#clojure – 2017-06-29

2017-06-29

00:12	random_numbers	https://github.com/enragedginger/tensorflow-clj Any opinion on this wrapper?
00:23	TEttinger	random_numbers: if it hasn't hit Hacker News yet, get ready
00:24	random_numbers	Oh?
00:24	TEttinger	just guessing baseed on machine learning, immutable functional programming, and hacker news
00:27	random_numbers	Fair point.
01:19	kenrestivo	i think it's been around a while
01:20	kenrestivo	says alpha api tho
04:52	Hanonim	Yop
07:05	dysfun	hi
07:18	Rovanion	Hello
07:37	BigSafari	Trying to convert a string to ISO-8859-1 and use it as body in an email im sending using Postal. Any hint to how to convert from standard Clj string to ISO-8859-1?
07:39	dysfun	(.encode (Charset/forName "ISO-8859-1") my-string)
07:44	BigSafari	Thanks!
07:45	dysfun	that's java.nio.charset.Charset btw
07:47	BigSafari	Yes, found it :-)
07:51	BigSafari	encode seems to return a java.nio.HeapByteBuffer but i need it as a string to be able to send it with Postal. But is that even possible?
07:53	dysfun	oh, then postal must handle the encoding
07:53	dysfun	java strings are strings of logical characters
07:53	BigSafari	yes, will look further into Postal for a solution.
08:25	Hanonim	here is a silly request : is there something akin to a plotting clj lib for the terminal ?
08:30	xemdetia	ascii art?
08:30	Hanonim	probably
08:38	osfabibisi	sadly looks like JavE never quite got open-sourced http://www.jave.de/developer/index.html
08:40	Hanonim	too bad, looks cool
08:44	dysfun	i expect if you email, you might get a copy
08:45	osfabibisi	yeah, very likely. Markus seemed like a nice guy when I used to hassle him about JavE bugs and features ;-)
08:45	dysfun	risk you might get asked to maintain it though ;)
08:52	osfabibisi	hehe yeah
08:52	osfabibisi	every now and then I think I might want to write an ascii art toolkit
08:53	osfabibisi	I've got a couple of Perl modules that do bits and bobs including https://metacpan.org/release/Text-JavE to read JavE output ;-)
09:05	fu86	hi
09:05	dysfun	hello
09:05	fu86	I have a map with the structure {"a" "b" "c" "d"} and I want to make it like this: {:a "b" :c "d"}
09:06	fu86	Is there a clever way to do this besides map/keyword/interleave/ ...
09:06	dysfun	,(into {} (map (juxt keyword identity)) {"a" "b" "c" "d"})
09:06	clojurebot	{nil ["c" "d"]}
09:07	dysfun	hrm
09:07	justin_smith	,(into {} (map (fn [[k v]] [(keyword k) v])) {"a" "b" "c" "d"})
09:07	clojurebot	{:a "b", :c "d"}
09:07	dysfun	yes, that was my first version and then i rewrote it
09:07	dysfun	but it still hasn't clicked why it didn't work
09:07	fu86	:) looks good
09:08	dysfun	what's my bug justin_smith ?
09:08	justin_smith	dysfun: juxt uses the same arg twice, you want to use the first and second elements in the arg separately
09:08	dysfun	oh yeah
09:08	dysfun	thanks
09:09	justin_smith	(partial map #(% %2) [keyword identity])
09:09	dysfun	yeah, but then it's not convenient heh
09:09	justin_smith	,(into {} (partial map #(% %2) [keyword identity]) {"a" "b" "c" "d"})
09:09	clojurebot	#error {\n :cause "clojure.lang.LazySeq cannot be cast to clojure.lang.IFn"\n :via\n [{:type java.lang.ClassCastException\n :message "clojure.lang.LazySeq cannot be cast to clojure.lang.IFn"\n :at [clojure.core.protocols$iter_reduce invokeStatic "protocols.clj" 49]}]\n :trace\n [[clojure.core.protocols$iter_reduce invokeStatic "protocols.clj" 49]\n [clojure.core.protocols$fn__9124 invokeStati...
09:09	justin_smith	err
09:09	ridcully_	(transform [MAP-KEYS] keyword {"a" "b"}) ; specter
09:09	justin_smith	,(into {} (map (partial map #(% %2) [keyword identity])) {"a" "b" "c" "d"})
09:09	clojurebot	#error {\n :cause "clojure.lang.Keyword cannot be cast to java.util.Map$Entry"\n :via\n [{:type java.lang.ClassCastException\n :message "clojure.lang.Keyword cannot be cast to java.util.Map$Entry"\n :at [clojure.lang.ATransientMap conj "ATransientMap.java" 44]}]\n :trace\n [[clojure.lang.ATransientMap conj "ATransientMap.java" 44]\n [clojure.lang.ATransientMap conj "ATransientMap.java" 17]\n ...
09:10	dysfun	yeah, just use specter
09:10	justin_smith	,(into {} (map (partial mapv #(% %2) [keyword identity])) {"a" "b" "c" "d"}) ; sorry about the false starts
09:10	clojurebot	{:a "b", :c "d"}
09:12	fu86	didn't know specter. Is this a thing everybody uses? (like jquery for webdev?)
