie: whoa, implementing serialization yourself. i wonder if thrift might be easier
01:34	danlarkin	interfaces are awesome because you can reify them
01:34	danlarkin	it's subclassing that sucks
01:35	amalloy	or avro i guess, for hadoop
01:35	amalloy	danlarkin: i don't think anyone was complaining about interfaces
01:35	danlarkin	just commenting
01:35	sritchie	danlarkin: I was just pointing out that it forced me to use streams
01:36	sritchie	amalloy: for anything other than these primitive arrays, I'll certainly check out thrift, or some other serialization framework
01:36	sritchie	the next thing I'll have to stream will most likely be parallel colt matrices
04:13	fliebel	morning
04:14	fliebel	Is anyone here capable of navigating the Java XML jungle? I found a SAX serializer, which is what I thought I needed, but it says it's deprecated, and lists 2 other options I can't find.
04:15	fliebel	"This class was deprecated in Xerces 2.9.0. It is recommended that new applications use the DOM Level 3 LSSerializer or JAXP's Transformation API for XML (TrAX) for serializing XML. See the Xerces documentation for more information."
04:42	fliebel	Java makes fliebel angry :(
04:46	fliebel	Why! A DocumentBuilderFactory, that produces DocumentBuilders, that can make Documents. Just give me the document, all right?
04:48	jkrueger	fliebel: so you are a JavaAversionAccumulator ?
04:50	fliebel	jkrueger: Yes, and making a XmlDslFactoryGeneratorFactoryCreator
04:50	fliebel	You know, like Hiccup, but for XML, with namespaces and all.
04:52	fliebel	The problem is that I can't find a way to simple generate some XML with Java. When I was on the point where I thought I found it, I noticed it said 'deprecated'.
04:53	gregh	you can always just write text
04:53	jkrueger	at times one gets the feeling that some java APIs get deprecated before they ever get released
04:54	fliebel	gregh: Before I started, I was under the impression there was a wealth of great XML libraries for Java.
04:57	gregh	if by "great" you mean "Very big, large scale", I think you found them. :)
04:59	fliebel	gregh: The real problem is that that also seems to imply "business talk, complicated" and also "you know this stuff, right? so why explain?"
05:00	fliebel	Anyway, I finally found some examples how to write a DOm Document to XML, so with a dozen lines of factory cruft, that will get me there I think.
05:05	fliebel	I'll call my lib ArmageDOM, or WisDOM or SAXophone, or XMJ(eXtended Markup Jumble), or… any suggestions?
05:08	jkrueger	i like SAXophone
05:08	jkrueger	but would have expected that to be a library name already
05:09	fliebel	jkrueger: Me to, but I am not technically using SAX. I was on the SAX trail, but I can;t find a decent serializer/writer
05:12	jkrueger	DOM minion
05:12	fliebel	DOMino :)
05:12	gregh	DOMmage
05:13	fliebel	gregh: ?
05:14	gregh	from the french expression "quel dommage" : "what a shame"
05:15	fliebel	http://en.wiktionary.org/wiki/dommage
05:16	entropie	DOMINATION!
05:23	fliebel	What I need is an implementation of org.xml.sax.ContentHandler that writes the tags somewhere.
05:48	fliebel	Huh? I try (.newInstance DocumentBuilderFactory) on http://download.oracle.com/javase/1.5.0/docs/api/javax/xml/parsers/DocumentBuilderFactory.html#newInstance() and get java.lang.IllegalAccessException: Class user$eval373 can not access a member of class javax.xml.parsers.DocumentBuilderFactory with modifiers "protected"
05:50	fliebel	That constructor is protected, so you have to use newINstance, and then get the protected error...
05:51	fliebel	this works: (. DocumentBuilderFactory (newInstance))
05:52	fliebel	Why?
05:52	clojurebot	why not?
08:13	raek	fliebel: sometimes the reflector finds a private or protected method to be a better match type-wise
08:14	raek	fliebel: if the method or constructor is overloaded, and some of the overloaded variants are not public, you can use type hints to force the reflector to pick the right one
08:15	fliebel	raek: But why does that mean that
08:15	raek	this is common when you have an instance of a private private class that implements a public interface
08:15	fliebel	(.newInstance DocumentBuilderFactory) does not work while (. DocumentBuilderFactory (newInstance)) does?
08:18	fliebel	I thought one was sortof a macro for the other.
