[petsc-dev] SNES, Coloring, DM, and TS

[Jed Brown]

On Sat, Mar 3, 2012 at 18:51, Barry Smith <bsmith at mcs.anl.gov> wrote:

>  If no compute Jacobian routine was provided it just always uses the
> original matrix that was set into the SNESSetJacobian.  I can live with
> removing this feature, I agree it is a little dangerous.


What about making it explicit?

SNESSetJacobian(...,SNESDefaultComputeJacobianConstant,PETSC_NULL);

This routine would explicitly leave the Jacobian unchanged.
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