[Numpy-discussion] comparing arrays with NaN in them.

David Goldsmith David.L.Goldsmith@noaa....
Fri Aug 24 11:23:23 CDT 2007


What is meant by "multiple nan-s"?

DG

mark wrote:
> There may be multiple nan-s, but what Chris did is simply create one
> with the same nan's
>
>   
>>>> a = N.array((1,2,3,N.nan))
>>>> b = N.array((1,2,3,N.nan))
>>>>         
>
> I think these should be the same.
> Can anybody give me a good reason why they shouldn't, because it could
> confuse a lot of people?
>
> Thanks, Mark
>
> ps. I have to admit though, that matlab does the same thing. nan==nan
> is false.
>
> On Aug 24, 4:51 am, Warren Focke <fo...@slac.stanford.edu> wrote:
>   
>> On Thu, 23 Aug 2007, Christopher Barker wrote:
>>     
>>> but that feels like a kludge. maybe some sort of "TheseArrays are binary
>>> equal" would be useful.
>>>       
>> But there are multiple possible NaNs, so you couldn't rely on the bits
>> comparing.
>>
>> Maybe something with masked arrays?
>>
>> w
>>
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