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11:07 laszlokorte: Hi, anybody here?
11:08 offby1: z
11:08 offby1: nobody here but us zombie processes.
11:11 laszlokorte: I am starting to learn racket at school and the first task is to build a function to convert degrees into cardinal direction names. The task is not very precise in terms of to which fraction the function should work. The stupidest solution would be to use a if-clause with 16 or 32 cases. But I guess there is a more clever way with some recursion or something? Any hints?
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11:14 offby1: actually I can't think of any way that's fundamentally better than your "stupid" way.
11:15 laszlokorte: I would assume it would be shorter in code (?)
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11:17 laszlokorte: something like in the first step i decide between N E S and W and the I call the function recursively with the rest of the degree and get N E S or W again. so I get something like NE or SW and so on NNW, NEbE...
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11:19 offby1: I'd do it something like this: http://ix.io/3iP
11:20 offby1: I didn't think to do it recursively, but you might be on to something there.
11:20 offby1: If the names of the directions are themselves recursively structured ...
11:25 laszlokorte: oh, thank you, the recursive thing was more an general idea of mine because I assumed the naming structure is kind of recursive but it could be wrong
11:26 offby1: I've never thought about it, but it's intriguing.
11:26 offby1: if you pulled that off, I suspect your teacher will be impressed.
11:32 laszlokorte: hm ok, thank you
11:32 laszlokorte: is there a function giving me a position of one string in another?
11:33 laszlokorte: In other languages like ruby or php it would be called strpos
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11:39 offby1 ponders
11:39 offby1: probably :)
11:39 offby1: you need to get familiar with http://docs.racket-lang.org/ -- it's pretty good
11:40 offby1: certainly you can do a regular-expression match
11:40 offby1: that's probably the official way.
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11:45 offby1: this will probably do for "strpos", if there isn't already something better built in: http://ix.io/3iQ
11:46 offby1: oops, s/car/caar/
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11:58 laszlokorte: I do not like this code :D https://gist.github.com/4007699
11:59 offby1: me neither
11:59 offby1: the two functions are too similar.
11:59 chandler: Make it a macro!
11:59 offby1: it's probably easy to combine them into one.
12:00 offby1: chandler: now he has two problems!
12:00 offby1: what you want is a leetle tiny database of strings->numbers, which can also work the other way.
12:00 (nick) bitonic` -> bitonic
12:00 offby1: an alist would be fine.
12:00 chandler: Yeah, you don't actually need a macro. The pattern is pretty simple, and you could just generate two hash tables (one for each direction)
12:00 offby1: *gasp*
12:01 offby1 is aesthetically shocked
12:01 offby1: I personally wouldn't bother with two hash tables with such a small set of data, but sure.
12:01 chandler is aesthetically shocked by alists.
12:01 offby1: as long as you only spell out the constants _once_ and initialize _twice_.
12:02 chandler: You shouldn't need to spell out the constants at all.
12:02 offby1: chandler: didn't you ever read that thing about Richard Feynman sitting in on one of Doug Hofstadter's lectures?  I keep coming back to that ... Feynman kept giving deliberately stupid answers to Hofstadter's problems, and claiming that they were excellent answers.  I admire that.
12:02 offby1: Alists are deliberately stupid.
12:02 chandler: No, this I did not read, but it sounds amusing.
12:03 chandler: It's not the data structure so much as the process of working with them.
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12:04 chandler: (Unless there's some procedure roughly equivalent to `hash-ref' for alists which I don't know about.)
12:04 mithos28: dict-ref?
12:05 offby1 nods gravely
12:06 chandler: Ah, that'd be it.
12:09 offby1: I suspect the thing to do is: first figure out the relevant quadrant.  Then figure out which -third- of the quadrant you're in.
12:09 offby1: put the quadrants into a circular list, like this: N-E-S-W-N-E-S-W- ...
12:10 offby1: if you're in the middle third of a quadrant, then the resulting string is just the quadrant's name ...
12:10 offby1: otherwise it's the quadrant's name followed by "by" and then the name of the adjacent quadrant.
