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12:30 hugbug: hi peeps
12:31 hugbug: i need help with dr. racket
12:31 hugbug: anyone can help?
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12:32 hugbug: hellooooooooooo
12:38 confounds: hugbug: all quiet on the western front
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12:42 offby1: hugbug: weren't you in the first scene of "Pulp Fiction", with Tim Roth?
13:04 hugbug: no
13:04 hugbug: very funny
13:05 bremner: hugbug: learn IRC in 10 easy lessons. Lesson 1. IRC is asynchronous. Ask your question, and wait for an answer.
13:06 hugbug: In August 2010, the University of Waterloo hosted the International Olympiad in Informatics (http://www.ioi2010.org). Every contestant, leader, and guest was given a bag of swag items when they arrived. The bags were assembled in the Math building and later transported to Village 1. The packing room had large, medium, and small boxes that could hold 10, 8, or 6 of the bags respectively for transportation.
13:06 hugbug: Write a function called total-boxes that will determine the total number of boxes used to transport the bags. The function will consume the total number of bags needing to be transported, the number of large boxes, the number of medium boxes, and the number of small boxes. You should use up the boxes that hold 10 first, then if necessary use boxes that hold 8, then if necessary use boxes that hold 6 bags
13:06 hugbug: Note that you may not need to use any boxes holding 8 or 6 bags, and it is possible that the final box used is not filled to capacity. You may assume that there are at least enough boxes available to transport all of the bags.
13:06 bremner: Lesson 2, people are wary of doing your homework for you.
13:07 hugbug: For example (total-boxes 1000 50 50 50) will produce 117. The built‐in functions min, max, and/or ceiling may be useful.
13:07 hugbug: i'm not asking you to do my homework
13:07 hugbug: i am asking for assistance in understanding the problem and coding the solution
13:07 bremner: Lesson 3. for more than a few lines of text, consider a pastebin site, or a link
13:08 hugbug: again, bremner, i'm not the greatest in programming. i'm new to this and require help
13:09 offby1: hugbug: try asking a question :)
13:09 hugbug: offby1, what is the math behind this question?
13:10 offby1: hell if I know.
13:10 hugbug: then your useless
13:10 offby1: for this particular problem, indeed.
13:10 offby1: thank you for pointing that out, though; sometimes I get too full of myself, y'know?
13:10 hugbug: haha
13:11 offby1: I have the vague sense that I'd fill up all the largest boxes first, then move to smaller ones.
13:11 hugbug: i know that but how would you begin to code this
13:11 offby1: I also suspect that once you hand in this assignment, the teacher will turn around and say "OK, now do the same assignment again, except this time there are five sizes of box, holding 12, 10, 9, 7, and 3 bags respectively"
13:11 bremner leaves before he learns that he too is useless
13:12 offby1: I think you could get away with simple integer division.
13:12 offby1: in fact it sounds very much like converting an integer to a sequence of digits.
13:12 hugbug: i can use the ceiling function to round
13:12 offby1: are you forced to use some generic scheme with no interesting libraries?
13:13 offby1: If not, I'd use racket's quotient/remainder function or whatever it's called.
13:13 offby1: rudybot: quotient/remainder
13:13 rudybot: *offby1: eval (quotient/remainder (/ 120 17) (/ 18 7)) ; foo
13:13 offby1: eval (quotient/remainder (/ 120 17) (/ 18 7))
13:13 offby1: rudybot: eval (quotient/remainder (/ 120 17) (/ 18 7))
13:13 rudybot: *offby1: error: quotient/remainder: expects type <integer> as 1st argument, given: 120/17; other arguments were: 18/7
13:13 offby1: rudybot: eval (quotient/remainder 120 17)
13:13 rudybot: *offby1: ; Value: 7
13:13 rudybot: *offby1: ; Value#2: 1
13:13 offby1: slick
13:14 hugbug: what did you and rubybot just do?
13:14 offby1: hugbug: he'll evaluate racket code if you put "rudybot: eval" in front of it
13:14 offby1: given 193 bags, how many of the 10-bag boxes can you completely fill? (hint: the answer is 19)
13:15 offby1: given 3 bags, how many of the 8-bag boxes can you completely fill? (hint: the answer is "none")
13:15 offby1: given those same 3 bags, how many of the 6-bag boxes can you completely fill? (hint: the answer is again "none", but you can half-fill one of them)
13:15 offby1: I think that's the general idea
13:16 offby1: it's basically long division.
13:16 hugbug: mhmm
13:16 hugbug: i get what your saying
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15:48 ahc_: is there a way to do async IO with racket? do any of the std libs have support for that?
15:54 offby1: pretty sure there must be
15:54 offby1: ... although I can't think of any specifics
15:54 offby1: hm, the word "asynchronous" only appears once in the index, in some other context.
15:57 eli: ahc_: Yes, and in probably every style you prefer.
15:58 eli: There are functions that read as much of the input as possible, so you can do polling, and you can also use the normal functions inside a thread, so it blocks until it has enough input while the rest is running.  And there's also CML-style events that could be used on top of all of this.
