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03:38 RacketCommitBot: [racket] plt pushed 2 new commits to master: http://git.io/LD1p5g
03:38 RacketCommitBot: [racket/master] Some more improvements and fixes. - Eli Barzilay
03:38 RacketCommitBot: [racket/master] Drop Infogroep mirror. - Eli Barzilay
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05:43 sindoc: Is there a way to have structures constructed using keyword arguments without having to define an extra constructor function manually?
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06:57 jt123: hey people
06:57 jt123: anybody able to help me... wondering how to search for something like (^ x 0) and replace with 0
06:57 jt123: http://pastebin.com/NfTPdRW4
06:57 jt123: in normal-poly p
07:42 chturne: jt123, can you rephrase that? The code you pasted doesn't make a lot of sense to me. I'm assuming you're speaking of a string substitution, since x^0 = 1 not 0. You could use a regex for that, or Racket's match form.
07:43 chturne: jt123, If you're wanting to do the more obvious rewrite of (^ x 0) --> 1, then you can map thru each term, check if the car is ^, then check if the second argument is zero, and cons 1 onto the rest of the map instead of this expression. Racket's match would be very handy here.
07:43 jt123: chturne: basically i have a polynomial on which calculations are performed. So want to replace with 1 sorry... not 0
07:45 chturne: (car '(^ a b)) == '^ and (caddr '(^ a b)) == 'b. So from that information you can decide whether to cons the expression, or cons a 1.
07:48 jt123: ok so the cons a 1 replaces the whole of (^ x 0) with 1?
07:50 chturne: I mean you'd cons the numeral '1' onto the result of reducing the cdr of a polynomial, rather than the '(^ a b) expression.
07:51 chturne: (when b is 0)
07:54 jt123: chturne: sorry, im not very experienced with lisp
07:54 jt123: or scheme
07:55 jt123: chturne: would it be possible for you to give an example please?
08:01 chturne: jt123, I haven't checked whether the following actually works, but it's a rough outline of my suggestion. http://pastebin.com/V3EJKFRT
08:03 chturne: That (empty? poly) should be lifted out of the let, but hopefully you get the general idea..
08:08 chturne: jt123, here's one that actually works: http://pastebin.com/iSTYSJGd
08:08 jt123: thanks chturne :)
08:09 chturne: (it's not robust!)
08:10 jt123: haha no worries i'll try it with my code
08:10 jt123: ill let you know how it goes
08:11 RacketCommitBot: [racket] plt pushed 2 new commits to master: http://git.io/OCAHaw
08:11 RacketCommitBot: [racket/master] Change the keybindings dialog to be a frame, and make it react - Robby Findler
08:11 RacketCommitBot: [racket/master] fixed bug in the way aug:keymap extracts the names - Robby Findler
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09:53 Blkt: good day everyone
10:02 jt123: hey Blkt
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10:05 Blkt: :D
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11:38 mithos28: Should launcher applications access the collects directory of the installed racket? I would assume they should, but my program seems to not being do so.
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12:28 yoklov: anybody know if using the dc's built-in transformation methods is faster than just doing the math manually?
12:29 yoklov: hrm, theres probably no way it would be slower...
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12:59 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/ajs6ug
12:59 RacketCommitBot: [racket/master] Yet more tweaks and fixes. - Eli Barzilay
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13:14 RacketCommitBot: [racket] plt pushed 4 new commits to master: http://git.io/1WGLqQ
13:14 RacketCommitBot: [racket/master] redex: adjust the way metafunction tracing is printed so you - Robby Findler
13:14 RacketCommitBot: [racket/master] redex: when there are no duplicate names in a pattern, don't do the - Robby Findler
13:14 RacketCommitBot: [racket/master] remove (broken) attempt at optimization Jay suggested - Robby Findler
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13:45 yoklov: chars should be eq? to eachother right?
13:45 mithos28: yoklov: no
13:45 yoklov: oh.
13:45 yoklov: hrm.  eqv?
13:46 mithos28: yes
13:46 yoklov: or just use char=
13:46 yoklov: oh
13:46 yoklov: okay.
13:46 mithos28: http://docs.racket-lang.org/reference/eval-model.html?q=eq%3F#(part._model-eq)
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13:47 mithos28: sorry that doesn't have any useful information
13:47 mithos28: http://docs.racket-lang.org/reference/characters.html?q=eq%3F
13:47 mithos28: chars are eq if they are ascii
13:48 yoklov: okay
13:48 yoklov: the ones i'm using are but i'll still use eqv? to be safer
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14:15 RacketCommitBot: [racket] plt pushed 2 new commits to master: http://git.io/0iKTuQ
14:15 RacketCommitBot: [racket/master] net/mime: allow any subtype, exns as exn:fail subtypes; doc fixes - Matthew Flatt
14:15 RacketCommitBot: [racket/master] fix JIT bug - Matthew Flatt
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14:52 yoklov: so, i have a monochrome bitmap which i'd like to be able to draw in different colors (e.g. draw only the parts which are black, but be able to choose the color they are drawn as).  I can draw only the black parts by specifying the bitmap (itself) as the mask argument to draw-bitmap in dc<%>, and I've tried using the "color" argument, but it seems not to do anything?  Is my only option to have a solid (colored) bitmap of the same si
14:52 yoklov: ze, which i recolor and then use the monochrome bitmap as the mask?