08:20	raek	fliebel: I think (.method object) is only for instance methods
08:20	fliebel	ah
08:20	raek	try (DocumentBuilderFactory/newInstance)
08:21	fliebel	facepalm
09:55	fliebel	There must be a better way that doing mutual trampoline recursion…
11:02	fliebel	phew, it's working. https://github.com/pepijndevos/ArmageDOM
11:06	fliebel	In only need to figure out a way to make it recursive in a good way.
11:09	LauJensen	How do I open a regular cake/clojure project in Eclipse?
11:09	fliebel	I am currently in a situation where I have recursive mutual recursion. (I don't know a better wording for it)
11:14	ejackson	LauJensen: WHAT ? You must have had one too many Fishshots last night my man... I can't believe I'm seeing you using something outside emacs :P
11:14	LauJensen	ejackson: Im trying to help out a customer :)
11:15	fliebel	LauJensen: Is Eclipse one of those IDEs that only let you open eclipse project files?
11:15	LauJensen	Yes
11:15	LauJensen	I know lein has a plugin somewhere which creates such a file
11:16	fliebel	LauJensen: Well, what Cake feature do you need that prevents you from using Leiningen to generate that file?
11:18	LauJensen	My projects are usually quite firmly married to Cake, but I think I would be able to run the plugin even still
11:18	LauJensen	Just not build the project
11:37	defn	LauJensen: when you say firmly married, do you use a lot of cake plugins or have custom tasks or something?
11:37	defn	do you mean you use*
11:42	LauJensen	defn: custom tasks primarily
11:59	robonobo	yo
12:10	fliebel	robonobo: yo
12:26	cinch	&(meta '(a))
12:26	sexpbot	⟹ {:line 1}
12:26	cinch	&(meta '[a])
12:26	sexpbot	⟹ nil
12:27	cinch	why is line added on a list?
12:31	fliebel	cinch: I think for debugging.
12:31	fliebel	Since most of the time lists are used for code, it is good to know where they are when one raises an exception.
12:31	cinch	makes sense, was wondering why it's not on a vector
12:36	fliebel	What operations do and don't retain the meta of an object?
13:07	amalloy	fliebel: i'd tend to assume (wrongly, i'm sure), that no operations retain the meta, to avoid problems
13:12	amalloy	also, fliebel, findfn is fixed:
13:12	amalloy	$findfn + [1 2 3] 6
13:12	sexpbot	[clojure.core/reduce clojure.core/apply]
13:15	cinch	fliebel: " In general, collection functions (conj, assoc, dissoc, and so on) are supposed to preserve metadata,
13:15	cinch	while sequence functions (cons, take, drop, etc.) are not. But there are exceptions. In Clojure 1.0, conj on
13:16	cinch	(from practical clojure)
13:29	fliebel	amalloy: Great, great :)
13:30	fliebel	cinch: Thanks, I shoudl look what Joy of Clojrue hast to say on the issue.
13:37	amac	Is there a form which allows something similar to loop/recur (tracking intermediate state while iterating over a series of elements) but with multiple recur points in the loop?
13:37	amac	...hard to phase that question
13:37	amalloy	amac: i think the best you can do is multiple loop forms
13:37	amalloy	but iterate or reduce may be able to do what you want in a different way
13:39	amac	my problem is that in some cases I need to do extra passes over the elements, so they get temporarily skipped but processed later
13:40	amalloy	amac: and you can't condense that into a single pass of multiple-step processing?
13:42	amac	I can't think of a way to do it that won't fail in some edge cases
13:43	amac	basically its a graph traversal, but if the graph contained disjoint subsets (groups of elements with no relation to other groups) it would break on a single pass
13:46	amac	...going to hack away at this some more, thank for the input
13:47	amalloy	amac: maybe it's hammock time :)
13:50	amac	amalloy: gotta watch that talk again :)
13:52	fliebel	amac: What does this disjoint subset graph look like? I can't really imagine what you're talking about.
13:57	amalloy	fliebel: a graph with points ABCDE: DE are connected, ABC are all interconnected, but no links between the groups
13:57	amac	say you have a graph of 6 elements, 1 2 3 are connected and 4 5 6 are connected
14:00	amac	the issue is that if you have a 7th element that connects 3 and 4 then they're no longer disjoint and need to be processed again
14:03	fliebel	amac: So it's a seq of connections? And what do you do with them? I understand what disjoined sets look like, but the representation and iteration is where I run into trouble.
14:03	clojurebot	c'est bon!
