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2014-10-26T02:18:29Z cutgovspend: vot republican
2014-10-26T02:18:31Z cutgovspend: I do
2014-10-26T02:18:40Z vanila: that's offtopic
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2014-10-26T02:20:59Z cutgovspend: true
2014-10-26T02:21:13Z cutgovspend: vanila: how old are u
2014-10-26T02:21:23Z vanila: 25
2014-10-26T02:21:33Z cutgovspend: democrat?
2014-10-26T02:21:42Z cbsw joined #scheme
2014-10-26T02:22:00Z cutgovspend: married?
2014-10-26T02:25:12Z cutgovspend: well
2014-10-26T02:25:22Z cutgovspend: my advice is go out to a hallween party
2014-10-26T02:25:24Z cutgovspend: get some action
2014-10-26T02:25:30Z cutgovspend: its saturday night!!!
2014-10-26T02:25:33Z cutgovspend: you  know I am
2014-10-26T02:25:36Z cutgovspend: im suiting up now!!
2014-10-26T02:25:39Z cutgovspend: aw yeah!!!
2014-10-26T02:25:48Z cojy: what is your costume
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2014-10-26T02:26:04Z vanila: sexy ebola nurse
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2014-10-26T14:07:03Z taylanub: I'm frustrated.  SRFI-2 is really hard to implement with syntax-rules.
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2014-10-26T14:19:40Z taylanub: I'm frustrated again.  The HTML page http://srfi.schemers.org/srfi-3/srfi-3.html seems broken and the reference implementation link gives me some source that has a comment saying I'm looking at an obsolete draft version.  WTF?
2014-10-26T14:20:38Z taylanub: the page looks like someone didn't manage to resolve some merge conflicts? :\
2014-10-26T14:21:03Z taylanub: oh wait, SRFI-3 is withdrawn.  move on.
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2014-10-26T14:48:02Z jffmcc: Hi. Please point out the error: http://pastebin.com/JbtSVb3V The code is supposed to test whether the elements in a list are equal
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2014-10-26T14:55:27Z taylanub: jffmcc: homework?
2014-10-26T14:55:37Z jffmcc: Yeah
2014-10-26T14:55:50Z taylanub: otherwise (apply equal? l) and be done with it :P
2014-10-26T14:56:15Z jffmcc: Oh XD Thanks
2014-10-26T14:56:41Z jffmcc: I keep forgetting to use equal? for lists
2014-10-26T14:57:20Z taylanub: .oO( indeed, I guess (equal? l) is the same as (apply equal? l). )
2014-10-26T14:57:46Z ecraven: (equal? l) is an arity error
2014-10-26T14:57:58Z taylanub: er .. my brain is fried
2014-10-26T14:58:43Z jffmcc: Still got an error: . . mcar: contract violation   expected: mpair?   given: ()
2014-10-26T14:58:53Z taylanub: jffmcc: from what code?
2014-10-26T14:59:02Z jffmcc: Lines 2-3
2014-10-26T14:59:09Z jffmcc: http://pastebin.com/JbtSVb3V
2014-10-26T15:00:47Z jffmcc: Wait a sec. I will be right back. Need to restart my computer
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2014-10-26T15:08:03Z jffmcc: Alright any thoughts?
2014-10-26T15:09:04Z ecraven: jffmcc: yes
2014-10-26T15:09:14Z ecraven: jffmcc: think about what you are doing here, and in which order the cond clauses are checked
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2014-10-26T15:09:26Z ecraven: what does the first check do?
2014-10-26T15:09:56Z ecraven: or alternatively, what does (allequal? '()) do? what does (allequal? '(1)) do?
2014-10-26T15:09:59Z jffmcc: Checks if the length of the list is 2, and if it is, it checks if the first and last elements of that list are euqla
2014-10-26T15:10:01Z jffmcc: * equal
2014-10-26T15:10:26Z jffmcc: (allequal? '(1)) gives and error
2014-10-26T15:10:31Z ecraven: why?
