Why float('Nan') == float('Nan') is False
onlinejudge95 at gmail.com
Wed Feb 13 14:27:40 EST 2019
This definition of NaN is much better in mentally visualizing all the so
called bizarreness of IEEE. This also makes intuitive that no 2 NaN will be
equal just as no 2 infinities would be equal. I believe in a hypothesis(of
my own creation) that any arithmetic on a data type of NaN would be similar
to any set of operations on the set of Infinities.
On Thu, Feb 14, 2019, 12:33 AM Avi Gross <avigross at verizon.net wrote:
> I won't speak for the IEEE but NOT A NUMBER does not tell you what
> If "Hello, World!" is not a number as in an int or a float and we throw
> the content and simply call it a NaN or something and then we notice that
> object that is a list of fruits is also not a number so we call it a NaN
> too, then should they be equal?
> A NaN is a bit like a black hole. Anything thrown in disappears and that is
> about all we know about it. No two black holes are the same even if they
> seem to have the same mass, spin and charge. All they share is that we
> know what is in them.
> When variable "a" is a Nan then it is sort of a pointer to a concept. The
> pointer IS itself but the concepts may not be.
> -----Original Message-----
> From: Python-list <python-list-bounces+avigross=verizon.net at python.org> On
> Behalf Of Grant Edwards
> Sent: Wednesday, February 13, 2019 1:03 PM
> To: python-list at python.org
> Subject: Re: Why float('Nan') == float('Nan') is False
> On 2019-02-13, ast <none at gmail.com> wrote:
> > Hello
> > >>> float('Nan') == float('Nan')
> > False
> If you think that's odd, how about this?
> >>> n = float('nan')
> >>> n
> >>> n is n
> >>> n == n
> > Why ?
> IEEE says so.
> Grant Edwards grant.b.edwards Yow! Like I always say
> at -- nothing can beat
> gmail.com the BRATWURST here in
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