numpy.ma.harden_mask(self) = <numpy.ma.core._frommethod object>
Force the mask to hard.
Whether the mask of a masked array is hard or soft is determined by its hardmask
property. harden_mask
sets hardmask
to True.
See also
hardmask
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Licensed under the 3-clause BSD License.
https://docs.scipy.org/doc/numpy-1.17.0/reference/generated/numpy.ma.harden_mask.html