<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">I simplified the example I had sent yesterday even further. I don't think that I can do much simpler than that. I could not find the working examples in the petsc-dev tree.<div><br></div><div>Blaise</div><div><br><div><br></div><div></div></div></body></html>