[Numpy-discussion] Masked array usage

Robert Ferrell ferrell@diablotech....
Thu Nov 27 09:54:09 CST 2008


Sweet.  So simple.  That works great.

thanks,
-robert

On Nov 27, 2008, at 8:41 AM, Angus McMorland wrote:

> 2008/11/27 Robert Ferrell <ferrell@diablotech.com>:
>> I have a question about assigning to masked arrays.  a is a len ==3
>> masked array, with 2 unmasked elements.  b is a len == 2 array.  I
>> want to put the elements of b into the unmasked elements of a.  How  
>> do
>> I do that?
>>
>> In [598]: a
>> Out[598]:
>> masked_array(data = [1 -- 3],
>>      mask = [False  True False],
>>      fill_value=999999)
>>
>>
>> In [599]: b
>> Out[599]: array([7, 8])
>>
>> I'd like an operation that gives me:
>>
>> masked_array(data = [7 -- 8],
>>      mask = [False  True False],
>>      fill_value=999999)
>>
>> Seems like it shouldn't be that hard, but I can't figure it out.  Any
>> suggestions?
>
> How about:
>
> c = a.copy()
> c[~a.mask] = b
>
> Angus.
> -- 
> AJC McMorland
> Post-doctoral research fellow
> Neurobiology, University of Pittsburgh
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