numpy.ma.ones(shape, dtype=None, order='C') = Return a new array of given shape and type, filled with ones.

numpy.ma.vstack(tup) = Stack arrays in sequence vertically (row wise). Take a sequence of arrays and stack them vertically

numpy.ma.asanyarray(a, dtype=None)

numpy.ma.asarray(a, dtype=None, order=None)

numpy.ma.median(a, axis=None, out=None, overwrite_input=False)

MaskedArray.argmin(axis=None, fill_value=None, out=None)

numpy.ma.atleast_1d(*arys) = Convert inputs to arrays with at least one dimension. Scalar inputs are converted to 1-dimensional

numpy.ma.trace(self, offset=0, axis1=0, axis2=1, dtype=None, out=None) a.trace(offset=0, axis1=0, axis2=1, dtype=None, out=None) =

numpy.ma.inner(a, b)

MaskedArray.tobytes(fill_value=None, order='C')