[Numpy-discussion] Masked array usage

[Angus McMorland]

2008/11/27 Robert Ferrell <ferrell at 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