On Thu, Jan 17, 2019 at 03:05:17PM -0600, David Rock wrote:
> In [7]: nan == nan
> Out[7]: False
>
> In [8]: a = 1.1
>
> In [9]: a ==a
> Out[9]: True
> both a and nan are floats, so why does a == a work, but nan == nan
> doesn’t?
They both "work", because they both do what they are designed to do.
Equality between two floats works something like this:
if either number is a NAN:
return False
if both numbers are 0.0 or -0.0:
return True
if both numbers have the same bit-pattern:
return True
otherwise return False
--
Steve
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