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2014-09-20T00:24:03Z Guest_: I didnt know Scheme was so popular... Hi I have to code in Scheme for school. Im trying to do an assignment, which shouldnt be too difficult. Can someone tell me why I am getting an error message?
2014-09-20T00:25:07Z Guest_: http://prntscr.com/4og5c3
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2014-09-20T00:35:48Z pyro-_: Guest_: looks like your scheme implementation has a function named min which it doesn't want you to override
2014-09-20T00:36:14Z Guest_: Its ok I dont need min
2014-09-20T00:36:26Z pyro-_: just choose a different variable name
2014-09-20T00:37:15Z Guest_: Its supposed to be seconds and minutes
2014-09-20T00:37:51Z pyro-_: better to call it seconds and minutes then
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2014-09-20T00:38:32Z Guest_: I used the variables mins and secs, but then there was no error message or answer XD
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2014-09-20T00:39:05Z pyro-_: well, you only have definitions there
2014-09-20T00:39:26Z Guest_: (define au 93000000000)  (define c 186000)  (define sec (/ au c))  (/ sec 60) I got this
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2014-09-20T00:51:19Z Guest_: I am trying to solve a quadratic equation using scheme, another one of my assignments. The equation is a X^2 - 6X + 13 = 0. I wrote (define q_equation (+ (expt x 2) (* x -6) 13)) (define q_equation 0) (+ x 0) but the problem is, x isnt defined.
2014-09-20T00:52:12Z vanila: (define (q_equation x) ...) to make it a function of x
2014-09-20T00:55:51Z Guest_: How can I say (+ (expt x 2) (* x -6) 13)) equals 0
2014-09-20T00:56:20Z vanila: Guest_, scheme the programming language can't do things like solving equations
2014-09-20T00:56:57Z vanila: Gerald Sussman wrote a library that lets you do this but in normal scheme you'd need to program the quadratic formula sqrt(b^2-4ac) stuff by hand
2014-09-20T00:58:33Z Guest_: http://bert.stuy.edu/pbrooks/fall2014/materials/intro/scheme_homework_1.html question 4
2014-09-20T00:58:34Z rudybot: http://tinyurl.com/mnptaev
2014-09-20T00:59:19Z vanila: Guest_, why not write a function (define (solve-quadratic-equation a b c) ...)
2014-09-20T00:59:45Z vanila: then you can test it like this (q_equation (solve-quadratic-equation 2 -6 13)) and ti shoudl give 0
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2014-09-20T01:00:28Z Guest_: Im givin the equation and Im supposed to find the solutions
2014-09-20T01:00:32Z Guest_: The 2 values of x
2014-09-20T01:00:40Z Guest_: * given
2014-09-20T01:01:21Z vanila: are you familair with the quadratic formula? http://tothereal.files.wordpress.com/2013/05/quadratic-formula.jpg
2014-09-20T01:01:52Z Guest_: Oh thanks
2014-09-20T01:01:57Z Guest_: Forgot about that
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2014-09-20T01:34:07Z zacts: vanila: x = [ -b +- sqrt( b^2 - 4ac ) ] / 2a
2014-09-20T01:34:33Z vanila: thanks zacts
2014-09-20T01:34:48Z zacts: when 0 = ax^2 + bx + c
2014-09-20T01:34:51Z zacts: =)
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2014-09-20T01:45:33Z Guest_: I dont know what I did wrong. Im trying to solve the quadratic equation x^2 - 6x + 13 = 0. http://prntscr.com/4ogpx8
2014-09-20T01:45:49Z Guest_: I have a lot of variables, but the code should be correct...
2014-09-20T01:46:38Z vanila: is 3+2i wrong?
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2014-09-20T01:51:17Z Guest_: I dont know...
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2014-09-20T01:51:37Z vanila: why don't you test it
2014-09-20T01:51:47Z vanila: (define (q_equation x) (+ (expt x 2) (* x -6) 13))
2014-09-20T01:51:54Z vanila: an dsee if (q_equation 3+2i) is 0
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2014-09-20T02:03:28Z jusss: d
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2014-09-20T03:16:53Z P4Titan: How do I pass the return of (values a b c) into a function?
