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01:00 Fare: eli: I've started implementing your scribble syntax in CL
01:00 Fare: but then, I backtracked and started writing a LL(\omega) parsing infrastructure.
01:00 Fare: hopefully, I won't backtrack into implementing monadic foo first.
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13:28 alecbenzer: is there a special vi mode for racket (ie more than just regular scheme highlighting)
13:28 jonrafkind: you mean in vim itself?
13:28 jonrafkind: there is not, as far as I know
13:28 jonrafkind: there are, however, vim bindings for drracket (made by me) so you could use the drracket ide and still use vim
13:29 alecbenzer: I meant a mode for vim, but not necessarily built in
13:29 jonrafkind: although my bindings aren't nearly as feature complete as the real vim
13:29 jonrafkind: there is 'set mode=lisp'
13:29 jonrafkind: which does some scheme/lispish stuff more than highlighting
13:30 jonrafkind: oops, its 'set lisp'
13:30 jonrafkind: you can make vim do lisp-style indentation by doing lisp-words+=define,foo,bar,...
13:31 alecbenzer: right now I have it set up to treat racket files with its scheme mode, which works pretty well. there are just minor things that bug me a bit. things like "#:mutable" for a struct are highlighted as if they were errors
13:31 jonrafkind: whats scheme mode?
13:33 alecbenzer: hm? if you do :set filetype=scheme it should treat the buffer your editing as a scheme file, with appropriate highlighting, indenting, etc
13:34 alecbenzer: i just have "au BufNewFile,BufRead *.rkt set filetype=scheme" in my .vimrc
13:34 jonrafkind: oh ok, i just use filetype plugin on or whatever
13:34 jonrafkind: which sets the filetype automatically
13:34 jonrafkind: err, you're right i have that au *.rkt thing too
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18:39 justaguy: hello
18:39 justaguy: anyone here?
18:40 justaguy: I just have a quick question
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18:55 Idonteven: anyone?
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19:53 newbie_: hi
19:54 newbie_: i am new to scheme, looking for a comprenhensive list of difference betwen scheme R6RS and racket macro system
19:56 (join) hi
19:56 (nick) hi -> Guest93886
20:00 newbie_: hi
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21:13 offby1: hi
21:14 jonrafkind: hi
21:15 jonrafkind: newbie_, i dont know of such a thing
21:15 jonrafkind: you can read various papers about racket's macro system I suppose
21:18 jonrafkind: newbie_, http://www.cs.utah.edu/plt/publications/macromod.pdf you can start there
21:18 jonrafkind: although to be honest, i dont know a whole lot about the r6rs macro system
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22:44 lightbulb: need help with understand racket
22:44 lightbulb: anyone available
22:45 offby1: ^-^
22:45 lightbulb: offby1
22:45 offby1: lightbulb:
22:45 lightbulb: can you help me with something
22:45 offby1: depends.
22:45 offby1: you gotta ask first :)
22:46 lightbulb: k well its a lab i must complete and i am having answering the qustion
22:46 lightbulb: question*
22:46 lightbulb: well understanding it
22:46 lightbulb: the question is:
22:46 lightbulb: Scientific notation is a way of writing very large or very small numbers using a few digits (known as the significant digits) and a power of ten. For example 1.475 x 109 is equivalent to 1 475 000 000. The number of digits included before the exponent are known as the significant digits. In the previous example there are four significant digits. Write a function called sn->num that consumes a string representing the scientific nota
22:47 offby1: that got cut off.
22:47 offby1: maybe paste the assignment to (for example) gist.github.com
22:47 lightbulb: OK
22:47 lightbulb: ok*
22:47 lightbulb: give me a second
22:47 lightbulb: thanks offby1
22:48 offby1: rudybot: eval (read (open-input-string "2.23e20"))
22:48 rudybot: *offby1: ; Value: 2.23e+20
22:48 offby1: there, you're done.
22:49 lightbulb: i posted it
22:49 lightbulb: on the website
22:49 lightbulb: the question wasn't finished
22:50 offby1: ?
22:50 lightbulb: offby1, have you taken a look at the question
22:50 offby1: no, I have no idea what website you pasted it on
22:51 lightbulb: ok, i'm just going to paste the full question into IRC
22:51 lightbulb: Scientific notation is a way of writing very large or very small numbers using a few digits (known as the significant digits) and a power of ten. For example 1.475 x 109 is equivalent to 1 475 000 000. The number of digits included before the exponent are known as the significant digits. In the previous example there are four significant digits. Write a function called sn->num that consumes a string representing the scientific nota
22:51 offby1: but you see that doesn't work.
22:51 offby1: There's a 500-character limit.
