Is there a way to view a scatter plot of the non-zero elements of a petsc matrix after it and the right hand side have been created in petsc - so that the matrix structure can be visually inspected? Thanks, Dave -- Dave Nystrom LANL HPC-5 Phone: 505-667-7913 Email: [email protected] Smail: Mail Stop B272 Group HPC-5 Los Alamos National Laboratory Los Alamos, NM 87545