16:02 ahc_: ah, right. thanks.
16:03 ahc_: do you see any problem in working through all the stuff in The Little Schemer with racket?
16:04 ahc_: language-feature-wise
16:05 offby1: there will probably be minor quirks that you'll have to accommodate.
16:05 offby1: Perhaps The Little Schemer assumes that conses are mutable, e.g.
16:05 offby1: in that case you might want to use one of the "legacy" languages
16:11 ahc_: ok, that doesn't sound bad
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16:33 offby1: I suspect it'll be tolerable.
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20:13 dherman: I'm having trouble getting stack traces in DrRacket 5.0.1
20:13 dherman: anyone available to help me out?
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20:13 jonrafkind: turn off debugging in the preferences
20:13 jonrafkind: for some reason that helps
20:13 dherman: jonrafkind: turn it *off*?
20:13 jonrafkind: yea
20:13 dherman: weird
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20:50 Publius: anyone here??
21:00 jonrafkind: no
21:00 jonrafkind: everyone is here is a robot
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21:21 Publius: I am getting started with Racket. I don't get the teachpacks??
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22:24 Parkotron: In the racket interpreter, how can I tell if a call to "load" succeeds?
22:26 neilv: i believe you can catch the exception
22:27 Parkotron: neilv: As someone just starting with Lisp today, that seems a bit over my head. :)
22:27 neilv: also, unless you're sure you want to use "load", you probably want to use something else
22:28 neilv: Parkotron: are you trying to code something, or trying to learn?
22:28 Parkotron: neilv: That's probably the case. I have some definitions in a file and I'd like to load them into the interpreter to play with.
22:28 Parkotron: neilv: Learn.
22:28 neilv: ok, you probably want to use modules and "require"
22:29 neilv: and for learning, try working your way through htdp, the racket guide, or some intro to scheme book
22:29 jonrafkind: that would force him to use provide and all that stuff, load is probably easier for fooling around
22:29 Parkotron: neilv: I'm restricted to R5RS, so modules aren't an option, right?
22:29 Parkotron: This is homework.
22:30 neilv: ah
22:30 neilv: yes, you can use "load" in r5rs. but you can't catch exceptions in it
22:31 Parkotron: I just want to figure out why, after calling (load "mystuff.scm") none of the identifiers are in scope.
22:31 neilv: are you using drracket?
22:32 Parkotron: neilv: No. I have no X11. I'm using the racket executable.
22:32 Parkotron: neilv: I've played with DrRacket before, though.
22:35 neilv: you're in the repl, and you enter (load "mystuff.scm") and then you get another ">" prompt, and you enter one of the identifiers, and it says undefined?
22:35 Parkotron: neilv: That's exactly it.
22:35 neilv: you don't get an error message right after the "load"?
22:35 Parkotron: Nope.
22:36 neilv: maybe there's something funny with mystuff.scm
22:36 Parkotron: neilv: Could be. It's just a half dozen function definitions.
22:38 neilv: why not make a simple test file that contains one line and try that.  like: (define x 42)
22:39 Parkotron: neilv: Okay, that works.
22:40 Parkotron: Okay, it turns out I had to remove the #lang r5rs line.
22:41 neilv: yeah, that would do it
22:41 Parkotron: neilv: Does the racket repl only support the Racket language?
22:42 neilv: didn't used to. let me double-check
22:42 neilv: racket -il r5rs
22:42 neilv: try that
22:42 Parkotron: neilv: The man page is a little brief. :)
22:43 neilv: er, wait
22:44 neilv: yeah, that should work
22:44 neilv: are you running it inside of emacs, or just from terminal window?
22:45 Parkotron: neilv: Separate terminal.
22:45 neilv: if you're familiar with emacs, you can use emacs in the terminal, which will make things much easier
22:46 neilv: but if you're comfortable with the terminal, and are in a hurry, that will work too
22:46 neilv: racket -ill r5rs readline
22:47 Parkotron: neilv: Thanks a lot!
22:47 neilv: in a terminal, readline will let you do things like use up-arrow to recall earlier commands
22:47 Parkotron: Yeah, I've been missing that. ;)
22:47 Parkotron: Is there a way to clear all definitions from a running repl?
22:48 Parkotron: Or does load do that automatically?
22:48 neilv: assume that you can't clear anything
22:49 Parkotron: neilv: I can live with that. Thanks.
22:50 neilv: try to get use of drracket somehow. it runs on most computers made in the last several years
22:50 neilv: you can do simple assignments with just the repl, but you're missing out on lots of goodness
22:52 Parkotron: Nah, I think I'm fine now. I have vim and screen setup so I can quickly copy stuff from vim to the repl.
22:52 Parkotron: Hmm. r5rs mode makes list values a hard to read jumble of mcons.
22:54 neilv: hold on
23:00 neilv: (#%require (only scheme/base print-mpair-curly-braces print-as-expression))
23:00 neilv: (print-as-expression #f)
23:00 neilv: (print-mpair-curly-braces #f)
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