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00:26 SamB_MacG5: yoklov: often, yes
00:27 yoklov: yeah.
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01:18 victerra: Hi I was wondering if one of you could help me with a programming issue... I am trying add up two vectors and I am not sure which direction I should take
01:18 victerra: Im pretty sure I should be doing (define-struct vec3 (x y z))
01:18 mithos28: victerra: What do you mean by add up two vectors?
01:19 victerra: as in I have a vector (x1 y1 z1) and vector2 (x2 y2 z2) and I need to create a program that makes a vector3 of (x1+x2, y1+y2, z1+z2)
01:20 mithos28: well then, yes your first idea is good
01:20 victerra: Im not sure where to go from there
01:21 mithos28: have you taken a look at match?
01:21 victerra: No what is that?
01:21 mithos28: rudybot: doc match
01:21 rudybot: mithos28: your sandbox is ready
01:21 rudybot: mithos28: http://docs.racket-lang.org/reference/match.html#(form._((lib._racket%2Fmatch..rkt)._match))
01:22 mithos28: rudybot: (define-struct vec3 (x y z))
01:22 rudybot: mithos28: Done.
01:22 victerra: ahhh
01:22 victerra: thank you
01:22 mithos28: rudybot: (match (vec3 1 2 3) ((vec3 x y z) (+ x y)))
01:22 rudybot: mithos28: ; Value: 3
01:23 mithos28: There is also match* which would let you match on two values
01:23 mithos28: rudybot: (match* ((vec3 1 2 3) (vec3 4 5 6)) (((vec3 x1 y1 z1) v2) x1)))
01:23 rudybot: mithos28: accordingly to docs, (vector-set! vec pos v) → void?
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01:24 mithos28: rudybot: (match* ((vec3 1 2 3) (vec3 4 5 6)) (((vec3 x1 y1 z1) v2) x1))
01:24 rudybot: mithos28: ; Value: 1
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01:41 victerra: another issue, when I type in the match function I am getting this error message "vec3: expected a function after the open parenthesis, but found a structure name". I've ran my define-struct so Im confused as why im getting this
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02:49 neilv: so. if i want to draw a splash-screen-like display of text that scales an arbitrarily-large size screen... maybe instead of getting the screen size and setting font sizes based on that, i instead just do my positioning and bounding arithmetic with fixed-size fonts, and then set set-scale to fit the display
02:50 neilv: normally, you'd want to change the font size instead, since some font systems scale fonts more intelligently than just increasing their sizes
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03:43 Pip: Hi, is racket a typical AI language?
03:43 mithos28: What do you mean by that?
03:43 Pip: Used for AI research
03:44 mithos28: I don't know of any AI research using racket
03:44 Pip: Since Lisp was created for AI
03:44 mithos28: Most of the people working on racket do PL research
03:44 Pip: So what do you guys do with Racket?
03:44 Pip: What is PL?
03:44 mithos28: Programming languages
03:44 Pip: oh
03:48 mrcarrot: I wonder if Lisp is at all a major player in AI research anymore...
03:49 Pip: It's NOT, but Java is
03:49 mithos28: Java is one of the standard incumebent languages now
03:50 mrcarrot: Nowadays (at least when you look at the names of university courses) neural networks seems to be a hot topic. And those can be implemented in any langauge.
03:51 neilv: for statistical methods, you need to crunch numbers fast
03:51 mrcarrot: Functional programming is still going strong, even though it is more through the backdoor.
03:53 mrcarrot: Features from FP are creeping into mainstream programming languages. This is one of the biggest reason to learn a FP language, as it will make you more efficient with almost any other language.
03:54 mrcarrot: And of course, less risk of bugs :) (Bugs will still exist)
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07:23 Cryovat: http://www.nasa.gov/multimedia/nasatv/index.html#hn
07:23 Cryovat: It's beautiful :)
07:24 Cryovat: SpaceX has restored a big piece of my hope for the future
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08:53 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/atlf0w
08:53 RacketCommitBot: [racket/master] Scribble: add some macron accents for Latex - Matthew Flatt
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09:14 RacketCommitBot: [racket/master] Scribble Latex: more complete and consistent handling of accented letters - Matthew Flatt
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09:49 SamB_MacG5: mrcarrot: of course bugs will still exist; even if the program is exactly what it's intended to be, the spec might be wrong ;-P
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09:51 SamB_MacG5 wishes someone would review https://github.com/plt/racket/pull/148 ...
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09:52 SamB_MacG5: eli: someone said something about asking you to look at it?