22:51 offby1: so I only get to see the first bit of it.
22:51 lightbulb: produces the equivalent numeric value. You may assume that all numbers written in scientific notation will include a single digit before a decimal point, at least one digit following the decimal point, the characters "x10^" (meaning "times 10 to the power of"), and the exponent that may be any integer.
22:51 offby1: aahh
22:52 lightbulb: For example (sn->num "1.457x10^9" 4) will produce 1457000000 and (sn->num "1.23456x10^-4" 6) will produce 0.000123456. The built‐in function expt will allow you to calculate an exponent. The built‐in function string- >number will produce the numerical equivalent of a consumed string that contains a valid number. For example (string->number "1.23") produces 1.23 and (string->number "-5") produces -5.
22:52 lightbulb: there
22:52 lightbulb: 3 bits
22:52 lightbulb: i'm not sure how to do this question
22:53 offby1: rudybot: eval (read (open-input-string (regexp-replace "x10\\^" "123x10^9" "e")))
22:53 rudybot: *offby1: ; Value: 123000000000.0
22:53 offby1: there ya go
22:53 offby1: done
22:54 offby1: just replace the "x10^" with the letter "e", then call 'read' on the result.
22:54 lightbulb: uhm...(kinda speechless)
22:54 lightbulb: no idea what you did and how you did it
22:54 lightbulb: i forgot to mention
22:54 lightbulb: oh
22:55 offby1: I described what I did: I replaced the "x10^" with the letter "e", then called 'read' on the result.
22:55 lightbulb: that the following must be used: ;; Assignment 1, Question 3  (define (sn->num sn-string sig-digits)   ...)
22:55 offby1: something tells me your prof won't like that answer, but _I_ like it very much.
22:55 lightbulb: def. won;'t
22:55 lightbulb: because we havent used the string commands you did
22:55 offby1: pity :)
22:55 lightbulb: we only used string-->number and substrng
22:55 lightbulb: and thats what needs to be used
22:56 lightbulb: is there any way you can describe it using that
22:56 offby1: it sounds like a pain in the ass.
22:56 neilv: you also need "string-length"
22:56 offby1: It's like three or more problems glued together.
22:56 lightbulb: haha
22:56 neilv: well, you *could* do it without "string-length", but it would be even more inefficient
22:56 lightbulb: indeed
22:56 offby1: First you'd read the digits before the decimal point, and accumulate them into the integer part ...
22:57 offby1: then read the digits up to, but not including, the "x"; there's your fraction.
22:57 offby1: then discard the x10^
22:57 offby1: then read the remaining digits, and there's your exponent.
22:57 offby1: The final result is (* (+ int fraction) (expt 10 exponent))
22:58 lightbulb: i agree with what your saying but i'm still having trouble interpreting this
22:58 lightbulb: i know this is a pain
22:58 lightbulb: and i apologize
22:58 lightbulb: but i'm new to racket
22:58 lightbulb: and the programming language world
23:00 lightbulb: when your saying discard
23:00 lightbulb: we can use substrings correct?
23:04 lightbulb: ?
23:06 jonrafkind: you should write two functions `mantissa' which gets the '1.42' part from '1.42x10^5' and another function 'magnitude' which gets the '10^5' part
23:06 jonrafkind: then just split apart the magnitude into '10' and '5', and call the power routine on it
23:09 lightbulb: what command is used to split
23:09 offby1: sure sure
23:10 offby1: you could write it yourself.
23:10 lightbulb: substring?
23:10 offby1: yep
23:10 offby1: the x10^ is always four characters long, so ...
23:11 lightbulb: this is really hard to understand
23:11 jonrafkind: MATH IS HARD LETS GO SHOPPING!
23:12 jonrafkind: lightbulb, how much programming experience do you have?
23:12 lightbulb: none
23:12 jonrafkind: and this is your first assignment????
23:12 lightbulb: yes sir
23:12 jonrafkind: is your teacher insane?
23:12 lightbulb: i guess so
23:12 lightbulb: like
23:12 lightbulb: this is what we're given
23:13 jonrafkind: well its unfortunate, but you're going to have to do a lot of self-learning I guess, you should read through htdp
23:13 jonrafkind: www.htdp.org
23:13 lightbulb: (define (sn->num sn-string sig-digits)
23:13 jonrafkind: and follow those exercise
23:13 lightbulb: thats what we're given to get us started
23:14 lightbulb: and how the hell do i answer this question with that information
23:14 lightbulb: !!
23:15 lightbulb: jondrafkind, can you help me through this question
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23:55 jonrafkind: whowhatnow
23:56 jonrafkind: another satisfied customer!