[petsc-users] DMDA questions

[Jed Brown]

Xiangdong <epscodes at gmail.com> writes:
> I am not clear about this. In this example, where is the format declaration
> (e.g.,mpiaij) of Mat jac? Why is this mat jac always distributed in
> a compatible way as the DM vectors?

src/ksp/ksp/examples/tutorials/ex25.c calls KSPSetDM and sets functions
to assemble the matrices and right hand side.  Those objects are created
internally (you can use -dm_mat_type sbaij if you like) and the user
doesn't have to see them.
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