2014-10-26T15:10:49Z jffmcc: Oh its given that allequal? is a function that is given a list of at least 2 elementrs
2014-10-26T15:10:53Z jffmcc: * elements
2014-10-26T15:11:01Z jffmcc: So I dont need to worry about that
2014-10-26T15:11:30Z jffmcc: ^^^^ * an
2014-10-26T15:14:54Z jffmcc: ecraven?
2014-10-26T15:17:25Z ecraven: you do, because you call (cdr l), so it will then be a shorter list
2014-10-26T15:19:37Z jffmcc: Oh I see. Thanks!
2014-10-26T15:19:54Z jffmcc: So, cdr l if length is greater than 2
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2014-10-26T15:21:57Z ecraven: well, the problem is, the order of your cond clauses seems wrong, your second clause assumes there is a car and a cdr, even though you never check for it (it might go to the second clause because the length is not 2 or because car and cadr aren't equal)
2014-10-26T15:22:15Z ecraven: personally, i'd write it so that it first checks the length (in increasing order), then does something
2014-10-26T15:31:08Z jffmcc: Ok I dont get an error now, but I get a #f for a true stateent
2014-10-26T15:31:16Z jffmcc: * #f when it is true
2014-10-26T15:31:23Z ecraven: paste your code on pastebin
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2014-10-26T15:32:07Z jffmcc: Wait, I dont want to rely too much. I'll try to think it out a bit
2014-10-26T15:35:54Z jffmcc: For cond, if a clause is true, it stops evaluating the code or keeps going?
2014-10-26T15:43:30Z jffmcc: encraven, I still get #f no matter what I do
2014-10-26T15:44:45Z jffmcc: http://pastebin.com/y54vV1bw -> I tried using if
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2014-10-26T15:56:44Z taylanub: hmm, so there's ##lisp for talk about lisp in general.  (not like #lisp which is about CL.)  not many people there though.  I hope it'll grow.
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2014-10-26T15:57:38Z jffmcc: taylanub, seems like ecraven is afk
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2014-10-26T15:58:09Z jffmcc: Could you help me out? http://pastebin.com/y54vV1bw I get #f for both of the tests... Dont know whats wrong
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2014-10-26T15:58:55Z taylanub: jffmcc: tip: if you use a literal #t or #f somewhere, there's a good chance your code isn't in typical scheme style.  usually you just let the truthiness or falseness come from somewhere.
2014-10-26T15:59:50Z taylanub: for example (if (something) #t #f) is the same as just (something), except in the former case you're forcing it to return #t when normally it could return some more meaningful value (all values except #f count as true)
2014-10-26T16:01:30Z jffmcc: So how would I make it return #t if the clause is true and #f if its not?
2014-10-26T16:01:55Z taylanub: do you *have* to make it return #t?  if so, fine I guess.
2014-10-26T16:02:21Z jffmcc: I have to make it return #t if the clause is true
2014-10-26T16:03:08Z taylanub: well, in this case, = and equal? already return #t, so you can strip off the (if ... #t f), and it will still be sure to return #t or #f
2014-10-26T16:03:31Z fizzie: (equal? (car l) (allequal? ...)) is rather unlikely to be correct, though.
2014-10-26T16:04:51Z fizzie: (Given that l contains numbers and allequal?, as was just established, returns either #t or #f.)
2014-10-26T16:06:18Z jffmcc: The elements can be letters
2014-10-26T16:06:33Z jffmcc: I just used numbers for the test...
2014-10-26T16:06:34Z fizzie: Even if they're letters, they won't be equal to #t or #f.
2014-10-26T16:06:57Z jffmcc: Alright Ill try rewriting the code from scratch
2014-10-26T16:07:00Z fizzie: You're comparing (car l) and the result of (allequal? (cdr l)) there. Those are not going to be the same thing.
2014-10-26T16:07:12Z fizzie: (Unless the list is full of #t's or #f's, I guess.)
