Hi, I'm interested in efficient implementations of various vector and matrix norms. Please can anyone give me some short examples regarding the following norms for vectors : 1. Frobenius norm 2. L_1 norm is sum of absolute values 3. L_2 norm 4. L_\infty or maximum norm 5. p-norm and matrices: matrix spectral norm or matrix 2-norm Frobenius norm ||A||_F p-norms ||A||_p Thanks in advance. Nils