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| References | (2 earlier) <87zj9te3tz.fsf@elektro.pacujo.net> <qotk30xjpib.fsf@ruuvi.it.helsinki.fi> <mailman.17477.1420729115.18130.python-list@python.org> <54af32f4$0$12990$c3e8da3$5496439d@news.astraweb.com> <CAPTjJmoN+PWTTYkc_DaADgwAeVc9QVSK8S1sJn9O28ugrDYExA@mail.gmail.com> |
|---|---|
| From | Ian Kelly <ian.g.kelly@gmail.com> |
| Date | 2015-01-08 19:12 -0700 |
| Subject | Re: where in Nan defined |
| Newsgroups | comp.lang.python |
| Message-ID | <mailman.17494.1420769609.18130.python-list@python.org> (permalink) |
On Thu, Jan 8, 2015 at 7:07 PM, Chris Angelico <rosuav@gmail.com> wrote:
> On Fri, Jan 9, 2015 at 12:46 PM, Steven D'Aprano
>> The fallback rule I use when float('nan') fails is
>>
>> INF = 1e3000 # Hopefully, this should overflow to INF.
>> NAN = INF-INF # And this hopefully will give a NaN.
>
> The first question is "will 1eN overflow to inf?". I'm fairly sure
> Python guarantees that an unrepresentable float constant will be
> treated as infinity, so all you have to do is crank up the exponent
> any time you suspect it'll be representable.
Or to never have to worry about it:
INF = 1e400
while not math.isinf(INF):
INF *= INF
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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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