2014-09-20T03:20:14Z vanila: MULTIPLE-VALUE-BIND perhaps
2014-09-20T03:20:39Z P4Titan: could you please give me an example
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2014-09-20T03:37:17Z pjb: vanila: this is #scheme, here it's call-with-values
2014-09-20T03:37:42Z pjb: minion: memo for P4Titan: just read about call-with-values in http://www.schemers.org/Documents/Standards/R5RS/HTML/
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2014-09-20T05:18:56Z vanila: http://repository.readscheme.org/ftp/papers/orbit-thesis.pdf
2014-09-20T05:19:14Z vanila: im reading this but i dont fully understand 4.2 ecsape analysis on page 37
2014-09-20T05:19:44Z vanila: "I procedure is said to /escape/ if the compiler cannot identify all the places where the procedure is being called."
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2014-09-20T05:36:40Z ijp: okay
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2014-09-20T08:33:13Z vanila: is there any way to do modules in chicken scheme without having the entire file indented?
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2014-09-20T09:39:21Z taylanub: in R7RS-small I just use `include' to include the library body so the whole thing isn't intended, plus you can include it from other types of module/library declaration syntaxes to make modules/libs for many Scheme implementations.  R6RS is notoriously lacking an `include' and the proposed syntax-case using implementation doesn't necessarily handle issues with the working directory vs. the
2014-09-20T09:39:22Z taylanub: directory of the file being evaled so ... R7RS-small library syntax is surprisingly more useful -_-
2014-09-20T09:39:33Z taylanub: s/intended/indented/
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2014-09-20T10:14:56Z ijp: or you could just not indent the body
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2014-09-20T10:28:03Z taylanub: someone will have to teach Emacs to do that
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2014-09-20T10:30:03Z taylanub: why's there no call-with-(input|output)-string and with-(input-from|output-to)-string in R7RS and instead only open-(input|output)-string and get-output-string -_-
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2014-09-20T10:30:05Z taylanub: same for bytevectors
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2014-09-20T12:28:37Z lrs_: How do i create multiplication by only using this : http://pastebin.com/hTWYMenk
2014-09-20T12:30:51Z pjb: lrs_: you need to use more than only those two functions, but a*b = a+a+a…+a (b times).
2014-09-20T12:31:05Z pjb: and a+b = (a+1)+(b-1) and a+0 = a
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2014-09-20T12:32:20Z lrs_: pjb: I got this
2014-09-20T12:33:45Z lrs_: pjb http://pastebin.com/GQGbdjza
2014-09-20T12:33:55Z lrs_: And im assuming im gonna rename it
2014-09-20T12:34:03Z lrs_: And change something in the recursive thing
2014-09-20T12:34:20Z pjb: better  (plus (pred a) (succ b))
2014-09-20T12:34:54Z lrs_: Hmm?
2014-09-20T12:35:15Z pjb: So now you have plus, you cam write mult.  a*0 = 0,  a*1 = a, a*b = a*(1+(b-1)) = a*1+a*(b-1)
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2014-09-20T12:36:13Z pjb: lrs_: with (plus (pred a) (succ b)) plus is a terminal call, so TCO can be performed.  Otherwise, you will use O(b) stack space.
2014-09-20T12:37:17Z lrs_: Im not really sure what that means
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2014-09-20T12:38:04Z pjb: trace plus and succ.
2014-09-20T12:40:05Z lrs_: I did
2014-09-20T12:40:21Z lrs_: >(plus 0 3)
2014-09-20T12:40:23Z lrs_: <3
2014-09-20T12:40:23Z lrs_: 3
2014-09-20T12:41:12Z pjb: http://paste.lisp.org/+32YA
2014-09-20T12:41:30Z pjb: plus1 must use the stack to remember it has to call succ at the end.
2014-09-20T12:41:58Z pjb: plus2 can call succ and pred immediately, and can iterate without using the stack, instead of perform a recursive call.
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2014-09-20T12:51:45Z lrs_: pjb, Whats a stack?
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2014-09-20T12:54:30Z pjb: A stack is a data structure that has the following operations: new-stack, push, pop such as: (empty-stack) --> stack ; (push e stack) -> stack' ; (pop (push e stack)) == e
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2014-09-20T12:56:46Z pjb: When a function f calls a function g, it saves on the stack all its local state, and it pushes the arguments to the function g.  This allows for recursive calls: when g calls f, it pushes its own state and the arguments to f on the stack, etc.
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2014-09-20T12:57:33Z lrs_: All the local states of the function g?
2014-09-20T12:57:37Z pjb: Yes.
