[petsc-users] DMDA questions

[Jed Brown]

Xiangdong <epscodes at gmail.com> writes:

> For the MatSetValuesStencil, should it always work in pair with
> DMCreateMatrix?

Yes, or MatSetStencil.

> However, in some example, e.g., src/ksp/ksp/examples/tutorials/ex25.c, the
> DMCreateMatrix is never called. Is it because KspSetComputeOperators is
> used and DMCreateMatrix is called implicitly somewhere?

No, it is just testing that certain functionality works even if the DM
is not set.  If you have a DM, we recommend setting it.
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