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Showing content from https://mail.python.org/pipermail/python-dev/2010-March/098895.html below:

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

[Python-Dev] Why is nan != nan? [Python-Dev] Why is nan != nan?Curt Hagenlocher curt at hagenlocher.org
Thu Mar 25 16:01:54 CET 2010
On Thu, Mar 25, 2010 at 7:54 AM, Mark Dickinson <dickinsm at gmail.com> wrote:
>
> Hmm. I take it back.  I was being confused by the fact that sqrt(nan)
> returns a nan with a new identity;  but it does apparently preserve
> the payload.  An example:

I played with this some a few months ago, and both the FPU and the C
libraries I tested will preserve the payload. I imagine Python just
inherits their behavior.

--
Curt Hagenlocher
curt at hagenlocher.org
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