00:12 offby1: hm
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00:26 raphie: hey, does anyone know how I can map over a list and make a new list containing two items for every list item?
00:27 raphie: for example, if I have (list 1 2 3) and my function should produce (+ x 2) and (+ x 3) for each list item, my result would be (list 3 4 4 5 5 6)
00:27 jonrafkind: (for/fold ([out '()]) ([item in]) (append out (list item item)))
00:27 neilv: is this a homework question?
00:27 jonrafkind: did you eat your broccoli?
00:28 raphie: neilv: nope, not hw
00:28 raphie: the goal is to produce a list of all possible bit combos to test some karnaugh maps I was playing with
00:28 raphie: as in, generating (list (list false false) (list false true) (list true false) (list true true))
00:30 neilv: http://paste.org/54763
00:30 jonrafkind: cars and cons and cdrs ohmy!
00:31 jonrafkind: and throw in some recursion for extra goodness
00:31 raphie: I love me some higher order functions, thanks jonrafkind
00:31 raphie: but thank you two neilv
00:31 raphie: *too
00:32 jonrafkind: i was trying to think of how to do it with nested for/list things but its not so trivial
00:32 jonrafkind: you would still need an append somewhere in there
00:32 neilv: the for forms obfuscate efficient solutions for problems like this
00:33 neilv: that "append" messes up your linear algorithmic complexity for you
00:33 raphie: I guess in my view efficiency doesn't really matter unless it starts to matter, if you know what I mean
00:33 raphie: I go for simplicity and readability
00:33 jonrafkind: i concur with rapacity
00:33 jonrafkind: raphie,
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00:39 offby1: is "Rackout" like "Peace Out"?
00:40 raphie: actually, once I implemented it, neilv's solution works pretty well: https://gist.github.com/cd1ee4cf95ef88556afc
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01:05 neilv: like "rock out"
01:05 neilv: bbl
01:15 offby1: Freak Out!!!
01:15 offby1: We're Only In It For The Money
01:20 raphie: lovely quote from a friend: "Haskell's a total prude, but Racket will let you set-bang it once in a while if you're desperate."
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13:30 klr: Hi!
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13:51 offby1: you again!
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14:31 offby1: ``If your algebra teachers had known about the “arithmetic of images” that you saw in the preceding section, you could have produced movies in algebra instead of boring number sequences.'' -- That sounds a lot like Vi Hart (http://www.youtube.com/user/vihart)
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16:07 mye: I'm trying to understand this macro: http://paste.lisp.org/display/132225
16:08 mye: What I can't wrap my head around is when does the for/list within the with-syntax run?
16:09 mye: this is from http://docs.racket-lang.org/unstable/Automata__Compiling_State_Machines.html
16:09 rudybot: http://tinyurl.com/8lr5tjo
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16:15 mye: kleene star confusion, I have it :-/
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16:26 Fare: hi
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16:27 Fare: Is there available source code of good/great presentations made with racket, to get inspiration from?
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16:43 asumu: Fare: Robby's "Run your Research" talk (there's a video online) is on PLaneT.
16:44 asumu: mye: it runs when the macro is expanded.
16:46 Fare: asumu: thanks!
16:47 Fare goes prepare his presentation at the Boston Lisp Meeting next Thursday...
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17:20 Fare: I'm unfamiliar with PLaneT. How do I download http://planet.racket-lang.org/display.ss?package=ryr-talk.plt&owner=robby ?
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17:25 samth: you can use `raco planet fetch`
17:26 samth: or you can just use the `require` spec there
17:26 mye: then raco planet open, I learned this recently, this will give you a folder of your choice
17:28 mye: It would be cool if check syntax showed which … in a macro pattern corresponds to which … in the template
17:29 Fare: samth: replacing <<file>> by main ?
17:30 samth: you can just leave off the file
17:30 samth: 	(require (planet robby/ryr-talk:1:2))
17:30 Fare: also - running one's presentation is great -- but can racket open a pipe to a cl process to run my code?
17:30 samth: rudybot: doc pipe
17:30 rudybot: samth: your typed/racket sandbox is ready
17:30 rudybot: samth: not found in any library's documentation: pipe
17:30 samth: rudybot: doc make-pipe
17:30 rudybot: samth: http://docs.racket-lang.org/reference/pipeports.html#(def._((quote._~23~25kernel)._make-pipe))
17:31 samth: rudybot: doc system
17:31 rudybot: samth: http://docs.racket-lang.org/reference/subprocess.html#(def._((lib._racket%2Fsystem..rkt)._system))
17:31 samth: more likely to be what you want
17:31 Fare: I mean - a persistent session so I don't have to initialize a new cl at every form
17:31 samth: have a look at the docs for `system`
17:32 Fare: (is there an example for doing so -- even better, from a presentation?)
17:32 Fare: btw, thanks a lot!
17:32 samth: of running CL?
17:33 samth: you could look at the source of dracula
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17:33 Fare: oh nice - raco planet fetch dracula ?
17:33 samth: yeah
17:34 samth: or https://github.com/carl-eastlund/dracula/tree/master/collects/dracula
17:35 Fare raco planet fetch cce dracula.plt 8 23
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17:44 gf3: My brain is failing me, what's the function to execute an arbitrary amount of expressions and only return the last one's value
17:44 gf3: (something x y z) ; z
17:44 bremner: begin ?
17:45 gf3: bremner: Yes, thank you!
17:45 Fare: begin is not a function, it's a special form.
17:45 gf3: Fare: Ahh, thank you
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21:26 Fare: Hum, how do I install fonts so that slideshow can see them?
21:38 offby1: no idea :-(
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21:39 offby1: Probably depends on your operating system
21:39 Fare: debian
21:39 neilv: i don't know why, but i thought i could put test code inside (module+ test CODE ...) and have it not execute when i press the Run button in drracket
21:43 neilv: Fare: if you put them in "~/.fonts/", does it find them then?
21:44 Fare: nope
21:44 Fare: but maybe it has to do with punctuation? Optima\-ExtraBlack vs Optima, ExtraBlack
21:44 Fare: meh
21:46 neilv: do the fonts show up in output of "fc-list" command?
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21:46 neilv: http://wiki.debian.org/Fonts
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22:10 Fare: it shows as Optima\-ExtraBlack:style=Extra Black
22:16 asumu: neilv: there's a preference that sets what submodules are run on "Run"
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22:22 Fare: do I need to restart X or something?
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23:48 neilv: when was json support added to core racket?
23:48 jonrafkind: thousands of years ago.. before man as we knew him
23:48 neilv: they used dherman's representation, which is problematic
23:49 jonrafkind: march 12th 2012 is when eli imported it
23:50 neilv: maybe it was discussed on the list and i didn't notice or i forgot
23:51 jonrafkind: i dont see anything about it being included into the core on the list (users and dev)
23:51 neilv: one of the reasons i'm doing this racket home theatre thing is as an exercise and demonstration of doing mobile web apps with racket
23:51 jonrafkind: but it shouldnt matter right, you can just use your own json library
23:52 neilv: i'm going to have to make a neil/json-writing planet package someday. not today
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