09:13	ridcully_	,{(keyword "a :b") "c"} ; also be aware of the keyword-all-the-things pitfalls
09:13	clojurebot	{:a :b "c"}
09:13	ridcully_	my impression from the lack of questions here is, that it's not widely used
09:14	ridcully_	on the other hand it has some solid amount of GH stars for a clj lib
09:14	ridcully_	so maybe all are just happy and dont have any questions about it
09:14	fu86	:)
14:55	michaelrose	I'm wondering why by default the popup buffer that is generated by say cider grimiore isn't syntax highlighted. its not really hard to make it run clojure-mode on creation and bind q to quit but it seems rather obvious
14:58	michaelrose	oh actually maybe the sections labeled ```clojure are supposed to be highlighted
15:01	random_numbers	Found a bug?
15:07	michaelrose	random_numbers, its not highlighted didn't think it was by default is it supposed to be?
15:09	random_numbers	I've yet to install/setup grimoire so I don't know.
15:09	michaelrose	its part of cider
15:10	random_numbers	Part of the core?
15:10	random_numbers	I really should read the manual...
15:11	michaelrose	wanna run cider-grimoire and see if its highlighted?
15:15	random_numbers	Hm... I seem to not be able to resolve anything. Guess my config's borken.
15:16	random_numbers	alright, now that works.
15:17	random_numbers	That rightly should be highlighted and isn't.
15:17	michaelrose	my mode is fundamenta
15:18	michaelrose	fundamental
15:18	random_numbers	Me too.
15:18	michaelrose	but the ```cider ``` sections are syntax highlighted?
15:19	random_numbers	Nope.
15:19	michaelrose	ah that is what I meant
15:20	random_numbers	Mhm, it should be highlighting but doesn't. Thing is that'd depend on a markdown mode which would require highlight info for clojure.
15:20	random_numbers	I remember having issues compiling a couple manuals locally because debian-stable didn't distribute the version with those additions.
16:24	xemdetia	make sure you check messages
17:17	technomancy	this codebase has a lot of uses of -> where they make sure that the first argument is just a straight variable
17:18	technomancy	whereas I almost always make my first function call in the first position of ->
17:20	TimMc	I've seen idiomatic cases of both.
17:20	TimMc	(def idiomatic? tim-approves?)
17:21	technomancy	I just need to keep resisting the urge to "clean it up" to my style
17:22	TimMc	technomancy: Some people prefer to buy paint and then paint their bikeshed, whereas others prefer to paint their bikeshed with paint they've bought.
17:22	technomancy	I am also seeing a predicate function which instead of returning a boolean, throws an exception to indicate false-ness
17:23	TimMc	uh-oh
17:23	TimMc	~guards
17:23	clojurebot	SEIZE HIM!
17:23	osfameron	!
17:24	random_numbers	technomancy: Now that's not idiomatic.
17:24	dysfun	it's arguably not a predicate
17:24	technomancy	the docstring even says that's how it's supposed to work
17:24	jeaye	It only ever returns true. :)
17:24	technomancy	but I have to fix real bugs first
17:27	TimMc	Is Acme, by any chance, a collection of silly stuff?
17:27	dysfun	it is, how did you guess?
17:28	dysfun	other acme modules include Acme::Octarine (which does evil evil evil stuff to modify a colours module to add Octarine)
17:29	dysfun	https://metacpan.org/pod/Acme::EyeDrops and Acme::EyeDrops is perhaps infamous
17:30	technomancy	oh dear
17:34	random_numbers	heh
20:44	osfameron	can you generate repeatable random numbers?
20:44	osfameron	e.g. with a seed?
20:45	justin_smith	yes, via java.util.Random or gfredericks's library that wraps it
20:45	justin_smith	https://github.com/gfredericks/four
20:47	osfameron	ta
20:48	justin_smith	if you look at thecode using interop - it's probably easier to just use the java stuff instead of his lib, unless you want the stateless thing https://github.com/gfredericks/four/blob/master/src/four/stateful.clj
20:52	osfameron	yeah, that looks very much like Haskell's API for random
20:53	justin_smith	that's no coincidence
22:46	TEttinger	osfameron: in Java 8 and higher, SplittableRandom is good (much better than java.util.Random in many ways)
22:47	TEttinger	higher period, a large amount of different number streams can be produced from one seed (usually one per thread), better quality AND speed
22:47	TEttinger	it's also in java.utl IIRC
23:02	TEttinger	osfameron: the core of SplittableRandom is pretty shockingly simple. it's pretty much this function, if you call it with a parameter that is incremented by an odd number.
23:02	TEttinger	public static long splitMix64(long z) { z = (z ^ (z >>> 30)) * 0xBF58476D1CE4E5B9L; z = (z ^ (z >>> 27)) * 0x94D049BB133111EBL; return z ^ (z >>> 31); }
23:02	kenrestivo	SpitballRandom
23:03	TEttinger	so calling splitMix64(state += 1337) would work if you did that every time on one thread, and splitMix64(state += 421) on another thread
23:03	TEttinger	this is of course not as convenient in clojure since it needs mutation
23:03	TEttinger	also a ton of bit twiddling
23:04	TEttinger	also those longs are both negative
23:04	TEttinger	,0xBF58476D1CE4E5B9
23:04	clojurebot	13787848793156543929N
23:04	TEttinger	,(unchecked-long 0xBF58476D1CE4E5B9)
23:04	clojurebot	-4658895280553007687
23:57	random_numbers	It's not cryptographically secure anyway, is it?