1MatMult err 0.000322366 2A Matrix norms: infty=28.3691, norm_1=28.3691, norm_2=-1. 3A Approx Matrix norms: infty=28.3691, norm_1=28.3691, norm_2=23.9864 4B Approx Matrix norms: infty=-1., norm_1=-1., norm_2=-1. 5