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02:53 jonrafkind: whats the differenc between "cpu" time and "real" time from (time ...)?
02:53 jonrafkind: real is how much time elapsed but cpu is how long the program ran on the cpu..?
02:58 mye: that's what the docs seem to say
02:59 mye: (time (sleep 2))
02:59 mye: cpu time: 99 real time: 2006 gc time: 0
02:59 mye: rudybot: (time (sleep 2))
02:59 rudybot: mye: your sandbox is ready
02:59 rudybot: mye: ; stdout: "cpu time: 0 real time: 2001 gc time: 0\n"
03:00 jonrafkind: ok
03:01 mye: the cpu time in my sleep is probably drracket
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03:19 RacketCommitBot: [racket] plt pushed 3 new commits to master: http://git.io/KAECLg
03:19 RacketCommitBot: racket/master c39ad69 Mike Sperber: Synch German string constants with latest.
03:19 RacketCommitBot: racket/master 114f47f Mike Sperber: Merge branch 'master' of git.racket-lang.org:plt
03:19 RacketCommitBot: racket/master 59d378c Mike Sperber: Synch German string constants with latest.
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03:44 sambario: does anybody have a problem with new DrRacket 5.3.1, (version for Windows, 64-bit)?
03:45 sambario: DrRacket crashed when i do this
03:45 sambario: 1) I open DrRacket and type this:  #lang web-server/insta (define (start request)   (response/xexpr    '(html      (head (title "My Blog"))      (body (h1 "Under construction")))))
03:45 sambario: 2) I click "Run" and Internet Explorer appear and everithing's fine. But when i close Internet Explorer, in the REPL pane i get this error: . . ..\..\Program Files\Racket\collects\racket\port.rkt:1135:4: tcp-read: error reading   systen error: Unknown error; errno=10054
03:45 sambario: 3) I then click "Stop" and get "Web Server stopped". But then, Racket crashes (sometimes immediately, sometimes after clicking "Start").
03:45 sambario: Does anybody here can reproduce the sampe problem???
03:45 asumu: sambario: I haven't had any problems, but I'm on Linux. Does it give you a message when it crashes?
03:46 sambario: unfortunately no
03:46 sambario: i'm on windows 7
03:47 asumu: I have a laptop with windows, so I can try it there...
03:47 asumu: sambario: in any case, if you can send a bug report that'
03:47 asumu: d be great.
03:47 asumu: You can submit bug reports through DrRacket.
03:47 sambario: really?
03:48 asumu: Yeah, go to Help->Submit bug report
03:50 sambario: ok, i just submitted the bug
03:51 asumu: Thanks.
03:52 sambario: but I don't hope too much because it seems that this only occurs to me
03:52 sambario: :(
03:54 asumu: Oh, I got it too.
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03:54 asumu: But only if I set my default browser to IE.
03:56 sambario: oh god!
03:56 sambario: yes, my default browser is IE
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05:22 epsil: how do I define transparent structs in lazy racket?
05:22 epsil: if I do #lang lazy (define-struct posn (x y) #:transparent), I get the error: "expected argument of type <inspector or #f>; given '#:transparent"
05:22 epsil: it works fine in standard racket, though
05:23 shriphani: hi everyone. I have a question about the plot module. I see that plot/dc is the way to update an existing plot. Is there a simpler way to do it from the plot function itself (instead of spawning a new window i.e.)
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08:45 mye: GRML, I have a test with check-equal? that fails although the expected and actual value are printed exactly the same! It's a structure with nested hash-table though, so somewhere there must be something not comparing
08:47 mye: the structure is transparent and the tables compare equal in my tests
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09:01 mye: I got it, I tried to compare an immutable hash-table created by #hash() with one created by (make-hash)
09:03 mye: it's certainly confusing when mutable hash tables are printed as mutables
09:03 mye: *immuatbles
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09:56 RacketCommitBot: [racket] plt pushed 2 new commits to master: http://git.io/7efzig
09:56 RacketCommitBot: racket/master 867f2d3 Robby Findler: use the real rectangles-intersect? predicate, not a broken one
09:56 RacketCommitBot: racket/master 4421e22 Robby Findler: when changing the error arrows, only invalidate the editor...
