On Oct 4, 3:50 am, spasmous <spasm...@gmail.com> wrote: > For a general matrix (rectangular, non-symmetric) is there an iterative method for solving J*x=b that only uses multiplies J*v and no transpose multiples J'*u? I know there are many methods based on J'*J.

Perhaps you could tell us what v and u are? What method is that?