14:07	amalloy	clojurebot: your tendency to treat any sentence containing the word is as a definition is frequently misguided
14:07	clojurebot	In Ordnung
14:09	amac	fliebel: yeah, its a seq of elements. I do a pass over the elements separating them into two sets based on their relationship, but if I hit an element without a relationship to one already processed its either disjoint (needs to be processed as its own graph) or needs to be processed when another element has been processed which has a relation to it
14:12	fliebel	I think reduce works. As I understand it, you could have the initial value as an empty seq of subgraphs, and then, for every element, either start a new subgraph, add it to one, or if it connects 2, concat them.
14:13	amalloy	fliebel: seconded
14:15	amalloy	amac: that would get you the set of disjoint graphs in one pass, and then you can work on each of them individually
14:15	fliebel	Remotely related: You could make a zipper for a graph, and have it walk in circles :D
14:16	amalloy	although, fliebel, i suspect you could speed things up by having the reduce/accumulator value be a map of nodes to the subgraph they're in, so that you can do fast lookup of the two endpoints of a node to see what graph they're in
14:16	amalloy	rather than a seq
14:18	fliebel	amalloy: I would agree with you, if I had any understanding of graphs.
14:20	amalloy	anyway, i'm off. ta-ta
14:21	fliebel	bye
14:21	amac	man, you're right that would simplify life considerably... most of the headaches were from pickning out the disjoint elements.
14:22	fliebel	amac: When you're done, I'd love to see it. I'm curious to the graph stuff.
14:24	amac	fliebel: sure
14:45	fliebel	oooh, now even node and redis have hosted services. waiting for clojure...
14:48	sritchie	hey all -- what's the best way to split a string in half? I have "003002", and want two strings "003", "002" -- I can do a clojure.contrib.string/partition by a regex matching a 3 digit number, but that feels clunky
14:51	sritchie	,(map (partial apply str) (partition 3 (drop 2 "12003002")))
14:51	clojurebot	("003" "002")
14:52	sritchie	actually, this is the end goal:
14:52	sritchie	,(map #(Integer/parseInt %) (map (partial apply str) (partition 3 (drop 2 "12003002"))))
14:52	clojurebot	(3 2)
14:56	fliebel	&(let [s "1234567890"] (map (partial apply str) (split-at (/ (count s) 2) s)))
14:56	sexpbot	⟹ ("12345" "67890")
14:57	fliebel	You use of partition and drop seems to suggest you don;t just want to split it.
14:58	fliebel	sritchie: ^
14:59	sritchie	fliebel: sure, I should describe what I'm doing -- I've got a string of the form "DDXXXYYY", where XXX and YYY are representations of integers (x and y coordinates of a NASA MODIS tile)
14:59	sritchie	fliebel: I don't care about d -- I just want those two substrings, represented as integers
14:59	sritchie	s/d/DD
14:59	sexpbot	<sritchie> fliebel: I DDon't care about DD -- I just want those two substrings, representeDD as integers
15:02	fliebel	&((juxt #(subs % 2 5) #(subs % 5 8)) "DDXXXYYY")
15:02	sexpbot	⟹ ["XXX" "YYY"]
15:04	fliebel	sritchie: In that case, this is the best I can do.
15:05	fliebel	It even doe structural sharing with the original string :)
15:05	sritchie	fliebel: haha, more efficient than mine!
15:06	sritchie	it'd be nice if clojure.contrib.string had a partition method that took a number n, like core's
15:06	sritchie	rather than just a regex
15:06	anthony__	I'm stuck on something that I think is trivial. I want
15:07	anthony__	to have a separate thread print "Hi", and (future (println "Hi")) works for that.
15:07	anthony__	But (repeatedly 5 (future (println "Hi"))) doesn't work (to do 5 threads). What am I doing wrong?
15:07	fliebel	sritchie: There is clojure.string now ;)
15:07	fliebel	anthony__: repeatedly takes a function.
15:08	anthony__	sigh Thanks...I knew that, too.
15:08	fliebel	But you want pmap or pcalls I think.
15:08	anthony__	Ah! I tried pmap first, but it didn't quite work. Never heard of pcalls, and it looks perfect.
15:09	fliebel	or pvals if you don;t want to make functions ;)
15:09	markskilbeck	Hi, all. Regarding convention, when does one use naming such as symbol?
15:10	fliebel	markskilbeck: For vars that can be dynamically changed, via binding.