2014-10-26T16:07:32Z jffmcc is busy writing the new code
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2014-10-26T16:11:18Z taylanub: jffmcc: another tip: try to write your procedure in such a way that it will "walk through" the list, carrying values with it, instead of diving down, getting values, and carrying them back up.  here's an example that might convey the idea: http://sprunge.us/UHdM  (both implementations are otherwise pretty stupid, but they showcase the contrast between the methods)
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2014-10-26T16:48:20Z taylanub notices one can use e.g. (let ((x #f)) #f) as sort of an (identifier? x) guard in macros.
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2014-10-26T16:51:08Z taylanub: grrrrrrrrrr, who let SRFI-2 pass
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2014-10-26T16:55:13Z taylanub: even let* allows the same identifier to be bound multiple times.  the test-suite in the and-let* reference implementation mark it as a syntax error
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2014-10-26T17:00:58Z taylanub: ah, up to and including in R5RS it was vague whether let* allows the same variable to reappear, and apparently the SRFI-2 author interpreted it as being invalid and followed that.  R6 and 7RS explicitly allow it.  Guile's SRFI-2 implementation also allows it.  mine will too then; I doubt many programs rely on this historical bug.
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2014-10-26T17:15:01Z taylanub: Racket's and Chicken's implementations allow it too so the deal is sealed.
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2014-10-26T20:07:05Z s41t: Hello. How would I create a function that counts the number of zeros at the end of a number? Ex: 0 -> 1; 100 -> 2; 5 -> 0
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2014-10-26T20:08:42Z ijp: s41t: when does a decimal have a zero at the end of the number?
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2014-10-26T20:11:14Z s41t: ijp, the number must be a whole number. Sorry for the inconvenience.
2014-10-26T20:11:37Z ijp: okay, but which whole numbers
2014-10-26T20:12:02Z s41t: ijp, any. Recursion must be used.
2014-10-26T20:12:17Z ijp: 5 does not have a 0 at the end
2014-10-26T20:12:26Z ijp: so it can't be *any* whole number
2014-10-26T20:13:36Z s41t: [16:06] <s41t> Hello. How would I create a function that counts the number of zeros at the end of a number? -> Please notice the word "counts". 5 does not have a 0 at the end, as you pointed out. Therefore, (function 5) should give 0.
2014-10-26T20:14:25Z ijp: I read your question, but you haven't read mine
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2014-10-26T20:16:33Z s41t: ijp, I believe I answered your question. The number given does not have to have a 0 at the end.
2014-10-26T20:17:14Z ijp: s41t: can you give a rule for "has a zero at the end" that works for any whole number?
2014-10-26T20:17:18Z pjdelport: s41t: Do you know how to extract digits using division and modulus?
2014-10-26T20:17:34Z ijp: focus on the case with one, then iterate
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2014-10-26T20:18:22Z s41t: pjdelport, meaning quotient and modulo?
2014-10-26T20:18:35Z pjdelport: s41t: Right, yes.
2014-10-26T20:18:45Z s41t: ijp, 100 is a whole number that has a zero at the end.
2014-10-26T20:19:13Z ijp: s41t: what's the rule?
2014-10-26T20:19:48Z ijp: you would have learned it round about age 5 or 6
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2014-10-26T20:20:24Z s41t: pjdelport, meaning if the modulo of the number and 10 is 1, 2, 3, 4, 5, 6, 7, 8, or 9, the answer is 0?
2014-10-26T20:20:46Z pjdelport: s41t: Well, i just mean digit extraction in general.
2014-10-26T20:20:53Z upinthemorning: s41t: think of the prime factors a number must have in order for it to end in a 0.
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2014-10-26T20:21:10Z upinthemorning: 10 = 2*5
2014-10-26T20:21:17Z ijp: prime is a red herring
2014-10-26T20:21:21Z upinthemorning: 100 = 2**2 * 5**2
2014-10-26T20:21:22Z pjdelport: s41t: There are basically two components to this problem: the first is the problem of extracting the decimal digits from a number.