12:10 offby1: Or something like that.
12:10 offby1 leaves the rest as an exercise for the reader
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14:55 RacketCommitBot: [racket] plt pushed 3 new commits to master: http://git.io/KEuugA
14:55 RacketCommitBot: racket/master c375042 Robby Findler: fix test so that labels can be regexps (as was already...
14:55 RacketCommitBot: racket/master e1760fa Robby Findler: add find-labelled-windows
14:55 RacketCommitBot: racket/master 5768009 Robby Findler: Revise the language dialog to emphasize the teaching...
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15:52 laszlokorte: any racket plugin for sublime text 2?
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15:52 stamourv: laszlokorte: Not that I know of.
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16:03 mye: so, after coding for three nights straight in drracket my mouse hand hurts. What I need is an eye-focus tracker plugged in to the computer that activates syntax arrows when I look at an identifier!
16:06 stamourv: Sounds like an awesome PLaneT package. ;)
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16:52 RacketCommitBot: [racket] plt pushed 2 new commits to master: http://git.io/XK8Vhg
16:52 RacketCommitBot: racket/master 77fb5ec Robby Findler: working on something to show derivations
16:52 RacketCommitBot: racket/master 4669b6b Robby Findler: adjust tests for the new language dialog...
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16:52 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/gGrrPg
16:52 RacketCommitBot: racket/master a6384e7 Robby Findler: Oops, didn't mean to push this one...
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17:37 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/pSjhzg
17:37 RacketCommitBot: racket/master 6ab4085 Danny Yoo: documentation: adding data/heap examples
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17:40 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/SfP7Tg
17:40 RacketCommitBot: racket/master 4901c67 Danny Yoo: documentation: correcting my broken example for heap-copy
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17:57 dyoo: Is there a link from the wiki at https://github.com/plt/racket/wiki on the racket-lang home page?  (Discoverability concern.)
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18:04 dca: What can be an issue if in geiser pressing C-x C-e does not send eval to repl?
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18:05 dca: it just prints the result in minibuffer and that's it
18:10 dca: output appears in *geiser dbg*
18:21 stamourv: dca: Have you tried the geiser mailing list?
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18:25 dca: stamourv: not yet. i thought that could be the default behaviour. is it?
18:26 stamourv: I don't know, I don't use geiser.
18:26 stamourv: But I really should.
18:26 stamourv: Trying it has been on my to-do list for a while.
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19:01 offby1: it's pretty good.
19:01 offby1: also, jao is helpful and (used to be, anyway) frequently available.
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20:31 RacketCommitBot: [racket] plt pushed 10 new commits to release: http://git.io/S8zXxA
20:31 RacketCommitBot: racket/release 7c49cd5 Ryan Culpepper: fix doc typo...
20:31 RacketCommitBot: racket/release fd81d53 Matthew Flatt: fix error-message code...
20:31 RacketCommitBot: racket/release 8bffa07 Matthias Felleisen: basic history, please merge...
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21:08 dsevilla: guys, I have a problem with typed/racket
21:08 dsevilla: I'm just starting to learn, and tried the first example
21:09 dsevilla: the "distance" function with the type specification for x and y to be "Real" fails in sqrt, because it expects Real and gets Number
21:09 dsevilla: any hints?
21:10 dsevilla: should I just set distance to treat Number instead of Real?
21:10 dsevilla: I just took the example code in the typed/racket documentation
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21:37 mye: gah why is drracket allocating (leaking?) so much memory… it was at over 2GB yesterday  :\
21:38 mye: I did set the memory to unlimited but I think that's for running the programs ?!?
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21:49 asumu: Color theory is cool. https://github.com/takikawa/pict-utils/blob/master/ryb.rkt <-- try requiring the 'samples' submodule
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22:06 mye: are there other ways to prepend something to input-port P than to (input-port-append #t P2 P) ? I can't get this to work in a lexer (it doesn't see the bytes in P2)
22:07 mye: ah, that would be because I didn't set! it...
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