NaN comparisons - Call For Anecdotes

[MRAB]

On 2014-07-10 01:57, Ben Finney wrote:
> "Anders J. Munch" <2014 at jmunch.dk> writes:
>
>> Joel Goldstick wrote:
>> > I've been following along here, and it seems you haven't received
>> > the answer you want or need.
>>
>> So far I received exactly the answer I was expecting. 0 examples of
>> NaN!=NaN being beneficial.
>
> Predictability and ease of diagnosis are the principles at work
> <URL:http://stackoverflow.com/a/1573715/70157>. You have already
> received examples of those.
>
> If those don't convince you of its usefulness, that's unfortunate, but
> at this point you are demonstrating a standard which is both
> unreasonably high (even the rationale of the committee doesn't convince
> you) and unreasonably low (you ask not for explanations but personal
> anecdotes).
>
> Good luck to you in your quest.
>
I can think of one place where equality of NaNs would be useful:
sorting.

However, in that use-case, you would also want it to be orderable,
perhaps greater than any other non-NaN float.