09:52 ianjneu: Scribble is largely mflatt with some samth and eli, I think. Sam is currently preparing for RacketCon this weekend, and probably Matthew.
09:53 ianjneu: I could be wrong about eli.
09:56 eli: SamB_MacG5: Almost all of that is my stuff, so it will take me some time to go over it.
09:57 eli: On a quick look there are some things that I'm not sure about.
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09:58 eli: SamB_MacG5: Also, it would be best to just mail me about it, and feel free to bug me again if I didn't get to do anything (which is very likely...) -- eli@barzilay.org
09:59 eli: m4burns: email is better these days...
10:00 SamB_MacG5: eli: which things are you not sure about?
10:00 samth: ianjneu: i have nothing to do w/ the scribble implementation
10:00 samth: i just use it
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10:07 SamB_MacG5: whoa, datalog even *looks* like prolog!
10:07 SamB_MacG5: seems a bit short on docs, though ...
10:07 ianjneu: samth: good to know. How many scriblibs did you write?
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10:11 SamB_MacG5: hmm, entering that email address into firefox gets me eli's website and a warning dialog on every page load...
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10:11 eli: SamB_MacG5: I don't remember, and I can't allocate cycles for it today...
10:11 eli: Also, what warning?
10:12 SamB_MacG5: eli: something about logging in as "eli" ;-)
10:13 eli: That would be a weird warning then...
10:14 SamB_MacG5: well, it just assumed I wanted to go to http://eli@barzilay.org
10:14 samth: ianjneu: i patched the bibliography one a couple times
10:15 eli: SamB_MacG5: Ah.
10:16 eli: SamB_MacG5: BTW, it would be easier if I'll take your changes on a per-commit basis since some of them are kind of obvious.  Would you mind that?
10:16 SamB_MacG5: that's fine
10:16 eli: You could then do a rebase against the tip and the ones I merged would disappear.
10:17 SamB_MacG5: yeah
10:18 SamB_MacG5: I'm guessing you were going to effectively rebase them anyway?
10:18 eli: Yes, we do indeed rebase things instead of merging.
10:19 SamB_MacG5: (That would also make it quite clear which ones you're less sure about ;-)
10:19 eli: And in this case I'd be kind of cherry-picking.
10:19 eli: No -- it would just show what I can deal with fast and delay the ones that require more work...
10:19 SamB_MacG5: one downside of rabasing/cherry-picking is that github doesn't notice when you do that, of course
10:20 SamB_MacG5: eli: well, okay, clear*er*?
10:22 SamB_MacG5 posted a comment about cherry-picking being fine
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10:28 eli: SamB_MacG5: Yeah, I know -- their workflow makes a little more sense for "very distributed" work, where instead of a single repo each person work on their own fork.
10:31 SamB_MacG5: eli: hmm, I don't see how syncing more frequently makes merging suddenly not useful ...
10:31 SamB_MacG5: less useful, I guess, though
10:32 eli: It's not the syncing frequency that is an issue...  It's just a workflow decision.
10:33 eli: And the decision that GH made was to use explicit merge commits to mark points of merges -- even if the merges are no-ops.
10:34 eli: For example, once some change had been rebased into our tree, GH still shows the pull request as merge-able even though the changes are included
10:35 eli: When I asked about that, they clarified that such a merge would do nothing, but it *is* possible to merge it (trivially) and they like that for how their pull request workflow goes.
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10:48 eli: SamB_MacG5: What's the reason for "Write doc PDF to <dir>" -> "Enable doc PDF to <dir>"?  (The first looks more readable.)
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10:58 SamB_MacG5: eli: well, it wasn't clear to me that it enabled the feature
10:59 SamB_MacG5: possibly we should just write up all of the options for the scribble docs ...
11:00 SamB_MacG5 has to go now, will be back in a few hours
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11:05 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/eKZ5wA
11:05 RacketCommitBot: [racket/master] Misc improvements to the doc search JavaScript code - Samuel Bronson
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11:06 eli: SamB_MacG5: How about "Enable and [same]"?
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11:07 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/C0_lYA
11:07 RacketCommitBot: [racket/master] Fix a couple of doc typos. - Samuel Bronson
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11:08 eli: SamB_MacG5: And with that, the things that are left are:
11:08 eli: - Improve help for "raco setup"'s "--doc-pdf" flag.
11:08 eli: - Add "install-html" and "install-pdf" targets to Makefile.
