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11:27 PLT_Notify: racket: master Eli Barzilay * 52ca08a (1 files in 1 dirs): * scheme -> racket ...
11:27 PLT_Notify: racket: master Eli Barzilay * f867fea (3 files in 3 dirs): Prebuilt link in the all versions page, other minor fixes.
11:27 PLT_Notify: racket: master commits 717a618...f867fea - http://bit.ly/eSkWfQ
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12:04 PLT_Notify: racket: master Ryan Culpepper * ccc70fc (16 files in 6 dirs): removed unused modules and code from unstable
12:04 PLT_Notify: racket: master Ryan Culpepper * 459cce2 (5 files in 5 dirs): moved contents of unstable/set to racket/set
12:04 PLT_Notify: racket: master Ryan Culpepper * 033e060 (1 files in 1 dirs): removed unstable/sexp-diff
12:04 PLT_Notify: racket: master Ryan Culpepper * c0bd4e8 (3 files in 3 dirs): removed unused code from unstable/hash
12:04 PLT_Notify: racket: master commits f867fea...c0bd4e8 - http://bit.ly/hf3nCM
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12:16 mattmight: Uh, I was using unstable/sexp-diff for grading.
12:16 mattmight: Oops.
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12:17 _ryanc_: mattmight, I've asked stamourv to turn it into a planet package
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12:21 jonrafkind: you could probably leave unstable/sexp-diff for at least another version until people completely move over to the planet package
12:23 mattmight: Oh, good.
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12:48 cousin: hello?
12:48 jonrafkind: hello
12:50 cousin: Hi! My issue is kind of complicated so I might take a minute to fully describe it
12:50 cousin: We are given a function (count) which as called willl return
12:51 cousin: (count) 0; (count) 1 ; (count) 2 ; (count) 3 ; (count) 0
12:51 cousin: and then it repeats
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12:52 cousin: With this, we are supposed to assign the function (make-count) to separate variables which will return independent (count)s
12:53 cousin: as in if I (define a (make-count)) and (define b (make-count)) it will look like:
12:53 cousin: > a
12:53 cousin: 0
12:53 cousin: > a
12:53 cousin: 1
12:53 cousin: > b
12:53 cousin: 0
12:53 cousin: and so on
12:54 cousin: That's it, that's my problem. I have tried some things but everything I try either returns #<procedure> or some single number. Can you help me?
12:56 cousin: Here is the (count) function
12:58 jonrafkind: is this homework?
12:58 askhader: Ooh this problem is fun
13:00 cousin: Yes it is homework. Can you help me? btw something's wrong with paste.lisp.org so I don't know how I'm going to get my code out here
13:00 cousin: http://paste.lisp.org/+2LOZ
13:00 jonrafkind: rudybot: (define foo (let ([x 5]) (lambda () x)))
13:00 rudybot: jonrafkind: your sandbox is ready
13:00 rudybot: jonrafkind: Done.
13:00 jonrafkind: rudybot: (foo)
13:00 rudybot: jonrafkind: ; Value: 5
13:01 jonrafkind: thats the limit of hints ill give you
13:01 cousin: Okay I'll see what I can do with that.
13:01 jonrafkind: anyway, my random question of the day is why srfi's don't have names. like srfi/stream instead of srfi/41
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13:07 bremner: jonrafkind: it would be one more thing to fight about
13:07 jonrafkind: ill be sure to use this same logic when naming my children
13:07 jonrafkind: fred? jerry? fff, lets just go with 24
13:08 bremner: well, if you happen to be married to 100 academics, then yes, go with 24
13:11 samth: bremner, :)
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14:33 PLT_Notify: racket: master Sam Tobin-Hochstadt * f9bf318 (1 files in 1 dirs): Fix `ormap' error messages in HTDP languages. - http://bit.ly/er70CT
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15:58 PLT_Notify: racket: master Matthew Flatt * 00ca86f (1 files in 1 dirs): `xref-binding->definition-tag': fix two-argument-list mode ... - http://bit.ly/gFsg3B
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15:59 PLT_Notify: racket: master Jay McCarthy * 9c19571 (3 files in 3 dirs): Responding to Norman's request - http://bit.ly/eNjWqf
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17:07 mye: anyone has a hunch how to wait until a servlet is ready to accept requests? (programmatically of course, I know how to wait manually all too well :-) )
17:08 jonrafkind: can't you just detect if the port is open?
17:09 mye: ok, thats an idea. I thought maybe there is some signalling mechanism.
17:09 jonrafkind: theres probably a better way but im not really familiar with the racket webserver / servlets
17:12 mye: It's a bit annoying for incremental development, after restarting the servlet if I hit refresh in the browser too soon it will sometimes even timeout...
