float norm() float norm2() Matrix normv()
Norm of the matrix, and the square of the norm of the matrix. (The later method is because you may skip a square root sometimes.)
This equals |A| or sqrt( A02 + A12 + ... + An2 ).
It is only usable with 1xn or nx1 matrices.
m->normv() is equal to m*(1.0/m->norm()), with the exception that the zero vector will still be the zero vector (no error).