Always always always send the whole error message. "zakaryah ." <[email protected]> writes:
> 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 <[email protected]> wrote: > >> Barry Smith <[email protected]> writes: >> >> >> On Oct 3, 2017, at 5:54 AM, zakaryah . <[email protected]> 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. >>
