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2015-04-14T12:07:35Z kephra: http://kephra.de/o3proto/visitors.html <- back on IO ... take a look at the HTML source, and the o3lib.scm ... read/write are slow, because the service at port 8080 is my desktop on a VPN, not a real server
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2015-04-14T12:13:50Z kephra: I wonder, if adding set-current-output-port! and set-current-input-port! primitive forms is a good way to implement with-input/output-to/from-file
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2015-04-14T12:22:26Z kephra: and for those who read the code - a small change to with-output-to-file, its usage and one more question
2015-04-14T12:22:59Z kephra: " With-input-from-file and with-output-to-file return the value yielded by thunk. " <- r4rs
2015-04-14T12:24:58Z kephra: now write returns an unspecified value - so the lambda that is using write, can not do it as tail, but I added a #t there.
2015-04-14T12:25:07Z kephra: Is this a common/right way?
2015-04-14T12:25:19Z Riastradh: Nothing's wrong with returning whatever WRITE returns.
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2015-04-14T12:28:14Z kephra: that the question if my implementation is wrong here - write currently returns nothing - so let fails its binding
2015-04-14T12:28:59Z Riastradh: If you have a notion of multiple return values, WITH-INPUT-FROM-FILE should return whatever values the thunk returns.
2015-04-14T12:29:46Z kephra: it might be that I just interpreted the "write returns an unspecified value." and related totally wrong, in returning nothing to the return stack
2015-04-14T12:30:15Z Riastradh: If you don't have a notion of multiple return values, then WRITE needs to return something, and WITH-INPUT-FROM-FILE should return that something too without difficulty.
2015-04-14T12:31:43Z taylanub: isn't returning zero values standard-nonconformant if the standard says "an unspecified value is returned," since that implies one value being returned? (as much as I'd like such things to all return zero values...)
2015-04-14T12:32:39Z kephra: yes, thats the question - whats an unspecified value?
2015-04-14T12:32:54Z Riastradh: Any value you like. The standard doesn't specify it. It's up to you to choose.
2015-04-14T12:33:10Z mario-goulart: If you could specify it, it wouldn't be unspecified!
2015-04-14T12:33:16Z Riastradh: You can return 3, or #f, or the string "I want to perform cranial activities with Tuesday Weld!!".
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2015-04-14T12:33:29Z kephra: Riastradh, ++
2015-04-14T12:33:56Z kephra: well - this small demo showed a deeper problem in my implemenation ... back to coding
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2015-04-14T13:12:51Z kephra: *ok* all functions now return something
2015-04-14T13:13:08Z kephra: some special forms delegate returning to later
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2015-04-14T13:29:46Z technomancy: cranial activities: great activities or greatest activities?
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2015-04-14T18:50:27Z BW^-: ok here's the evening's math problem: i need to implemement a CEILING function |myceiling|.
2015-04-14T18:50:39Z BW^-: |myceiling| takes one input argument, let's call it |i|.
2015-04-14T18:51:12Z BW^-: |i| is an arbitrary fractional e.g. 1, #e0.0005 , #e1.25 , #e7000.25 etc.
2015-04-14T18:51:55Z BW^-: i.e. those examples correspond to 1 1/2000 5/4 28001/4
2015-04-14T18:52:41Z BW^-: i want |myceiling| to be such, that its return value, let's call it |o|, is |i| mangled to FIVE significant decimals, and ceilinged at that level.
2015-04-14T18:53:05Z BW^-: so, examples would be:
2015-04-14T18:53:15Z BW^-: (myceiling #e0.0123456) => #e0.012345
2015-04-14T18:53:55Z BW^-: (myceiling #e0.8888888888) => #e0.88889
2015-04-14T18:54:13Z BW^-: (myceiling 12345678) => 12346000
2015-04-14T18:54:42Z BW^-: how would you implement this?
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2015-04-14T18:57:43Z ijp: what have you tried so far?
