def METHOD_NAME():
    """ Matrix Type test """
    covar_nparray = np.array([[2.2128, 0, 0, 0],
                              [0.0002, 2.2130, 0, 0],
                              [0.3897, -0.00004, 0.0128, 0],
                              [0, 0.3897, 0.0013, 0.0135]]) * 1e3
    matrix = Matrix(covar_nparray)
    assert(np.array_equal(matrix, covar_nparray))