11:08 eli: - Hack to keep search.js and search-context.html up-to-date in doc/ trees
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11:26 stamourv: eli: ping
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11:34 eli: stamourv: ?
11:35 stamourv: Are you in your office? I have questions about the profiler.
11:36 eli: Give me a minute.5
11:36 stamourv: Ok. Say when.
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11:44 RacketCommitBot: [racket] plt pushed 2 new commits to master: http://git.io/7nLJVQ
11:44 RacketCommitBot: [racket/master] fix some part of the check syntax blinking arrows infrastructure - Robby Findler
11:44 RacketCommitBot: [racket/master] rename 'online' to 'speculative' in the drracket GUI. - Robby Findler
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13:23 danl-ndi: samth: I just found out about RacketCon...  I'd love to attend.  last minute flights are kinda ridiculous, though....
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13:45 mizu_no_oto: Can you get something like haskell's typeclasses in Racket?
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13:46 stamourv: mizu_no_oto: Racket's new generics cover similar use cases.
13:46 stamourv: rudybot: doc define-generics
13:46 rudybot: stamourv: your sandbox is ready
13:46 rudybot: stamourv: no docs for a current binding, but provided by: unstable/generics
13:46 stamourv: Oh, rudybot is still using an old version. Generics are new in 5.3.
13:47 stamourv: mizu_no_oto: http://docs.racket-lang.org/reference/struct-generics.html?q=define-generics#%28form._%28%28lib._racket/generic..rkt%29._define-generics%29%29
13:47 rudybot: http://tinyurl.com/8zdmyg7
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13:51 mizu_no_oto: Can you extend an existing type via generics?  I.e. implement a monoid on lists without having a make-list-monoid function to wrap it in a struct?
13:52 stamourv: mizu_no_oto: Not in the current version, no.
13:52 stamourv: But, we have a new version that allows it that's currently in code review. It should be in a future release.
13:53 mizu_no_oto: Sounds awesome
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13:53 stamourv: In the meantime, there's a pattern you can use:
13:53 stamourv: `define-generic' creates definitions for the generic functions you specify.
13:54 mizu_no_oto: I'm not really coding much racket now, more just taking a look at it.  So the fact that it will be in a future version is good enough.
13:54 stamourv: But instead of exporting, say, the `foo' generic function directly, you create `my-foo', which checks for lists, handles them specially, but otherwise calls `foo'.
13:54 stamourv: Then, you export `my-foo' as `foo', and no-one knows.
13:55 stamourv: mizu_no_oto: Generics are being actively developed. They're already pretty useful, but we're still improving them.
13:56 mizu_no_oto: How well do they work with typed racket?
13:57 mizu_no_oto: rather, how well will they work
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13:57 stamourv: Not very well yet. But some of the work being done on types for Racket's object system should help.
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17:07 samth: danl-ndi: too bad -- we'd love to have you here
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18:08 SamB_MacG5: eli: thanks for merging :-)
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18:54 victerra: hey guys can one of you guys help me with a problem
18:55 m4burns: victerra: what's up?
18:55 victerra: I have (define-struct vector3 (x y z))
18:55 victerra: I am trying to write a program that takes two vectors V1 (x y z) and V2 (a b c) and adds them to create V3 ((x+a),(y+b),(z+c))
18:55 victerra: but am not sure where to go from there
18:56 m4burns: victerra: do you know how to access the x, y, and z components of a vector?
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18:57 victerra: no those are simply variables
18:58 m4burns: suppose i provide you with a vector3 named 'a'. can you write an expression which evaluates to the x value of a?
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19:05 jonrafkind: how come local-expand isn't expanding my syntax
19:05 jonrafkind: i have one thing in the stop list
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19:18 jonrafkind: I cant get local-expand to expand sub-expressions.. do I need to do that manually?
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20:47 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/e9HIxw
20:47 RacketCommitBot: [racket/master] preserve the error-print-source parameter when installing planet packages - Robby Findler
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21:06 carleastlund: jonrafkind, if you have anything in the stop list it's not going to expand subexpressions.  See the docs, it says if the stop list is non-null it adds all the identifiers for fully-expanded syntax.
21:09 asumu: carleastlund: BTW, can you explain why the free-identifier=? check in generics is wrong?
21:10 asumu: (I don't doubt you, but I just don't understand the subtleties)
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21:41 (nick) jao -> geiserbot`
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23:42 SamB_MacG5 wonders why scribble has to render stuff twice
23:42 SamB_MacG5: it's not like it has to find a pagination fixpoint or anything
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