I tried -snes_compare_explicit, and got the following error: [0]PETSC ERROR: Invalid argument
[0]PETSC ERROR: Matrix not generated from a DMDA What am I doing wrong? On Tue, Oct 3, 2017 at 10:08 AM, Jed Brown <j...@jedbrown.org> wrote: > Barry Smith <bsm...@mcs.anl.gov> writes: > > >> On Oct 3, 2017, at 5:54 AM, zakaryah . <zakar...@gmail.com> wrote: > >> > >> I'm still working on this. I've made some progress, and it looks like > the issue is with the KSP, at least for now. The Jacobian may be > ill-conditioned. Is it possible to use -snes_test_display during an > intermediate step of the analysis? I would like to inspect the Jacobian > after several solves have already completed, > > > > No, our currently code for testing Jacobians is poor quality and > poorly organized. Needs a major refactoring to do things properly. Sorry > > You can use -snes_compare_explicit or -snes_compare_coloring to output > differences on each Newton step. >
