[Numpy-discussion] change the mask state of one element in a masked array

Olivier Delalleau shish@keba...
Sat Feb 18 10:19:49 CST 2012


There may be a better way to do it, but you can first do:
a.mask = np.zeros_like(a)
then afterwards e.g. a.mask[0, 0] = True will work.

-=- Olivier

Le 18 février 2012 10:52, Chao YUE <chaoyuejoy@gmail.com> a écrit :

> Dear all,
>
> I built a new empty masked array:
>
> In [91]: a=np.ma.empty((2,5))
>
> In [92]: a
> Out[92]:
> masked_array(data =
>  [[  1.20569155e-312   3.34730819e-316   1.13580079e-316   1.11459945e-316
>     9.69610549e-317]
>  [  6.94900258e-310   8.48292532e-317   6.94900258e-310   9.76397825e-317
>     6.94900258e-310]],
>              mask =
>  False,
>        fill_value = 1e+20)
>
>
> as you see, the mask for all the elements are false. so how can I set for
> some elements to masked elements (mask state as true)?
> let's say, I want a[0,0] to be masked.
>
> thanks & cheers,
>
> Chao
>
> --
>
> ***********************************************************************************
> Chao YUE
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>
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>
>
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