00:00 offby1: I bet it was an off-by-one error in the range of the random number
00:03 cipher: nope, though I did fix that too
00:03 cipher: it was (for ([r (in-range (sub1 s))]) (let ([x (modexp x 2 n)])
00:04 cipher: that was binding x to the *old* binding for x
00:05 cipher: the algorithm calls for x <- x^2 mod n to repeat for each iteration of the loop
00:06 cipher: the quick fix was to not use the let and instead do a set! on x
00:09 offby1: yeah I was heading there too
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00:41 Demosthenes: oh how i long for racket -d ;]
00:41 Demosthenes: like perl -d ;]
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01:30 em: offby1: what do you like to use generators for? why do you say they are "_super_ cool" ?
01:38 cipher: they're great for not generating a huge list or taking up a lot of space all at once
01:38 cipher: their syntax is also pretty elegant
01:39 cipher: http://www.youtube.com/watch?v=Yx2xFsY7vmo
01:39 cipher: haha
01:52 ohwow: Hello.
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12:16 offby1: em: take a look at https://github.com/offby1/doodles/blob/master/plt-scheme/web/amazon/group.rkt
12:16 rudybot: http://tinyurl.com/3tsvy99
12:16 offby1: I think that'd be really hard to write without generators
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12:50 cipher: I love racket
12:54 realitygrill: yay
12:54 rapacity: I hate noise
12:54 ohwow: hm i have homework to do, but instead i am playing with racket gui :(
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14:06 em: offby1: what does that do?
14:06 em: and what does (provide group) do?
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14:08 ohwow: em: (provide group) provides GROUP for use into other moduels
14:08 ohwow: *modules
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14:21 Dre: Hello everyone, I'm a noob trying to learn racket under linux. Currently I'm using Dr.Racket and reading the htdp.org course. Am I missing any helpful information ?
14:22 JoelMcCracken: that sounds like you are off to a good start
14:22 ohwow: yea
14:23 JoelMcCracken: the second part of the equation is to be here :)
14:23 Dre: ok, thanks. I'm in section 6 and it looks like it will take a while until I code something useful on my own :D
14:24 JoelMcCracken: do you already know how to program? I found SICP to be a more interesting introduction to scheme
14:24 Dre: I'll try to be here
14:26 Dre: I've some coding skills, but only on Fortran and Matlab. But I want to go a little further.
14:26 ohwow: JoelMcCracken: some might argue that HtDP is a better start
14:26 ohwow: (then sicp)
14:27 Dre: well, so I guess that's a taste problem
14:27 Dre: i'll try to have a look at it
14:27 Dre: thanks
14:29 JoelMcCracken: ohwow: yeah, it may be. But I couldn't put SICP down, while HTDP was a little boring to me, as a senior at uni. No offense to the authors, of course! I've recommended it to a number of my friends who mentioned an interest in learning to program.
14:30 Dre: Well, I don't mind it being boring (It takes a lot to bore me) and it looked a pretty step-by-step approach to me
14:30 Dre: so I started there
14:31 JoelMcCracken: good
14:32 Dre: well, thanks a lot again for your time
14:32 Dre: time to get hands to work
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14:43 cipher: oh cool, RacketCon is in Boston!
14:43 cipher: I'll be there!
14:58 offby1: em: the "group" function takes a sequence and a number, and more-or-less returns another sequence of the same elements, but grouped into lists of the given siez.
14:58 offby1: size.
14:58 offby1: em: the idea was: I want to send some requests to Amazon Web Services, and it's inefficient to send each request on its own; instead, I "batch" them up into groups.
14:58 offby1: so I use this thing to do that.
14:59 offby1: "provide" is more or less "export" -- it means "make this name visible outside of this module".
14:59 offby1: I'm surprised you didn't know that
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15:08 eduardo_: hi,  i was reading a article about compiling lambda calculus and there's this code http://matt.might.net/articles/compiling-up-to-lambda-calculus/code/compile.rkt
15:08 rudybot: http://tinyurl.com/3mybtjp
15:09 eduardo_: but i cant understand the need for eval to run the last test
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15:20 wwwd: I am following "How to Design Programs" and I am finding lots of Templates in the examples that do not compile. Is the template always suposed to compile?
15:21 cipher: can you link to one?
