16 Jan
2008
16 Jan
'08
9:16 p.m.
Hi!
On Jan 11, 2008 7:30 AM, Cristian Baboi
NaN is not 'undefined'
Why not? What is a semantic difference? I believe Haskell should use undefined instead of NaN for all operations which are mathematically undefined (like 0/0). NaN should be used in a languages which does not support such nice Haskell features. Because if Haskell would use undefined such error would propagate itself to higher levels of computations, with NaN it does not. if bigComputation > 1 then ... else ... Would be evaluating else semantically correct if bigComputation returns NaN? No, it is not. With undefined this is correctly (not)evaluated. Mitar