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Re: where in Nan defined

References <m8m3et$1gu$2@speranza.aioe.org> <mailman.17472.1420727095.18130.python-list@python.org> <87zj9te3tz.fsf@elektro.pacujo.net>
Date 2015-01-09 01:45 +1100
Subject Re: where in Nan defined
From Chris Angelico <rosuav@gmail.com>
Newsgroups comp.lang.python
Message-ID <mailman.17476.1420728314.18130.python-list@python.org> (permalink)

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On Fri, Jan 9, 2015 at 1:37 AM, Marko Rauhamaa <marko@pacujo.net> wrote:
> Ian Kelly <ian.g.kelly@gmail.com>:
>
>> To get nan as a literal just do:
>>
>>     nan = float("nan")
>
> True, but that got me thinking: what standard Python math operation
> evaluates to NaN?

Subtracting infinity from infinity is one easy way.

>>> 1e309
inf
>>> 1e309-1e309
nan

ChrisA

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where in Nan defined maurog <qualsivoglia@dovetipare.nz> - 2015-01-08 14:15 +0000
  Re: where in Nan defined Ian Kelly <ian.g.kelly@gmail.com> - 2015-01-08 07:24 -0700
    Re: where in Nan defined Marko Rauhamaa <marko@pacujo.net> - 2015-01-08 16:37 +0200
      Re: where in Nan defined Chris Angelico <rosuav@gmail.com> - 2015-01-09 01:45 +1100
        Re: where in Nan defined Jussi Piitulainen <jpiitula@ling.helsinki.fi> - 2015-01-08 16:55 +0200
      Re: where in Nan defined Jussi Piitulainen <jpiitula@ling.helsinki.fi> - 2015-01-08 16:50 +0200
        Re: where in Nan defined Chris Angelico <rosuav@gmail.com> - 2015-01-09 01:58 +1100
          Re: where in Nan defined Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-01-09 12:46 +1100
            Re: where in Nan defined Chris Angelico <rosuav@gmail.com> - 2015-01-09 13:07 +1100
            Re: where in Nan defined Ian Kelly <ian.g.kelly@gmail.com> - 2015-01-08 19:12 -0700
            Re: where in Nan defined Chris Angelico <rosuav@gmail.com> - 2015-01-09 13:25 +1100
  Re: where in Nan defined Chris Angelico <rosuav@gmail.com> - 2015-01-09 01:28 +1100

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