2015-04-14T18:58:10Z BW^-: ijp: nothing
2015-04-14T18:58:15Z BW^-: !
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2015-04-14T18:58:28Z BW^-: ijp: hmm.. this is pretty close I guess http://stackoverflow.com/questions/202302/rounding-to-an-arbitrary-number-of-significant-digits
2015-04-14T18:58:29Z rudybot: http://tinyurl.com/k2euo5f
2015-04-14T18:58:35Z BW^-: ijp: thoughts?
2015-04-14T18:59:05Z ijp: sounds homeworky
2015-04-14T18:59:27Z BW^-: ijp: this is not homework
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2015-04-14T18:59:51Z BW^-: and ig uess you should know
2015-04-14T18:59:56Z BW^-: anyhow
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2015-04-14T19:00:08Z BW^-: perhaps the stackoverflow article answers it all... lessee!
2015-04-14T19:01:35Z ijp: suppose you the procedure only needed to work for six digit numbers e.g. 123456, how would you solve it?
2015-04-14T19:02:14Z ijp: is there a way you can use the existing ceiling function to handle it?
2015-04-14T19:02:47Z pjb: yes, make it harder before making it easy.
2015-04-14T19:03:07Z BW^-: ijp,pjb: wait, is there a log10 function in Scheme?
2015-04-14T19:03:22Z ijp: no / kind of
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2015-04-14T19:03:29Z BW^-: ijp: how?
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2015-04-14T19:04:05Z ijp: in r6rs, you can do (log foo 10), but in r5rs, you need to do the change of base
2015-04-14T19:04:31Z BW^-: ijp: ouha.. how?
2015-04-14T19:04:40Z ijp: the same way you were taught in highschool
2015-04-14T19:05:15Z BW^-: (define (log10 n) (/ (log n) (log 10)))
2015-04-14T19:05:16Z BW^-: aha
2015-04-14T19:05:37Z BW^-: ijp,pjb: back to if "is there a way you can use the existing ceiling function to handle it" - yes!
2015-04-14T19:05:47Z pjb: Great! Of course, there is.
2015-04-14T19:05:50Z BW^-: when the number is normalized to integer, then ceiling works
2015-04-14T19:06:10Z BW^-: normalized as in.. the five significant digits are located before the decimal dot, and the rest after it
2015-04-14T19:06:31Z BW^-: then just ordinary |ceiling| is fine
2015-04-14T19:06:59Z pjb: So how do you write (ceiling5 x)?
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2015-04-14T19:07:42Z BW^-: pjb: right, so i guess first i "normalize" the input value to having the five significant digits to the left of the decimal dot..
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2015-04-14T19:07:53Z BW^-: pjb: then I do the ordinary Scheme |ceiling| on it..
2015-04-14T19:07:59Z BW^-: pjb: and then I denormalize it
2015-04-14T19:08:01Z BW^-: sounds like a plan?
2015-04-14T19:08:03Z pjb: Yes.
2015-04-14T19:08:50Z BW^-: pjb,ijp: great!! ok thanks to the log10 and stackoverflow article, i believe i can probably solve it now.
2015-04-14T19:08:52Z BW^-: lessee. :)
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2015-04-14T19:33:57Z BW^-: pjb,ijp: solved :D
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2015-04-14T19:38:00Z BW^-: pjb,ijp: I don't like that Scheme's |log| returns a flonum instead of an exact.. couldn't that possibly give rise to bugs?
2015-04-14T19:39:01Z BW^-: pjb,ijp: compare rows 29-32 here: https://pastebin.mozilla.org/8830057
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2015-04-14T19:42:14Z BW^-: ok audited the particular interval used and it looks solid I think
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2015-04-14T19:49:08Z BW^-: pjb,ijp: so all resolved, thank you very much for your help and sharing your thoughts!
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2015-04-14T23:49:56Z cmhobbs: does anyone know if an acm membership will be required to attend the 2015 scheme workshop and does anyone know what registration cost might be?
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