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<
bremner >
ugh. The racket 7.9 tarball really ships a git repository? is that on purpose?
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<
bremner >
src/ChezScheme/boot/pb/.git
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<
bremner >
ah, I see asumu answered my question by email a month ago
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<
klf >
quick question, how do you check the signedness of an integer in Racket?
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<
aeth >
klf: Like in mathematics, Lisps split numbers in three. In Schemes, including Racket, a number is positive? or negative? or zero?
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<
aeth >
(nan/inf stuff might mess with that a bit)
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<
aeth >
There are lots of different ways to special-case zero if you don't want this. The easiest way would be to just use NOT or something like that, but that wouldn't take into account signed 0 with floats, since even -0.0 isn't negative? in Racket.
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<
klf >
aeth what do you mean by the use of NOT? why do we want to negate the number?
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<
aeth >
klf: Sorry for being unclear. If you wanted to split numbers in two instead of in three you could do: (not (negative? x)) and (negative? x)
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<
aeth >
(technically, +nan.0 and -nan.0 aren't positive? or negative? or zero? so just for NaN the assumption of numbers splitting in three breaks, but in that case, NaNs would all be nonnegative)
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<
klf >
aeth I am not sur how (not (negative? x)) and (negative? x) answers the question of signedness.
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<
aeth >
klf: it depends on how you want to handle 0
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<
aeth >
0 distinct => positive?/negative?/zero?; 0 with 1, 2, 3, 4, 5, etc. => not negative? / negative?
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<
the-smug-one >
Sup sup
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