• norm1(M)—Returns the L1 norm, or the maximum of the absolute column sums, of matrix M.

• norm2(M)—Returns the L2 norm, or the largest absolute singular value, of matrix M.

• norme(M)—Returns the Euclidean norm, or the square root of the sum of the absolute squares of elements, of matrix M.

• normi(M)—Returns the Infinity norm, or the maximum of the absolute row sums, of matrix M.

• M is a square matrix.