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Re: NaN comparisons - Call For Anecdotes

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  Re: NaN comparisons - Call For Anecdotes Ian Kelly <ian.g.kelly@gmail.com> - 2014-07-08 13:50 -0600
    Re: NaN comparisons - Call For Anecdotes Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-07-09 01:00 +0000

#74208 — Re: NaN comparisons - Call For Anecdotes

On Tue, Jul 8, 2014 at 1:16 PM, Ethan Furman <ethan@stoneleaf.us> wrote:
> What you said is: "They just don't appear in normal computation, because the
>
> interpreter raises an exception instead."
>
> I just ran a calculation that created a NaN, the same as 4 - 3 creates a 1,
> and no exception was raised.
>
> Do you have an example where one is?

The math module functions raise exceptions instead of returning NaN.

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#74220

On Tue, 08 Jul 2014 13:50:06 -0600, Ian Kelly wrote:

> The math module functions raise exceptions instead of returning NaN.

That's not the only way that NANs can be constructed. In particular, the 
OP is collecting NANs from some other device. I don't know how it ends up 
with NANs, but it does, so he has to deal with them.


-- 
Steven 

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