[Python-Dev] Why is nan != nan?

[Jesus Cea]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On 03/25/2010 12:22 PM, Nick Coghlan wrote:
>   "Not a Number" is not a single floating point value. Instead each
>   instance is a distinct value representing the precise conditions that
>   created it. Thus, two "NaN" values x and y will compare equal iff they
>   are the exact same NaN object (i.e. "if isnan(x) then x == y iff
>   x is y".
> 
> As stated above, such a change would allow us to restore reflexivity
> (eliminating a bunch of weirdness) while still honouring the idea of NaN
> being a set of values rather than a single value.

Sounds good.

But IEEE 754 was created by pretty clever guys and sure they had a
reason for define things in the way they are. Probably we are missing
something.

- -- 
Jesus Cea Avion                         _/_/      _/_/_/        _/_/_/
jcea at jcea.es - http://www.jcea.es/     _/_/    _/_/  _/_/    _/_/  _/_/
jabber / xmpp:jcea at jabber.org         _/_/    _/_/          _/_/_/_/_/
.                              _/_/  _/_/    _/_/          _/_/  _/_/
"Things are not so easy"      _/_/  _/_/    _/_/  _/_/    _/_/  _/_/
"My name is Dump, Core Dump"   _/_/_/        _/_/_/      _/_/  _/_/
"El amor es poner tu felicidad en la felicidad de otro" - Leibniz
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.9 (GNU/Linux)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/

iQCVAwUBS6tZfZlgi5GaxT1NAQJZtQP/bxi6l5TaiiOzv+no6cLaVXbkWXb9v6OL
jmejzrlAosXzzd/4CuinN2mdFs7bd9Y3O9gHoQ2nUfbfWQc4SwxpxjK67j10PODJ
MMz7wXgz075A8S7gUlpwWznByU2VfAys6ZVxZCv/uogW9SXIHqEBC/sXwWN5Hwvn
uHImzIL4bfs=
=RI3T
-----END PGP SIGNATURE-----