[petsc-users] help needed for -snes_mf_operator

[Jed Brown]

On Wed, Apr 25, 2012 at 06:25, Jed Brown <jedbrown at mcs.anl.gov> wrote:

> Run with -ksp_monitor_true_residual -ksp_converged_reason -snes_monitor
> -snes_converged_reason -snes_ls_monitor -snes_view and send the output.
>
> Your SNES callback gets two Mat arguments, into which are you assembling
> your approximate Jacobian? Are you still calling MatAssemblyBegin/End on
> the first argument, as in the examples?
>

There are plenty of additional suggestions here

http://scicomp.stackexchange.com/questions/30/why-is-newtons-method-not-converging
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