15:10	sritchie	markskilbeck: earmuffs! from the clojure assembla:
15:10	sritchie	Use earmuffs only for things intended for rebinding. Don't use a special notation for constants; everything is assumed a constant unless specified otherwise.
15:10	sritchie	http://www.assembla.com/wiki/show/clojure/Clojure_Library_Coding_Standards
15:10	markskilbeck	fliebel, sritchie: Thank you very much.
15:10	anthony__	fliebel: I'm having trouble finding documentation for pvals. Is that in a separate library? (doc pvals) doesn't work in my REPL
15:11	fliebel	oh maybe it's pvalues or whatever.
15:11	markskilbeck	,(doc pvalues)
15:11	clojurebot	"([& exprs]); Returns a lazy sequence of the values of the exprs, which are evaluated in parallel"
15:11	anthony__	fliebel: markskilbeck: Thanks. Sorry for the trivial questions.
15:13	sritchie	,(map (partial subs "11222333") [2 5] [5 8])
15:13	clojurebot	("222" "333")
15:13	sritchie	works, but is misleading!
15:15	fliebel	&(map (partial apply subs "11222333") [[2 5] [5 8]])
15:15	sexpbot	⟹ ("222" "333")
15:17	sritchie	fliebel: not misleading anymore
15:17	fliebel	&(map (partial apply subs "11222333") (partition 2 1 (range 2 9 3))) ; evil
15:17	sexpbot	⟹ ("222" "333")
15:18	fliebel	&(map (partial subs "11222333") (range 2 6 3)(range 5 9 3))
15:18	sexpbot	⟹ ("222" "333")
15:19	fliebel	okay, the [[2 5] [5 8]] was the best
15:19	sritchie	on monday, I'm going to get the other two guys on my team switched over from python to clojure --
15:20	sritchie	I'll include all of these as anonymous functions with documentation, to give them some samples of
15:20	sritchie	the many ways to slay a fn
15:20	fliebel	sritchie: What kind of stuff are you working on?
15:21	sritchie	fliebel: a hadoop project, using nathanmarz's cascalog, to predict deforestation rates in tropical areas
15:21	sritchie	we're using NASA's MODIS tile data, with a few other sources
15:21	sritchie	MODIS tiles supply their TileID in that "AAXXXYYY" format... I just needed a quick parser to get the x and y coordinates of a tile
15:22	fliebel	sritchie: So you're actually changing from Python to Clojure mid-project?
15:22	sritchie	fliebel: they've finished a first version of the project, that works with EC2, but it's quite fragile
15:22	sritchie	http://www.cgdev.org/section/initiatives/_active/forestmonitoringforactionforma
15:23	sritchie	fliebel: it's working with 1000m data -- nasa provides 500m and 250m, which will be far better, but the current system doesn't scale
15:23	sritchie	I'm redoing it in clojure, with hadoop -- it's probably going to clock in at 10% of the code, something like that
15:23	sritchie	what with shedding the file IO, etc
15:26	fliebel	sritchie: Very good work!
15:27	sritchie	fliebel: it's been really fun
15:30	arohner	is there a "drop-nth" function anywhere, or do I need to write it? i.e. returns a seq with the nth item missing
15:30	fliebel	sritchie: Do you also monitor forest growth? It would be interesting to compare.
15:30	sritchie	that's really interesting, I'm sure it would be
15:30	fliebel	(mapcat (partition 4))
15:30	sritchie	we don't do that now
15:31	sritchie	but with clojure, everything becomes far more composable
15:31	sritchie	so we can play with different methods of analyses, or pull in new datasets with little effort
15:31	doubleagent	What is wrong here? https://gist.github.com/812758
15:32	markskilbeck	I'm trying to generate a vector, x * y in length, of random numbers, though I don't know much (if any) Clojure. Any hints? Preferably not code.
15:33	doubleagent	oops
15:33	fliebel	sritchie: Great! Saying "Xkm^2 of deforestation" is not very meaningful without knowing how much new forest there is. ;)
15:33	markskilbeck	doubleagent: at a glance, I'd say its existence, or lack thereof, is the issue.
15:33	markskilbeck	;)
15:33	sritchie	we're tracking the percent probability that a given square kilometer of forest has been deforested, and projecting that forward in time
15:34	Chousuke	markskilbeck: into, rand-int, take and repeatedly :P
15:34	sritchie	fliebel: but you're right!
15:34	markskilbeck	Chousuke: thank you, sir!
