00:00 Lajla: franki^, don't prime factor much?
00:01 franki^: Unfortunately not, although it might make it onto my New Year's resolutions
00:02 Lajla: franki^, it's lot's of fun.
00:02 Lajla: franki^, prime factor 2!
00:02 Lajla: You can do it.
00:05 franki^: I'll do it once Racket finishes compiling, I wouldn't want to overheat my laptop ;)
00:11 Lajla: in racket?
00:21 franki^: I guess, but, hrnnn, something seems to have gone terribly wrong. Although I saw no errors, or even warnings, whilst compiling, drracket starts with an odd-shaped window and all of the menus are blank...
00:22 franki^: Unfortunately it's a bit late for me to worry about it now, with work in the morning and all that...
00:22 franki^: I'll try again on the weekend or something
00:22 franki^ wanders off
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04:42 Lajla calls offby1 with the current continuation
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08:36 kghost: Hi, I found racket's unfold-right is different from srfi-1's unfold-right
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12:22 Waldteufel: hey :D
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15:42 Bob_: hi everyone
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16:24 Bob_: plox
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16:40 shofetim: /?
16:58 rapacity: it's a trick
17:15 askhader: does (let ) contain an implicit begin?
17:16 jonrafkind: yes
17:16 askhader: Thought so, thanks
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19:31 Lajla: Hmm
19:31 Lajla: how exactly does the number->string procedure work for inexact numbers
19:32 Lajla: Because I've got no idea how to implement such a function without having access to the bitvector that makes up the float. (and even then I would have to study the float standard a bit better)
19:33 Lajla: jonrafkind, you will be my saviour for this one.
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19:45 Quetzalcoatl_: Lajla: For inexact numbers, number->string uses C's sprintf function.
19:47 Lajla: Isn't it a library function?
19:48 Quetzalcoatl_: It's written in C.
19:48 Lajla: Or is there a way to make it one?
19:48 Lajla: Like, can I make a my-number->string function in racket alone?
19:51 Quetzalcoatl_: (define (my-number->string n) (format "~a" n))
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20:15 Lajla: Ehhh
20:15 Lajla: maybe I was a bit unclear.
20:15 Lajla: I want an algorithm that can get the digits from a float.
20:15 Lajla: Or basically
20:15 Lajla: From what racket or scheme exposes from them
20:19 Quetzalcoatl_: The best starting point I can think of for that would be to use the floor function.
20:19 Quetzalcoatl_: But the solution forming in my head doesn't handle exponential notation.
20:20 Quetzalcoatl_: To get at the bits that make up a float, you really have to use C.
20:20 Quetzalcoatl_: Or assembly language.
20:21 Quetzalcoatl_: You could write a C function that simply returns its float argument as an int, using type punning. Then Racket's bitwise operators would work.
20:24 jonrafkind: wohat
20:26 jonrafkind: Lajla, theres a paper by clinger that described how to print real numbers
20:26 jonrafkind: actually i think the paper was by steele
20:26 jonrafkind: clinger did the 'how to read iee numbers' or something
20:32 Quetzalcoatl_: I've got the paper. It assumes you have the binary representation of the float to start with.
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20:35 Quetzalcoatl_: Lajla's problem was that Racket doesn't give you access to the bits that make up an inexact.
20:39 Quetzalcoatl_: The solution to _that_ problem is a C function that returns a number whose bits Racket _can_ manipulate-- an integer with the same bit pattern as the float.
20:42 jonrafkind: well, that presumes a great deal about how racket stores floats
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20:49 Lajla: So like
20:49 Lajla: this is advanced?
20:49 Lajla: Good, I was feeling stupid.
20:49 Lajla: But yeah
20:49 Lajla: I guess floor is a good start
20:49 Lajla: Basically divide by base, floro again et cetera until you reach the epsilon
20:56 Quetzalcoatl_: I looked at the source. Racket stores floats as C doubles.
20:56 Lajla: As to be expected
20:57 Lajla: It'smore like
20:57 Lajla: scheme deosn  even have floats right?
20:57 Lajla: It has 'inexact numbers'
20:57 Lajla: With the dire understanding that any implementation will float them.
20:57 Lajla: But it's more that I want to print them with R5RS alone I think
20:57 Lajla: But I got a good idea if I can use floor
21:08 Quetzalcoatl_: Lajla: Don't forget to handle infinity.
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