[Numpy-discussion] comparing arrays with NaN in them.
David Goldsmith
David.L.Goldsmith at noaa.gov
Fri Aug 24 12:33:04 EDT 2007
Never mind. (Posted that before finishing the thread, sorry).
DG
David Goldsmith wrote:
> 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... at 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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>>>
>>>
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>
>
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