Hello everyone, I don't understand how to use iterators with matrices; how can I scan all the elements of a matrix? The only thing I have managed to do until now is to read/write the elements of the first row or the first column: ublas::matrix<int> M(3,3); int i = 0; for( ublas::matrix<int>::iterator1 Mit1 = M.begin1(); Mit1 != M.end1(); Mit1++ ) { *Mit1 = i; i++; } Are there such things as row iterators, column iterators, or iterators ocver all the elements of the matrix? Thanks Régis B.