00:00 bremner: rudybot: imperialist tool
00:00 rudybot: bremner: happy tax deadline day, imperialist running dogs
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02:28 onixie: hi, I post an issue on github 2 months before. But there is no reply. https://github.com/plt/racket/issues/101
02:29 onixie: So I came here for a reason. ( I should came here first to ask). If someone told me a reason, I think I can close that issue.
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03:21 bird_: hello everyone !
03:21 bird_: are u ol?
03:22 jonrafkind: ole!
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03:23 bird_: who has material?
03:23 jonrafkind: mr. plum
03:23 bird_: about racket
03:23 jonrafkind: what sort of material. you want docs or code?
03:24 bird_: docs
03:24 jonrafkind: http://docs.racket-lang.org
03:24 bird_: about common lisp
03:25 bird_: do you have msn?
03:25 jonrafkind: no
03:25 jonrafkind: irc will do fine
03:25 jonrafkind: racket is not common lisp
03:25 bird_: yes
03:25 jonrafkind: do you also want documentation on common lisp?
03:26 bird_: no
03:27 bird_: i  thought can code in racket ,use common lisp
03:27 jonrafkind: i dont know what that means
03:27 jonrafkind: common lisp is not racket
03:28 jonrafkind: you mean if you can code in racket then you can learn common lisp too?
03:28 bird_: yeah
03:28 jonrafkind: well I suppose there is some truth to that
03:28 jonrafkind: but racket and common lisp are pretty different
03:28 bird_: if i made a mistake?
03:29 jonrafkind: if you want to learn common lisp you should just download common lisp and program in it
03:29 bird_: are u  familiar with ide about common lisp?
03:29 jonrafkind: no
03:30 bird_: i want made exe on pc
03:31 bird_: with common lisp
03:31 bird_: thank u
03:31 bird_: i see
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04:03 mhr: I'm using http://www.eecs.berkeley.edu/~bh/ss-toc2.html (Simply Scheme) to learn Scheme as it seems like a really gentle intro to Comp Sci, and I need to load a few programs before I start the book that came with it.  The problem is that when I tried to run any of the programs in Dr. Racket, they all had errors.  Can you help?  Here is the ftp link with all the programs: ftp://anarres.cs.berkeley.edu/pub/scheme/
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12:20 offby1: mhr: chances are those programs are written using an older version of the language than the one that drracket uses by default ... prepending ``#lang r5rs'' to each might fix the problem
12:40 jonrafkind: how do you get scribble to output a lettermode document?
12:46 offby1: me personally?
12:46 offby1: I distract it with a steak or a pork chop or something, then reach in and snatch the document
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12:52 jonrafkind: ok i ran texconfig-sys and changed the paper size
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18:53 yoklov: if i'm developing a racket library, should i be using contracts to ensure the types of my functions inputs?
18:54 yoklov: or should I check them and use error?
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19:20 jonrafkind: contracts are basically checking and calling error
19:21 yoklov: so I should do that?
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19:27 yoklov: and then that would be basically enough in terms of providing error messages about invalid inputs?
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19:59 jonrafkind: well its probably 80% at least
20:00 jonrafkind: it depends on your contracts, if you say (x number?) but x has to be between 1 and 20, then you might want to check for that in the function
20:00 jonrafkind: of course you can write a contract that checks for a number between 1 and 20
20:00 jonrafkind: most people dont go through that much effort though, contracts are usually just a dynamic type check
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20:14 asumu: You might as well build it into the contract since it's probably easier.
20:15 asumu: rudybot: (define/contract n (and/c (>=/c 1) (>= 20)) 15)
20:15 rudybot: asumu: your sandbox is ready
20:15 rudybot: asumu: error: >=: expects at least 2 arguments, given 1: 20
20:15 asumu: rudybot: (define/contract n (and/c (>=/c 1) (>=/c 20)) 15)
20:15 rudybot: asumu: error: n: self-contract violation, expected: (and/c (>=/c 1) (>=/c 20)), given 15, which isn't (>=/c 20) <NEWLINE>   contract from: (definition n), blaming: (definition n) <NEWLINE>   contract: (and/c (>=/c 1) (>=/c 20)) <NEWLINE>         at: #<undefined>:1.17
20:15 asumu: (okay with the right inequality)
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20:16 jonrafkind: so easy!
20:17 asumu: Seems easier than doing (unless (and (>= 1) (<= 20)) (raise-whatever-it-is ...))
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20:20 asumu: (and more importantly, gives you blame information whereas the manual check does not)
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21:15 mhr_: I'm having trouble with PLaneT, this is my first package I've tried to load.  I'm trying to download the simply scheme package from here: http://planet.racket-lang.org/package-source/dyoo/simply-scheme.plt/2/2/, and I tried to type in this: http://paste.lisp.org/+2SNP, but it had this error: http://paste.lisp.org/+2SNQ.  I'm using Windows 7, if that helps.  Do you know what's going wrong?
21:47 asumu: mhr_: you can't require planet packages like that.
21:47 asumu: There's a special require form for planet packages.
21:48 asumu: Each package's download page shows the command you use to require it.
21:48 asumu: Incidentally, if you're looking for an intro CS textbook I'd recommend looking at HtDP.
21:48 asumu: It's also a better fit for Racket.
21:49 asumu: http://www.ccs.neu.edu/home/matthias/HtDP2e/index.html
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22:30 mhr_: I think I'd like to read both books.  Oh, so this is it: http://planet.racket-lang.org/display.ss?package=simply-scheme.plt&owner=dyoo
22:30 rudybot: http://tinyurl.com/bv9a54r
22:31 mhr_: asumu: thanks for helping
22:33 mhr_: To elaborate on what I said earlier about the books, it'd probably be beneficial for me to know smaller Scheme, and then to learn the superset Racket
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