numpy.ma.harden_mask
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numpy.ma.harden_mask(self) =
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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
    © 2008–2016 NumPy Developers
Licensed under the NumPy License.
    https://docs.scipy.org/doc/numpy-1.11.0/reference/generated/numpy.ma.harden_mask.html