15:35	doubleagent	markskilbeck, lol. specifying the context should provide it. Just wanted to know if this is a Cake bug or what?
15:35	fliebel	Chousuke: into?
15:36	Chousuke	fliebel: for the vector.
15:36	Chousuke	fliebel: but I guess vec works too
15:36	fliebel	right
15:37	fliebel	Chousuke: Another thing to consider is, if he does not know Clojure very well, does he really want a vector.
15:37	markskilbeck	I'm right here, guys.
15:37	fliebel	markskilbeck: How is it going?
15:38	markskilbeck	fliebel: uno momento.
15:42	markskilbeck	,(repeatedly 16 #(rand-int 10))
15:42	clojurebot	(8 6 6 8 8 4 6 7 3 4 ...)
15:42	markskilbeck	Is that along the right lines?
15:42	Chousuke	yes.
15:42	markskilbeck	Badassery.
15:42	Chousuke	actually I forgot repeatedly takes a count argument too :)
15:42	markskilbeck	It being a vector isn't important, I don't think.
15:42	doubleagent	sorry about that - here's the issue: https://gist.github.com/812768
15:43	markskilbeck	When should one user a vector, when should one use a list, etc.?
15:43	Chousuke	use seqs whenever you can
15:43	Chousuke	if you need random access, use vectors
15:44	Chousuke	vectors are also good for literals wherever you need a seq
15:44	markskilbeck	Chousuke: could you elaborate on that last statement?
15:45	Chousuke	most functions that want a seq actually call the seq function on the argument
15:45	Chousuke	so you can pass a vector instead and it works
15:46	markskilbeck	Ah, I see.
15:46	Chousuke	ie. you can just call (foo [1 2 3]) instead of (foo (list 1 2 3)) or something.
15:46	markskilbeck	Jolly good.
15:47	LauJensen	hiredman: Looks like you got caught with your hand in the cookie jar :(( http://www.youtube.com/watch?v=oJagxe-Gvpw
15:49	danlarkin	that's not very nice Lau
15:49	LauJensen	danlarkin: I didnt record it, its some security guy who put up honeypots
15:49	LauJensen	(promise)
15:49	doubleagent	solved it - it wasn't pulled into the namespace
15:50	danlarkin	oh, honeypotting is fine, but insulting hiredman is rude
15:50	LauJensen	danlarkin: hehe, thats funny you should say so
15:50	fliebel	ghe, is hiredman a haxor who runs perl all the time on windows SP3?
15:50	doubleagent	ninjudd, there's an error in your documentation
15:52	fliebel	LauJensen: Why is that funny?
15:53	LauJensen	fliebel: I think its fairly common knowledge that hiredman is one of the most rude and insulting personalities in the land of clojure, so objecting to having some fun with him is at best funny, at worst hypocritical
15:55	fliebel	… I never noticed that.
15:55	markskilbeck	Man I love the song on that video.
15:56	LauJensen	markskilbeck: yea its great
15:59	fliebel	http://xkcd.com/481/
16:01	markskilbeck	Thankfully no one is around to hear me singing falsetto ^-^
16:01	LauJensen	fliebel: haha, that would be great
16:01	LauJensen	markskilbeck: haha
16:01	fliebel	http://freetts.sourceforge.net/docs/index.php + sexpbot :)
16:03	jaskirat	fliebel: that would be fun! :)
16:04	fliebel	jaskirat: One would need to couple it with an upload service… but it's an interesting idea...
16:06	jaskirat	fliebel: hmm, soundcloud.com?
16:08	fliebel	jaskirat: http://code.google.com/p/soundcloudapi-java/
16:11	fliebel	I'm all for it! $speak nickname -> soundcloud link of last message :D
16:13	jaskirat	fliebel: soundcloud + emms
16:13	jaskirat	fliebel: http://www.emacswiki.org/cgi-bin/wiki/EMMS
16:13	jaskirat	fliebel: never used emms though.. hmm
16:15	fliebel	time to go
16:15	fliebel	bye
16:25	shortlord	how can I evaluate a form in a macro? I am passing 2 forms, the first should be evaluated to decide whether to execute the second form or not
16:26	Chousuke	why not just generate an if expression? :/
16:29	Chousuke	if you want a conditional expansion you can use eval but be aware that it's limited
16:29	shortlord	Chousuke: doh, of course! thx a lot, it works now
16:29	sritchie	hey all -- if i have something like this --
16:29	sritchie	,((juxt #(* 2 %) #(vector 2 %)) 3)
16:29	clojurebot	[6 [2 3]]
16:29	sritchie	ie, one function that returns a number, one that returns a collection,
16:29	shortlord	Chousuke: I still have quite a few problems to think of macros purely in terms of code transformation
16:29	jassi	shortlord: some thing like (defmacro x [f1 f2] `(if (f1)(f2)))
16:29	jassi
16:29	Chousuke	shortlord: yeah, macros don't really "execute" code.
