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05:10 daniel_: what's the equivalent of % in clojure?   (vector-map (* 5 %) vector)   <-- so i can do something like this
05:13 rapacity: rudybot: (vector-map (curry * 5) (vector 1 2 3 4 5))
05:13 rudybot: rapacity: your sandbox is ready
05:13 rudybot: rapacity: ; Value: #(5 10 15 20 25)
05:13 daniel_: thanks rapacity
05:14 rapacity: you may want to check this out https://github.com/samth/fancy-app
05:14 rapacity: it'll allow you to write the above as
05:14 rapacity: (vector-map (* 5 _) (vector 1 2 3 4 5))
05:14 daniel_: currying is fine i think
05:15 daniel_: does racket have any tools for vector/matrix multiplication?
05:15 daniel_: rudybot: (* [1 2 3 4] [1 2 3 4])
05:16 rudybot: daniel_: your sandbox is ready
05:16 rudybot: daniel_: error: procedure application: expected procedure, given: 1; arguments were: 2 3 4
05:16 daniel_: rudybot: (* '[1 2 3 4] '[1 2 3 4])
05:16 rudybot: daniel_: error: *: expects type <number> as 1st argument, given: '(1 2 3 4); other arguments were: '(1 2 3 4)
05:16 daniel_: rudybot: (* (vector 1 2 3 4) (vector 1 2 3 4))
05:16 rudybot: daniel_: error: *: expects type <number> as 1st argument, given: '#(1 2 3 4); other arguments were: '#(1 2 3 4)
05:22 daniel_: hmm nice http://rosettacode.org/wiki/Matrix_multiplication#Racket
05:22 daniel_: racket seems even shorter than scheme and clojure
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06:14 daniel_: if i have '(1 0) '(0 1)  how can i join them to create '((1 0) (0 1) ... ?
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06:15 daniel_: (list '(1 0) '(0 1)) complains
06:20 _p4bl0: daniel_: it should work
06:21 _p4bl0: daniel_: I just tried and in works in the racket repl
06:22 daniel_: rudybot: (list (split-at (list 1 +i +i 1) 2))
06:22 rudybot: daniel_: error: context expected 1 value, received 2 values: '(1 0+1i) '(0+1i 1)
06:22 daniel_: this is my problem
06:22 rapacity: split-at returns 2 values
06:23 rapacity: (let-values([(l r) (split-at (list 1 +i +i 1) 2)]) (list l r))
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06:23 rapacity: rudybot: (let-values([(l r) (split-at (list 1 +i +i 1) 2)]) (list l r))
06:23 rudybot: rapacity: ; Value: ((1 0+1i) (0+1i 1))
06:23 daniel_: i see, interesting
06:23 daniel_: thanks
06:24 rapacity: can also be written as
06:24 rapacity: rudybot: (call-with-values (thunk (split-at (list 1 +i +i 1) 2)) list)
06:24 rudybot: rapacity: ; Value: ((1 0+1i) (0+1i 1))
06:26 keenbug: rapacity: i think you should say that (thunk sth) is the same as (lambda () sth)
06:28 keenbug: rapacity: sorry, didn't mean to criticise you if it seemed so
06:28 Shviller: Speaking of multiple values, I take it if a function returns more than one value, I'll have to kno how many an catch them all, to use it? IIRC in CL I could treat a function returning multiple values as a regular one, and it'd silently drop the extra values.
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06:48 daniel_: I have a vector of lists within lists #(((0) (0)) ((0) (0))), trying to foldl through summing the squares of each value
06:48 daniel_: is that the best way?
06:51 daniel_: i need some way of first creating a list like (0 0 0 0) to use foldl
06:51 daniel_: expanding everything out
06:56 daniel_: im using vector->list and then flatten, this is slow right?
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07:21 daniel_: how would i turn (1 2 3 4 5 6 7 8) into ((1 2) (3 4) (5 6) (7 8))?
07:25 bremner: write a recursive function is one way
07:27 daniel_: bremner, can you give me an example?
07:28 bremner: well, http://www.ccs.neu.edu/home/matthias/HtDP2e/htdp2e-part2.html has quite a few examples
07:29 daniel_: thanks
07:36 daniel_: is there an equivalent of vector-set for lists? i.e. replace a value at a certain index
07:51 daniel_: https://gist.github.com/1362080  <- i need to replace the % with each entry from the first vector-map...in this case currying doesn't work
07:52 daniel_: maybe i need apply? let me test
07:55 daniel_: think i need to get the order of the currying right
07:56 daniel_: got it, just needed (curry foldl) in brackets
07:58 daniel_: https://gist.github.com/1362080
08:07 daniel_: can anyone help me plot this on a graph? '#(0 0 0.9999999999999998 0 0)
08:07 daniel_: each vector pos is a pos on the x axis and the value is the y axis
08:09 daniel_: http://docs.racket-lang.org/plot/intro.html
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09:15 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/WTu-gQ
09:15 RacketCommitBot: [racket/master] add some debugging printfs in an effort to try to understand what's going wrong when this test runs in drdr - Robby Findler
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10:33 bsod1: hi, does Racket have a command to measure running time of a function?
10:43 bsod1: anyone?
10:53 _p4bl0: bsod1: yes, time
10:54 _p4bl0: rudybot: doc time
10:54 rudybot: _p4bl0: your sandbox is ready
10:54 rudybot: _p4bl0: http://docs.racket-lang.org/reference/time.html#(form._((lib._racket%2Fprivate%2Fmore-scheme..rkt)._time))
10:58 bsod1: _p4bl0: thanks!
