numpy.ma.power(a, b, third=None)

numpy.ma.nonzero(self) = Return the indices of unmasked elements that are not zero. Returns a tuple of arrays, one for

numpy.ma.where(condition, x=, y=)

numpy.ma.max(obj, axis=None, out=None, fill_value=None)

MaskedArray.tolist(fill_value=None)

numpy.ma.masked_outside(x, v1, v2, copy=True)