16:30	sritchie	what's the best way to end up with a list of all of the numbers, merged?
16:30	Chousuke	shortlord: they just generate it and the result is what gets run at runtime.
16:30	sritchie	to cons or merge them all, and end up with a list one deep
16:30	shortlord	sritchie: what do you mean, 'merged'? you can use 'flatten' to put all the elements into one big list
16:30	jassi	shortlord: oops that should be ~f1 & ~f2
16:31	sritchie	shortlord: flatten sounds right
16:32	shortlord	Chousuke: yeah, macros definitely are a fascinating topic. I really need to get a bit more practice with them
16:33	Chousuke	shortlord: honestly the trickiest thing about macros is knowing when to use them :)
16:35	shortlord	Chousuke: that's what I am still figuring out. So far I have been using them as little as possible, preferring functions wherever possible and just using them in cases like this where the arguments must not be evaluated
16:38	Chousuke	shortlord: that's a good rule of thumb :P
16:38	shortlord	hah, nice :D
16:39	jaskirat`	whats the best way to look up documentation for clojure functions while inside the repl? i thought the :doc would be the best way but doesnt seem to work. like python has help() or __doc__, something like that?
16:40	kjeldahl	,(doc vec)
16:40	clojurebot	"([coll]); Creates a new vector containing the contents of coll."
16:40	shortlord	jaskirat`: doc should work, simply do (doc some-name)
16:40	jaskirat`	thanks guys
16:40	jaskirat`	i was trying (:doc blah)
16:41	amac	you can also use (source some-name) if you need more information
16:41	amac	will show you the implementation
16:42	jaskirat`	amac: hmm, that should be usefull sometimes
16:43	amac	jaskirat`: if you wanted to learn more about macros, source some macros for inspiration :)
16:44	jaskirat`	amac: :)
20:52	hiredman	https://github.com/ztellman/lamina/blob/master/src/lamina/core/fn.clj#L17 well that looks familiar
21:36	sritchie	hey all -- is it possible to define an array of unsigned integers in java?
21:37	brehaut	sritchie: if there are unsigned integer primatives (i dont think there are) then yes, otherwise no?
21:37	sritchie	brehaut: I didn't think there were unsigned int primitives, just wanted to check if anyone had had to deal with that issue
21:38	brehaut	people must have dealt with it in javaland at least
21:38	sritchie	the goal is to get out of javaland as fast as possible!
21:39	sritchie	brehaut: in any case, problem avoided, the REPL tells me this method will read into a java primitive byte array
21:39	sritchie	progress!
21:52	sritchie	when did clojure start supporting doc strings on def?
21:53	sritchie	I'm using leiningen, with 1.2, and still getting "Too many arguments to def"
22:04	mreynolds	sritchie: You may be interested to know that Java bytes are also signed http://www.jguru.com/faq/view.jsp?EID=13647
22:04	mreynolds	I think it's a bytecode thing. Anyway, if you have something that works, awesome.
22:06	sritchie	mreynolds: no, that's helpful. I'm interacting with a java object, a dataset, that needs to take an array and read into it -- it takes an optional parameter for datatype, and I know that the source data is either an unsigned byte, signed int (16 bits) or unsigned int
22:07	sritchie	the default, with that parameter left out, is an array of 32 bit ints
22:07	sritchie	which makes sense, given that we're talking about a java API
22:08	mreynolds	sritchie: I have strong memories of Java only having signed types, primarily because of the simplicity of dealing with fewer types at the bytecode level, but don't hold me to that. Are you just passing the data through, or are you trying to deal with it in clojure/java?
22:09	sritchie	the ReadRaster method on this object takes that int array and a few other things, and fills it with ints -- then I'm creating a lazy seq with (indexed (partition chunk-size array))
22:09	sritchie	which serializes the data back out into hadoop-land
22:53	sritchie	has anyone had trouble with a docstring on def?
22:53	sritchie	defn works great, of course, but def won't accept one -- i get a "too many arguments to def" error