Hui Zhang <mike.hui.zhang at hotmail.com> writes: > Thanks! My difficulty lie in that Ai is a result of matrix computations in a > sub-communcator (of the communicator of A). So I do not know a priori > the non-zero structure of Ai. Following the instructions of you, I think > I need to first MatGetRow of Ai, then MatSetValues to A. Is there a better > way?
When they're on different communicators, this is the recommended way.
