diary 'slownorm.txt' version for s = [50 100 150] for i = 1:5 A = sprand(s,s, 0.1 ); tic(); n1 = norm(A); t1 = toc(); tic(); n2 = norm(full(A)); t2 = toc(); printf("Norm diff: %6.4g, sparse time: %7.5f, full matrix time: %7.5f. Speed x: %f\n", n1-n2, t1, t2, t1/t2 ); end end