17:13 jonrafkind: isnt there some option in the start method that automatically opens a browser window?
17:14 mye: jep, maybe I'll reenable that.
17:14 mye: but then I'll have to close all the tabs manually ^^
17:22 mye: and it takes about ten seconds to start up, maybe emacs/SLIME, e.g. push some code into a long running racket process (the servlet) can help, but I have no idea if that is supported!?!
17:24 jonrafkind: 10 seconds seems like a long time, what is the servlet doing?
17:25 jonrafkind: have you tried raco make ?
17:30 mye: it has two macros, a couple functions, I suspect the whole compilation process and the web stack just take that long, but disk and cpu caches should do their job right?
17:32 jonrafkind: so you have one file that is like <300 lines of code and it takes 10 seconds to start up?
17:35 mye: well its on windows, but, yeah
17:35 jonrafkind: something sounds strange
17:36 mye: It should just recompile the one file and restart the webserver and load the compiled servlet
17:37 mye: but I can easily count to 9
17:38 jonrafkind: can you post your code? maybe I can try it
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17:39 mye: yes, btw I'm currently using a nightly but it has never been a speed demon
17:40 jonrafkind: i have a build from like 2 days ago
17:41 mye: jonrafkind: http://codepad.org/V6X5FLse
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17:43 jonrafkind: theres two bullet points, one says 'not there yet' and another shows /, is that right?
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17:43 mye: yes
17:44 jonrafkind: it starts up in about 1 second for me, on linux
17:46 mye: OK thanks, then it is very likely windows specific, on my desktop pc with XP it was relatively slow, on this laptop with win7 it is slow...
17:48 jonrafkind: its almost not even worhtwhile to debug the issue, just get a VM and develop in ubuntu or something
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19:55 tauntaun: This may be obvious, but I'm assuming that even if it didn't segfault etc., Racket's OpenGL library is too slow for real-time graphics (e.g., video games)?
19:55 jonrafkind: well, why would you assume such a thing
19:56 jonrafkind: the most obvious bottleneck in racket is the GC
19:58 samth: tauntaun, i believe the neil toronto and jay mccarthy have worked on writing 3d games in racket
19:58 tauntaun: OK, that makes me excited.
19:58 tauntaun: jonrafkind: I assumed so because John Reppy has said that his SML-based graphics stuff is too slow for real-time.
19:58 samth: the opengl library takes somewhat of a hit for the ffi
19:59 tauntaun: samth: you mean the ffi slows it down a bit?
19:59 samth: but you should ask on the list about it -- i know jay has done lots of 3d stuff
19:59 samth: tauntaun, yes -- the ffi does some marshalling/unmarshalling that you wouldn't be doing in C
19:59 tauntaun: ok, I'm a bit confused.
19:59 tauntaun: There are two graphics libraries.
19:59 tauntaun: Which one is the faster one.
20:00 (quit) carleastlund: Quit: carleastlund
20:00 samth: which two?
20:00 tauntaun: sgl and sgl/gl
20:01 (quit) jonrafkind: Ping timeout: 240 seconds
20:01 samth: i think they're pretty similar
20:02 samth: sgl/gl might be a little faster, since it does less translation
20:05 samth: for example, the sgl/example/gears.rkt program gets 500+ fps on my machine, and uses sgl
20:06 tauntaun: OK, another question: the Guide has stuff about creating languages.  Is there more written about this in the Reference or in some other part of the documentation?  I seem to recall a library that constructs parsers based on BNF input...I think I even recall seeing a library of Haskell-style parser combinators somewhere, but I can't find it.
20:06 samth: there are a bunch of relevant parts of the reference
20:06 samth: the parser-tools collection is the library that uses bnf
20:07 samth: if you've read the guide section, you might be interested in our paper, which i recently wrote about on the racket blog
20:08 tauntaun: "Languages as Libraries"?
20:08 samth: tauntaun, yes
20:10 samth: and feel free to ask questions about the paper on irc or by email
20:11 tauntaun: Great, thanks. To be clear, I'm only just starting to think about language design and don't even know Typed Racket yet.  I think it'll take me at least a few months to get to the right level to read this paper.
20:11 samth: tauntaun, knowing typed racket is def not needed to read the paper
20:11 tauntaun: Ok
20:11 tauntaun: ...then I'll get around to it sooner :)
20:12 samth: the paper is written to be accessible to a general programming language research audience
20:12 samth: ie, people who don't know much about racket, typed racket, or macros
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20:13 samth: but knowing more about racket and macros will help you get more out of it
20:13 tauntaun: OK...btw, I ran the gears example and am impressed.
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