Hey, Barry, thank you so much for your help and sincerity. I'll do some more tests tomorrow with different problems (using finite elements to discretize the PDE) and I see how it goes.
Just one thing that wasn't directly answered (maybe you forgot to or maybe you don't know): I still don't get why the JFNK created 4 matrix objects. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20081219/6247c114/attachment.htm>
