Numpy 1.11
Numpy 1.11
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numpy.ma.is_mask()

numpy.ma.is_mask

numpy.ma.is_mask(m) [source]

Return True if m is a valid, standard mask.

This function does not check the contents of the input, only that the type is MaskType. In particular, this function returns False if the mask has a flexible dtype.

Parameters:

m : array_like

Array to test.
Returns:

result : bool