Portably generating infinity and NaN
robert.kern at gmail.com
Thu Apr 12 21:53:16 CEST 2007
Michael Hoffman wrote:
> What's the best way to portably generate binary floating point infinity
> and NaNs? I only know two solutions:
> 1. Using the fpconst module proposed in IEEE 754, which I believe shifts
> bits around.
> 2. Using an extension module (for example, numarray.ieeespecial will do it).
> I thought of using float(Decimal("nan")), but apparently
> Decimal.__float__(self) is float(str(self)), which isn't portable.
This is what numpy does (translated from the C):
mul = 1e10
inf = mul
tmp = 0.0
inf *= mul
if inf == tmp:
tmp = inf
nan = inf / inf
"I have come to believe that the whole world is an enigma, a harmless enigma
that is made terrible by our own mad attempt to interpret it as though it had
an underlying truth."
-- Umberto Eco
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