Undefined offset: 4

[jtejido]

with m x n:

        $array = array(array('1', '0', '0', '0', '2'), 
                array('0', '0', '3', '0', '0'),
                array('0', '0', '0', '0', '0'),
                array('0', '2', '0', '0', '0'));

        $matrix = new Matrix($array);
        $svd = new SingularValueDecomposition($matrix);