10:58 (part) bsod1: "Konversation terminated!"
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13:43 offby1: rudybot: (time (cons 1 2))
13:43 rudybot: *offby1: your sandbox is ready
13:43 rudybot: *offby1: ; Value: (1 . 2)
13:43 rudybot: *offby1: ; stdout: "cpu time: 0 real time: 0 gc time: 0\n"
13:43 offby1: rudybot: (time (begin (make-vector 1000000) 'wow)
13:43 rudybot: *offby1: > (define a (make-vector 3 0))
13:43 offby1: rudybot: (time (begin (make-vector 1000000) 'wow))
13:43 rudybot: *offby1: ; Value: wow
13:43 rudybot: *offby1: ; stdout: "cpu time: 4 real time: 4 gc time: 0\n"
13:43 offby1: rudybot: (time (begin (make-vector 10000000) (void)))
13:43 rudybot: *offby1: error: out of memory
13:43 offby1: :-(
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15:21 offby1: rudybot: (require db)
15:21 rudybot: *offby1: Done.
15:22 offby1: rudybot: (define connection (sqlite3-connect #:database "/tmp/frotz.db" #:mode 'create))
15:22 rudybot: *offby1: error: current-directory: `exists' access denied for /usr/local/src/rudybot/
15:22 offby1: oh well
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16:04 tbelaire: Hey, I saw the code improvements post on reddit, and I'm going to start finding the uses of alists and replacing them with hashtables
16:05 tbelaire: as suggested by the page
16:07 samth: tbelaire: awesome!
16:09 tbelaire: There's only a handful of places assq is used
16:10 tbelaire: any other functions that indicate it's use?
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16:21 Em: is the normal way to make programs to have a file that gets read in when the program starts and re-written before it closes again?
16:22 Em: otherwise you can't have a program that lasts longer than when drscheme is open
16:23 Em: it seems like in order for racket to make changes to a file it has to re-write the whole thing.
16:26 tbelaire: So, in get-libs.rkt, it uses nested alists
16:27 tbelaire: would it be appropriate to replace them with hash-tables?
16:27 tbelaire: It's a constant in the file, so it will only be read
16:30 _p4bl0: hello, could someone change the line 181 of /collects/web-server/http/request.rkt from
16:30 _p4bl0: "    [(bytes-ci=? #"POST" meth)"
16:30 _p4bl0: to
16:30 _p4bl0: 
16:30 _p4bl0: argh sorry
16:30 _p4bl0: to "    [(or (bytes-ci=? #"POST" meth) (bytes-ci=? #"PUT" meth))
16:30 _p4bl0: I can make a patch but it is only one line
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16:36 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/6m3nog
16:36 RacketCommitBot: [racket/master] Make autocompletion fuzzier, similar to the doc search. - Sam Tobin-Hochstadt
16:40 samth: _p4bl0: probably a patch and email is better, b/c jay isn't around at the moment
16:40 _p4bl0: samth: ok thanks :-)
16:41 _p4bl0: samth: should I email him directly or send that to the dev mailing list?
16:45 offby1: Em: there are tons of ways to persist data.
16:45 offby1: Em: what you've described is one of them, but surely not the only way ... what sort of data are you dealing with?
16:47 samth: _p4bl0: either way should work
16:51 _p4bl0: samth: ok, thx
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17:17 _p4bl0: email sent :-)
17:19 _p4bl0: meanwhile, I'll just parse the raw post-data to build a bindings assq list when receiving a PUT request
17:21 RacketCommitBot: [racket] plt pushed 2 new commits to master: http://git.io/FfHGIQ
17:21 RacketCommitBot: [racket/master] db: fixed space leak in statement finalizer thread - Ryan Culpepper
17:21 RacketCommitBot: [racket/master] db: fix transaction contract bugs, added transaction tests - Ryan Culpepper
17:32 offby1: \o/
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17:47 Em: offby1: I want to make an application that lets me enter data for lots of different customers, by letting me go like (customer id value) and then it has all these customer data structures with all their information in it, and it will get updated in a big flat file of lists I guess, and then that can be used to generate reports or turned into csv for escel
17:47 Em: excel
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17:50 offby1: You might use a database for that
17:50 offby1: Or you might  indeed just rewrite the whole file every time -- if there isn't a ton of data, it will probably be fast enough
17:51 offby1: if this is important data, you must of course make sure you don't accidentally clobber good data with garbage
17:51 offby1: Another idea is to use your computer's file system as a crude database -- make directories for each customer; within each directory, name the file after the ID, and store the value in the file.
17:52 offby1: This assumes that either a) your customer names and the IDs are acceptable as file names; or b) it's easy to translate from them, to file names, and bak
17:52 offby1: back
17:53 offby1: I'd recommend the database thing except that as it happens, I'm struggling with racket's database support at this very minute :)
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18:19 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/9I-p9Q
18:19 RacketCommitBot: [racket/master] move predicate/c from unstable/contract to racket/contract. In process, - Robby Findler
18:21 offby1: does racket have an auto-builder?  I was unable to build a recent commit
18:21 offby1: if it has an auto-builder then I can a) see if the problem was my fault; and b) snag a binary if so
18:22 mithos28: offby1: drdr.racket-lang.org
18:22 offby1: as in "drdr give me the news"?
18:23 offby1: interesting ... hard to interpret, though
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19:01 offby1: ... so if I find that the build fails for me on master, but works on release -- d'ya suppose it's worthwhile for me to "git bisect" in order to find out which commit "broke" it?
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23:52 jonrafkind: whats the environment variable to see minor collections?
23:54 jonrafkind: ah PLTSTDERR=debug