> Matrix( 4, shape = scalar[1], datatype = float[4] );
                         [1.    0.    0.    0.]
                         [                    ]
                         [0.    1.    0.    0.]
                         [                    ]
                         [0.    0.    1.    0.]
                         [                    ]
                         [0.    0.    0.    1.]