The RealFloat class has a number of methods for testing
various properties of a FP number:
isNaN :: a -> Bool
isInfinite :: a -> Bool
isDenormalized :: a -> Bool
isNegativeZero :: a -> Bool
isIEEE :: a -> Bool
If you really want to create an Infinity, I suggest 1/0,
but not all FP formats support it (IEEE754 does).
-- Lennart
Yitzchak Gale wrote:
While checking for floating-point overflow and
underflow conditions, I tried to create a somewhat
reliable cross-platform Infinity with the literal
"1e100000".
When GHC 6.4.1 reads this literal, it goes into a
deep trance and consumes huge amounts of
memory. Shouldn't it immediately recognize such a
thing as Infinity?
Is there a better way to check for Infinity? I
have not yet figured out how to check for NaN at
all - because it is not equal to itself. Any
suggestions?
BTW, I notice that Simon PJ proposed literals
for Infinity and Nan several years ago:
http://www.haskell.org/pipermail/haskell/2001-August/007753.html
Did anything ever come out of this?
Regards,
Yitzchak
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