On 08/22/2015 01:27 PM, allan gottlieb wrote: >> >> Floating point addition isn't even commutative: >> >> > 0.1 + 0.2 + 0.3 >> 0.6000000000000001 >> > 0.1 + (0.2 + 0.3) >> 0.6 > > That demonstrates non-associativity. I believe floating point is > commutative: a+b = b+a >
Derp, thanks, you're right =)
...but it's not commutative either:
>>> nan = float('nan')
>>> nan + 1 == 1 + nan
False
I'm cheating a bit there, the real problem is:
>>> nan == nan
False