14:53 yoklov: i mean the obvious answer is "no clue"
15:02 yoklov: wait no, the problem is that this bitmap is color for some reason.
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15:23 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/ytQxWw
15:23 RacketCommitBot: [racket/master] Another typo. - Eli Barzilay
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16:48 anttih: I have some code that has been written for MzScheme, can I use that language still with racket?
16:48 yoklov: it is a bummer when your code is spending over half of its time in a utility function.
16:48 yoklov: antti: yeah
16:48 yoklov: anttih*
16:49 anttih: yoklov: how?
16:49 yoklov: #lang mzscheme i think
16:49 anttih: it has many source files, can I define that globally or something?
16:50 yoklov: maybe with something from racket/runtime-path (theres some weird module stuff in there) but not that i know of
16:50 yoklov: if they say (module mzscheme at the front that works too
16:52 yoklov: it might just work with racket though.
16:52 yoklov: http://docs.racket-lang.org/mzscheme/index.html?q=mzscheme
16:52 anttih: the error that I mostly see is the use of plain '()'
16:52 anttih: that is () vs '()
16:52 yoklov: weird, I didn't know that that was allowed in mzscheme
16:53 anttih: apparently
16:54 yoklov: hrm.  indeed it is.
16:54 yoklov: that can't be that common though, can it?
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16:55 mercur764: hi everybody
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16:55 mercur764: can someone help me?
16:56 yoklov: you should probably just ask and if someone can they'll answer
16:56 anttih: yoklov: not that common, AFAIK
16:56 yoklov: how many times does it happen in that program, i mean?
16:57 yoklov: right, how would you know
16:57 anttih: yoklov: the codebase is the SINK Kernel implementation http://web.cs.wpi.edu/~jshutt/kernel.html
16:57 anttih: yoklov: now I get a different error: "else: not allowed as an expression in: else " :-)
16:58 mercur764: firstly I wanna make a manifield with racket but ı have no code with that pls help me
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16:58 samth: mercur764: what is a manifield?
16:59 mercur764: sorry samth minefield
16:59 mercur764: game
16:59 samth: mercur764: how much programming have you done?
17:01 mercur764: I have nothing done yet I'm a student and now we are learning drracket in the school pls help me
17:02 yoklov: mercur764: minefield is a fairly simple game, but the GUI toolkit with racket isn't particularly simple, you might want to wait till after you've at least taken this course...
17:03 yoklov: however, should you be impatient, there are example gui games that are provided with racket
17:04 mercur764: yoklov I must to reach this gAM
17:04 mercur764: game
17:04 mercur764: and I have not a long time
17:05 yoklov: err, why not?
17:06 samth: mercur764: i recommend using the `universe' toolkit for learning how to program in racket
17:06 yoklov: https://github.com/plt/racket/tree/master/collects/games or in your <racket-home>/collects/games directory
17:06 mercur764: can you say me manefield code with dr racket or say me how can ı found
17:06 samth: mercur764: start here: http://www.ccs.neu.edu/home/matthias/HtDP2e/index.html
17:06 yoklov: it probably doesn't exist.
17:07 yoklov: it is quite possible nobody's done minefield in racket
17:07 mercur764: :((((
17:07 mercur764: thnx for your help
17:08 yoklov: err? you're welcome.
17:09 mercur764: samth do you know this game code ?
17:09 samth: mercur764: what game code?
17:10 mercur764: manefield samth
17:10 samth: if you're looking for someone to give you code to a game, then you can look at the link
17:10 samth: that yoklov gave you
17:10 samth: those are the games that ship with racket
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17:10 mercur764: yes but manefiled in not exist
17:10 samth: why do you need minefield written in racket?
17:11 mercur764: because my homework
17:11 samth: then i recommend *doing* your homework
17:11 samth: rather than asking us to help you copy from somewhere else
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17:11 yoklov: can't learn to program without doing it a lot :)
17:13 mercur764: Yes ı know but if ı know this game make sure that the I do myself without asked someone but ı dont know how can ı do this game just ı wanna a little bit help for your
17:13 mercur764: from you
17:17 mercur764: anyway thank you for your help samth and yoklov
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17:31 yoklov: samth: to be honest (when i was starting) i always felt like the universe toolkit was frustruatingly far away from actually writing a game
17:31 samth: yoklov: really?
17:31 samth: i'm surprised
17:31 samth: it's pretty easy to write something simple and fun
17:31 samth: see, for example: http://www.ccs.neu.edu/course/cs2510h/assign02.html
17:32 jonrafkind: is that a game from 1974?
17:32 samth: jonrafkind: it's a game from the second week of class
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17:33 yoklov: yeah, i had seen examples, but it still felt? i don't know, like there's too much magic going on behind the scenes
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17:37 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/MlVxJg
17:37 RacketCommitBot: [racket/master] better JIT repair - Matthew Flatt
17:37 yoklov: so even though it looked significantly easier than learning racket/gui it wasn't worth it because it wouldn't actually let me know how it was done...
17:37 yoklov: that was my perspective at least
17:38 yoklov: also i was coming from a course on sicp and i didn't really trust materials from other books, haha.
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18:58 samth: yoklov: indeed, universe isn't designed for explaining guis, but for letting students implement simple ones
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21:59 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/-F7dcQ
21:59 RacketCommitBot: [racket/master] Allow cross-site use of the status script. - Eli Barzilay
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