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10:59 asumu: epsil: does using `struct` work instead?
10:59 asumu: (it seems to work for me)
11:00 asumu: Actually both work for me, so I'm not sure what's going on.
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11:08 mye: just wanted to say how much I love (for*/list) *heart*  :P
11:09 asumu: mye: yeah, it's pretty great.
11:31 asumu: My home machine takes so much longer to render the docs than my work machine. Sigh.
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11:47 mye: I always wondered if it only rebuilds the scribble files that actually changed
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12:03 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/XJrEjA
12:03 RacketCommitBot: racket/master d22532d Asumu Takikawa: Fix Custodian type
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12:04 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/6HbKxA
12:04 RacketCommitBot: racket/master b4a98af Asumu Takikawa: Fix whitespace in test
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12:19 stamourv: jonrafkind: You're writing your dissertation in Scribble?
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12:27 bartbes: just 5 minutes ago I was wondering whether racket had pattern matching
12:27 bartbes: I now realize I've missed so much opportunities
12:30 asumu: bartbes: if you're running a pre-release, also check out `define/match` :)
12:31 bartbes: I'm not, but I'm extremely interested in this
12:31 bartbes: are there pre-release docs online?
12:31 asumu: bartbes: http://pre.racket-lang.org/docs/html/reference/match.html?q=define/match#(form._((lib._racket/match..rkt)._define/match))
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12:34 bartbes: that is pretty damned awesome
12:34 stamourv: bartbes: `match' is awesome! Being able to define your own match expanders makes it really powerful.
12:35 stamourv: Now, whenever I have to use other pattern matchers, they feel primitive.
12:38 bartbes: those examples pointed me towards the curried function shorthand
12:39 bartbes: I never cease to be amazed by racket
12:42 bartbes: (or scheme in general)
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12:52 epsil: bartbes: what other pattern matchers are you comparing `match' with? :)
12:53 bartbes: epsil: you mean stamourv, I assume
12:58 epsil: bartbes: yeah, sorry
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13:12 mithos28: epsil: haskell, scala, ml are more primitive than racket's
13:13 mithos28: They only have normal struct matching
13:14 mithos28: one simple thing you can do in racket, is have one pattern match match multiple structs
13:14 mithos28: this is done in the internals of TR for result types
13:15 mithos28: the actual value can be a single result or a list of results, but the matcher for a single result also matches multiple results when there is exactly one result
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13:50 stamourv: epsil: What mithos28 said.
13:51 stamourv: + selective matching of fields, `app' patterns, etc.
13:51 mithos28: app patterns are in haskell as view patterns
13:52 stamourv: Are view patterns as general?
13:53 mithos28: apply function to value in the hole, and match against resulting value
13:53 mithos28: do app patterns get you anything else?
13:54 stamourv: I don't think so. You're probably right.
13:55 mithos28: why cannot TR do types on nested pattern matching
13:55 mithos28: is match's expansion that hard to understand
13:59 mithos28: Is it unreasonable to expect this to typecheck, https://gist.github.com/4052137
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14:01 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/WjljeQ
14:01 RacketCommitBot: racket/master c533019 Robby Findler: improve drracket's response to an unhappy aspell program...
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15:00 stamourv: mithos28: My guess is that `match' with `...' may expand into something tricky.
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17:00 Twey: Is there a function that performs an n-ary Cartesian product?
17:00 shriphani: hi everyone. I am trying to use racket on an ubuntu installation and it can't find plot-new-window? (which I need to see a plot). Does anyone have any ideas ?
17:00 mithos28: rudybot: (map list '(1 2 3) '(4 5 6) '(7 8 9))
17:00 rudybot: mithos28: your sandbox is ready
17:00 rudybot: mithos28: ; Value: ((1 4 7) (2 5 8) (3 6 9))
17:01 mithos28: Twey: is that what you want?
