00:01 evhan_: speaking of which, is the github repo a mirror, or are changes pushed directly there?
00:01 jonrafkind: a mirror or something
00:01 jonrafkind: the git repository lives at northeastern
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07:09 kingping: moin
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08:10 Lajla: kingping, mighty hailz to you all.
08:11 kingping slaps Lajla with thunk
08:13 Lajla calls the thunk and produces the delayed computation to slap kingping back with.
08:13 kingping: :D
08:13 kingping evals Lajla
08:14 Lajla bites back at kingping's unsave evaluation to and modifies his top level environment.
08:14 kingping: heheheh
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14:27 georgek: hi, I'm having some kind of timestamp problem in DrRacket after I updated a repo and tried to re-run a test -- the error is Documents\downloads\rktcod\compiled\drracket\errortrace\tmp1280600653700399042 @ 2010-7-31 11:24:13) is before source-file date (C:\Documents and Settings\george\My Documents\downloads\rktcod\loader.rkt @ 2010-7-31 21:24:44), which appears to be in the future
14:28 jonrafkind: rebuild maybe?
14:28 georgek: yeah, I even deleted the dir and tried to start over, deleted everything in App data/Racket, but still the same problem
14:29 georgek: is there another dir of temporary files somewhere on Windows?
14:43 georgek: using racket from the CL works fine, it's just DrRacket
14:44 georgek: I've noticed that once you start DrRacket subsequent starts are much quicker; is there a way to delete whatever files it's caching?
14:44 jonrafkind: there might be user/you/Application Data
14:44 jonrafkind: you can look in there
14:46 georgek: there's something for Racket, which I deleted the contest of, but that didn't help
15:15 georgek: interesting, uninstalling and reinstalling Racket doesn't help either
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15:44 georgek: wow, completely wiping everything Racket related and reinstalling still doesn't fix it
15:55 chandler: Is it possible that the problem is that your source file really does have a timestamp in the future? Where did this file come from?
15:58 chandler is still annoyed that Gmane's racket.user and racket.devel have broken threading
15:59 georgek: from a git repository
15:59 chandler: Is the error you're getting actually wrong?
16:00 chandler: If the error message you pasted was from today, your computer's clock is a day behind.
16:02 georgek: dang, you're right!
16:02 chandler: Ah. Always read the error message. :-)
16:02 offby1: By dang!
16:02 georgek: haha
16:02 georgek: indeed
16:02 georgek: the problem is I don
16:02 georgek: don't even always know what day it is
16:04 chandler: I know the feeling; I've been a day off all week. NTP might be a good idea here.
16:04 chandler: Sigh. It looks like the Gmane web archive is missing a whole chunk of user and devel messages, too.
16:05 chandler: http://news.gmane.org/gmane.comp.lang.racket.user
16:05 chandler: Doesn't look like what I see via NNTP.
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16:20 chandler emails Mr. Lars Gmane about this annoyance.
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17:54 evhan: sorry if this has come up before, but has anyone had success compiling racket 64-bit on os x
17:54 evhan: or rather (since im sure someone has), what flags should i be looking at to get this to work?
17:55 offby1: evhan: if you don't get an answer here, capture the output from the build, and send it to the dev. list; I'm sure they'll want to fix it
18:04 evhan: will do, thanks
18:39 shkk: All, Can I pass a function defined using let expression as an argument to a function ?
18:41 offby1: sure
18:42 offby1: rudybot: eval (let ((func (lambda (x) (+ 3 (* 4 x))))) (build-list 10 func))
18:42 rudybot: offby1: ; Value: (3 7 11 15 19 23 27 31 35 39)
18:50 offby1: shkk: I see two problems with what you pasted:
18:50 shkk: All, I have written this code that squares each value in the list. But its not working
18:50 shkk: http://codepaste.net/voivu4
18:51 offby1: 1) you're not actually invoking the function after you define it;
18:51 offby1: 2) you're not using "letrec", which in your case, you need, since you've defined a _recursive_ function.
18:51 offby1: rudybot: eval (letrec ((square (lambda (inputList) (cond ((null? inputList) '()) (else (cons (* (car inputList) (car inputList)) (square (cdr inputList)))))))) (square (list 10 11 12)))
18:51 rudybot: offby1: ; Value: (100 121 144)
18:52 shkk: Hmmm .. well I have a defined function REV (reverse a list) to which I would input the result of square function
18:54 offby1: that's nice
18:57 shkk: What? How can I pass an let expression as a argument to my function? My function is REV <func> <input list> . Can I pass a letrec expression in the <func> part ?
18:57 offby1: I don't think you're asking what you want to ask ...
18:57 offby1: here's how to pass a let expression as an argument to a function:
18:58 offby1: rudybot: eval (add1 (let ((x 3)) x))
18:58 rudybot: offby1: ; Value: 4
18:58 offby1: just do it.
18:58 offby1: but I don't think that's what you're asking.
18:59 offby1: this might work: (rev (letrec ((square (lambda (inputList) (cond ((null? inputList) '()) (else (cons (* (car inputList) (car inputList)) (square (cdr inputList)))))))) square) (list 10 20 30))
18:59 offby1: let's see.
18:59 shkk: offby1; My function REV takes a function and an input list as argument. function is first applied to the input list which is passed to REV that will reverse the modified list
18:59 offby1: sure
18:59 offby1: rudybot: eval (define (rev func lst) (map func (reverse lst)))
18:59 offby1: rudybot: eval (rev (letrec ((square (lambda (inputList) (cond ((null? inputList) '()) (else (cons (* (car inputList) (car inputList)) (square (cdr inputList)))))))) square) (list 10 20 30))
18:59 rudybot: offby1: error: car: expects argument of type <pair>; given 30
19:01 offby1: rudybot: eval (define (rev func lst) (func (reverse lst)))
19:01 offby1: rudybot: eval (rev (letrec ((square (lambda (inputList) (cond ((null? inputList) '()) (else (cons (* (car inputList) (car inputList)) (square (cdr inputList)))))))) square) (list 10 20 30))
19:01 rudybot: offby1: ; Value: (900 400 100)
19:01 offby1: works fine.
19:04 shkk: Now. Yes it does. Thanks both
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