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 _______________________________________________ Haskell mailing list Haskell@haskell.org http://www.haskell.org/mailman/listinfo/haskell