2014-09-20T12:57:58Z lrs_: This stuff is kind of hard to visualize
2014-09-20T12:58:04Z lrs_: I just started this course
2014-09-20T12:58:25Z pjb: Actually it's very easy. https://www.google.com/search?q=function+call+stack&newwindow=1&safe=off&client=iceweasel-a&rls=org.mozilla:en-US:unofficial&tbm=isch&tbo=u&source=univ&sa=X&ei=5XkdVNiHNYraasXmgpgE&ved=0CC4QsAQ&biw=880&bih=855
2014-09-20T12:58:25Z rudybot: http://tinyurl.com/krxuc4t
2014-09-20T12:58:50Z pjb: http://www.installsetupconfig.com/win32programming/processtoolhelpapis12_files/winprocesstoolhelpapiscode003.png
2014-09-20T12:58:50Z rudybot: http://tinyurl.com/lj7ys2c
2014-09-20T12:59:21Z pjb: It's all good, until you start to have very deep recursions.
2014-09-20T12:59:40Z pjb: Each thread has its own stack, usually of relatively limited space (about 1 or 2 MB).
2014-09-20T13:00:16Z pjb: Since the stack may contain pointers, it's hard to move it in the memory, so it is difficult to extend it beyond the pre-allocated limit.
2014-09-20T13:01:05Z pjb: Therefore when you have deep recursions, you can easily reach the limit for the stack space, and get out-of-stack-space errors (or in general, SIGSEGV).
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2014-09-20T13:03:41Z pjb: So if the function f calls the function g as the last thing it does, that is, when the call to g is a tail call, the space used on the stack by the function f is not needed anymore.  And there's no need to save the state of f, since calling g is the last thing it does, and when g returns, f will returns immediately too.
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2014-09-20T13:04:42Z pjb: Therefore tail calls can be optimized, by poping the space used by the current function from the stack, pushin the arguments, and _jumping_ to g, instead of calling it.
2014-09-20T13:05:13Z pjb: If g = f, then pushing the arguments = assign the new values to the arguments, and jumping is a loop.
2014-09-20T13:05:30Z pjb: So recursive tail calls can be implemented as a mere iteration.
2014-09-20T13:05:38Z pjb: Without using stack space.
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2014-09-20T16:08:39Z CaptainRant: Why is start-thread! postfixed with a ! ? Does it mutate the state more than io functions ?
2014-09-20T16:08:59Z CaptainRant: Or only because other threads might use set! on global identifier ?
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2014-09-20T17:19:16Z taylanub: CaptainRant: there is not standard procedure `start-thread!'.  Starting a thread can be seen as mutating global state though
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2014-09-20T17:32:44Z taylanub: hm, it would be really neat if those SRFIs for which it's possible would get R7RS-small implementations
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2014-09-20T17:57:47Z lrs_: http://pastebin.com/pVL3zYNL I need to define this function for creating a function that does a factorial of a number by using pred
2014-09-20T17:57:57Z lrs_: But when I replace - n 1 with pred it doesnt work... Why?
2014-09-20T17:58:16Z vanila: replace (- n 1) with (pred n) ?
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2014-09-20T18:01:38Z vanila: https://www.youtube.com/watch?v=RG9fBbQrVOMa
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2014-09-20T18:13:39Z rudybot: la la la
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2014-09-20T19:34:41Z rudybot: la la la
2014-09-20T19:35:37Z ilammy: gununu
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2014-09-20T19:44:10Z rudybot: la la la
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2014-09-20T20:39:42Z rudybot: la la la
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2014-09-20T20:46:00Z atomikkk: wow sicp is cool sofar, I feel smarter just reading it
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2014-09-20T21:13:21Z CaptainRant: Is there a better scheme syntax file for Vim ? Some correct identifier are highlighted as errors, and indention works not always.
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2014-09-20T21:13:34Z rudybot: la la la
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2014-09-20T21:29:16Z van-rijn: scheme mode in vim?
2014-09-20T21:29:23Z van-rijn: I think it works well..
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2014-09-20T21:38:28Z van-rijn: http://endthefed.livejournal.com/
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2014-09-20T23:07:15Z ijp: lol, gavino has a livejournal
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2014-09-20T23:09:52Z c107: ijp:  What's funny about that?
2014-09-20T23:10:59Z ijp: it's just really apt
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2014-09-20T23:20:25Z c107: ijp: apt sucks
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2014-09-20T23:21:32Z rudybot: la la la
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2014-09-20T23:29:56Z c107: ,(+ 1 11)
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