Xiangdong <[email protected]> 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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