numpy.ma.empty_like(a, dtype=None, order='K', subok=True) = Return a new array with the same shape and type as a given array

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

numpy.ma.maximum_fill_value(obj)

numpy.ma.masked_where(condition, a, copy=True)

MaskedArray.swapaxes(axis1, axis2)

numpy.ma.fromfunction(function, shape, **kwargs) = Construct an array by executing a function over each coordinate.

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

MaskedArray.data Return the current data, as a view of the original underlying data.

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

numpy.ma.sort(a, axis=-1, kind='quicksort', order=None, endwith=True, fill_value=None)