numpy.ma.harden_mask
- 
numpy.ma.harden_mask(self) = <numpy.ma.core._frommethod instance> - 
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
hardmask 
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Licensed under the NumPy License.
    https://docs.scipy.org/doc/numpy-1.13.0/reference/generated/numpy.ma.harden_mask.html