numpy.ma.MaskedArray.harden_mask
- 
MaskedArray.harden_mask()[source] - 
Force the mask to hard.
Whether the mask of a masked array is hard or soft is determined by its
hardmaskproperty.harden_masksetshardmaskto True.See also
 
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    https://docs.scipy.org/doc/numpy-1.12.0/reference/generated/numpy.ma.MaskedArray.harden_mask.html