numpy.ma.nonzero(self) = Return the indices of unmasked elements that are not zero. Returns a tuple of arrays, one for
MaskedArray.unshare_mask()
MaskedArray.max(axis=None, out=None, fill_value=None)
numpy.ma.cumprod(self, axis=None, dtype=None, out=None) = Return the cumulative product of the elements along the given axis
MaskedArray.sort(axis=-1, kind='quicksort', order=None, endwith=True, fill_value=None)
MaskedArray.clip(min=None, max=None, out=None)
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