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15:23 wwwd: http://www.htdp.org/2003-09-26/Book/curriculum-Z-H-13.html#node_sec_9.1
15:24 wwwd: or do you mean copy it to a pastbin and link?
15:25 cipher: the latter would be better
15:25 wwwd: Ok! Sorry I'm new to all this. Give me a sec.
15:26 wwwd: https://gist.github.com/5c000920ed1de56afac7
15:28 cipher: yeah that isn't expected to be run, it is representative code. the ellipsis aren't intended to be syntax
15:28 em: offby1: yeah i never used a provide. I thought when you require a module that means you automatically can use anything of its procedures.
15:30 cipher: wwwd: I think they're just trying to show how as a conceptual template the code can be molded into something more useful
15:31 wwwd: cipher:  So do you generaly use templates or are they more of a learning exercise?
15:31 cipher: think it's up to your coding style
15:33 wwwd: Ok! I have some questions regarding a solution to a problem I wrote. If I post a link would you take about 5 min and give me a little feed back?
15:34 cipher: sure
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15:35 wwwd: cipher: Thanks https://gist.github.com/5c000920ed1de56afac7
15:35 offby1: em: nope, when you require a module, you only get those things that the module has provided.
15:35 offby1: It's not like perl or python; it's stricter.
15:36 em: Oh i see, so a module has more stuff in it than it provides?
15:36 em: or, it might?
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15:38 wwwd: cipher: so I had been nameing the <vars> to represent the input (i.e. a-circle or a-rect) then I decided the code can recognise it so just changed to object? So the funcion name indicates what is being processed but object just lets me know something is. Is that a good idea or will it make it hard to follow later when things get bigger?
15:40 offby1: em: it certainly might.
15:41 offby1: em: keeping stuff private is crucial
15:41 wwwd: cipher: Also, is my style generaly ok and am I using helper functions correctly?
15:42 offby1: em: I can't find an really good explanation of _why_ though
15:43 cipher: I haven't coded in scheme long enough to really anwer these stylistic questions.  I'd say that you've done--calling it object--is probably fine. I personally would probably call it circle when the function implies that it has to be a circle, and using object when the function uses a cond to pick the appropriate path based on the type
15:43 offby1: em: generally you try to provide a simple interface, consisting of a small number of data types and functions.  As long as you don't provide any more than you need to, it means you're free to redesign stuff inside the module, without having to change any of the module's clients.  This is a big deal.
15:45 wwwd: cipher: Ok. Thanks for your time. Back to the problem at hand!!!
15:46 offby1: wwwd: it all looks fine to me.
15:46 offby1: It's pretty verbose, but I'm guess that you haven't yet been taught what to do about that.
15:46 offby1: s/guess/guessing/
15:48 wwwd: offby1: No I've taught myself a little python and now I'm working on Racket. I think How to Design Programs gets into that a little later.
15:48 wwwd: ...Also, I am hoping at some point I will "get it!!!"
15:50 wwwd: offby1: did you ping me with a caret symbol or how did you do that?
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16:01 offby1: how did I do what?
16:01 offby1 never reveals his secrets
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16:03 offby1: say, racket peeps
16:03 offby1: rudybot: eval (format "~a" (string->bytes/utf-8 "\u1234\uabcd"))
16:03 rudybot: *offby1: ; Value: "ሴ\uABCD"
16:03 offby1: that works fine as you can see
16:04 offby1: but is it documented somewhere that ~a, when given some bytes, effectively does bytes->string/utf-8 on 'em?
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16:10 ryandanas_: Would anyone have any experience with this error: compile: access from an uncertified context to unexported variable from module: "/Applications/Racket v5.1.1/collects/racket/contract/private/base.rkt" in: apply-contract ?
16:11 ryandanas_: im making a pretty basic web app. I had to switch back to an older version of the code. Now everytime I make even the most subtle of changes, I get this error. Removing the changes does not stop the error either.
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16:24 bremner_: do you maybe have compiled versions (.zo) of your code around?
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16:30 bremner_: ryandanas_: there is no need to go to private messages, maybe somebody else has better ideas. I would look for "compiled" subdirectories generated by racket and remove them if you have trouble after switching versions.
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16:34 ryandanas_: that worked! thanks.
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17:06 bremner_: ryandanas_: great!
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