2014-10-26T20:21:44Z pjdelport: And the second is counting how many of the extracted lower-order digits are zero.
2014-10-26T20:21:51Z upinthemorning: ijp: I think just counting the number of factors of 5 a number has will work, no?
2014-10-26T20:22:15Z pjdelport: s41t: So, as a first step, towards solving this problem, can you write a function that converts a number to a list of its decimal digits?
2014-10-26T20:22:22Z ijp: upinthemorning: the rule I was hoping s41t would say is "a number has a 0 at the end, if it is divisible by 10"
2014-10-26T20:23:10Z upinthemorning: ijp: ah yes. I was just thinking of basically the same rule but with 10 = 2*5.
2014-10-26T20:23:28Z s41t: pjdelport, Sorry. I dont understand. The number given must be a whole number. There are no decimal digits.
2014-10-26T20:23:45Z pjdelport: s41t: I don't mean fractional digits.
2014-10-26T20:23:46Z upinthemorning: ijp: so you count the number of prime factor pairs (2, 5).... i.e., as you said, count the number of factors of 10.
2014-10-26T20:23:53Z pjdelport: s41t: I mean the base-10 digits of the whole number :)
2014-10-26T20:24:01Z upinthemorning: s41t: he means an integer in base 10.
2014-10-26T20:24:13Z upinthemorning: pjdelport: yeah, sorry.
2014-10-26T20:24:25Z ijp: upinthemorning: but you can just test for divisibility of 10 straight away, without decomposing into factors
2014-10-26T20:24:28Z s41t: So, 5 would be 1 digit?
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2014-10-26T20:24:46Z upinthemorning: ijp: Yeah, that is obviously the better way. I was massively over-thinking it.
2014-10-26T20:24:47Z ijp: and loop, counting the times you can divide
2014-10-26T20:25:37Z pjdelport: s41t: Right; 123 would be 3 digits, and so on
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2014-10-26T21:21:44Z sorressean: I want to try to make a scheme mud just for... fun. Is there a way with scheme (chicken scheme preferably() to define a sort of structure to hold player information?
2014-10-26T21:21:58Z vanila: sorressean, you could use define-record
2014-10-26T21:22:12Z vanila: check it out http://wiki.call-cc.org/eggref/4/records
2014-10-26T21:22:15Z sorressean: vanila:  awesome, thanks a lot.
2014-10-26T21:22:26Z vanila: it'snot part of standard scheme so you need (require-extension records)
2014-10-26T21:22:41Z sorressean: sweet. I'll look it up.
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2014-10-26T21:26:12Z sorressean: ah, I need to install this somehow.
2014-10-26T21:26:38Z cojy: chicken-install records
2014-10-26T21:26:43Z vanila: chicken-install might work, although shouldn't there be a built in record system?
2014-10-26T21:26:46Z vanila: maybe ask #chicken
2014-10-26T21:27:04Z cojy: yea i think it should be build in
2014-10-26T21:27:22Z cojy: http://wiki.call-cc.org/man/4/Non-standard%20macros%20and%20special%20forms#record-structures
2014-10-26T21:27:23Z rudybot: http://tinyurl.com/m9msbjb
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2014-10-26T21:29:40Z sorressean: should I use this instead? I'm sorry, I am 100% new to scheme. I know some tiny bit of ilsp and figured I'd give this a try.
2014-10-26T21:31:32Z vanila: yeah sorry for being confusing
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2014-10-26T21:31:38Z vanila: that define-record cojy linked is what I meant earlier
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2014-10-26T21:51:06Z taylanub: TIL R7RS library declarations are basically SRFI-7
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2014-10-26T21:59:32Z taylanub: https://gitorious.org/taylan-scheme/srfi/  6 implemented, <70 to go!  (some get dropped because they must be implemented on the platform, or R7RS subsumed them.)  that's like 1/10 progress, but without test-suites.
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2014-10-26T22:27:23Z sorressean: ah sweet, that works then. thanks.
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