On Mon, Jun 1, 2009 at 5:21 PM, Carlo Rossi <serosole at yahoo.it> wrote: > Hello, > I have a matrix A and I need to do it: > > sum1 = SUM_of_all_element_on_diagonal sum1 = trace(A) > sum2 = sum_ofAllElemetNonOn_theDiagonal; > sum2 = sum(sum(A)) - sum1 > is it possible to do it in a compact way? thanks > Dmitri.