17:01 Twey: mithos28: No
17:02 Twey: (f '(a b c) '(1 2 3)) → '((a 1) (a 2) (a 3) (b 1) (b 2) (b 3) (c 1) (c 2) (c 3))
17:02 mithos28: ah, let me think. I'll be afk for like 10
17:02 Twey: I've written one, but it seems like something that ought to be built in
17:03 stamourv: rudybot: (for*/list ([i (in-range 5)] [j (in-range 11 15)]) (list i j))
17:03 rudybot: stamourv: ; Value: ((0 11) (0 12) (0 13) (0 14) (1 11) (1 12) (1 13) (1 14) (2 11) (2 12) (2 13) (2 14) (3 11) (3 12) (3 13) (3 14) (4 11) (4 12) (4 13) (4 14))
17:03 stamourv: Twey: ^
17:03 stamourv: shriphani: Which version of Racket are you using?
17:04 stamourv: It's included in the new 5.3.1, I don't know about older versions.
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17:05 stamourv: You can also view plots in DrRacket.
17:06 Twey: stamourv: Hmm, but can I apply that to arbitrary lists?
17:06 Twey: If I have a list of two dozen lists of which I want the Cartesian product, for example
17:08 stamourv: You'd need a macro for that, so you may be better off rolling your own.
17:08 stamourv: But I agree that it would be a nice addition to racket/list.
17:09 Twey: Okay, I'll stick with mine, then.  Thanks.
17:09 Twey: I'm translating a Haskell program, & Haskell has ‘sequence’ for arbitrary monads
17:09 stamourv: If you want, you can submit a pull request that adds it. :)
17:10 Twey: Hm, good idea.
17:10 stamourv: (it = cartesian product, not sure `sequence' would make sense in Racket)
17:11 Twey: http://paste.lisp.org/display/133643 — how's this definition?
17:12 Twey: (huh, the CAPTCHA for paste.lisp.org is no longer ‘lisp’)
17:13 stamourv: You can use `append-map' instead of `apply' + `append' + `map'.
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17:14 stamourv: Also, `compose'd functions can be inefficient, so you may want to use an explicit lambda there.
17:15 Twey: Ooh, point — thanks.
17:15 Twey: They can?  Why's that?
17:17 stamourv: `compose' works on functions of any arity, so it has to do more than just wrap a lambda.
17:17 stamourv: It came up on the mailing list a couple of days ago.
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17:18 Twey: Ah, right
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17:27 asumu: shriphani: BTW, you can plot more than one thing by just providing a list of renderers.
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18:05 asumu: Wow, I rather like the topsl logo:
18:06 asumu: http://topsl.sourceforge.net/
18:06 asumu: (cygwin paste is annoying)
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19:38 RacketCommitBot: [racket] plt pushed 2 new commits to master: http://git.io/i_jTzA
19:38 RacketCommitBot: racket/master 7c5db43 Asumu Takikawa: Add typed version of collatz benchmark
19:38 RacketCommitBot: racket/master 90f6f1b Asumu Takikawa: Adjust benchmark test driver for TR
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22:02 Twey: How about this one: (f 'x 5) → '(x x x x x)
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22:04 jonrafkind: rudybot: (for/list ([i 5]) 'x)
22:04 rudybot: jonrafkind: your sandbox is ready
22:04 rudybot: jonrafkind: ; Value: (x x x x x)
22:06 Twey: Hm, right, thanks
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23:34 maxwellhansen: Is there a function in Racket to check if a number is prime?
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23:37 jonrafkind: http://dave.dkjones.org/posts/2012/2012-01-25-sieve-in-racket.html
23:38 offby1: maxwellhansen: actually there's a nice library called "math" that has prime-checking and tons of other stuff
23:38 maxwellhansen: offby1: Awesome, thanks!
23:39 jonrafkind: offby1, wheres that
23:39 offby1: I'm trying to find it :)
23:41 offby1: http://planet.racket-lang.org/display.ss?package=math.plt&owner=soegaard
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