[petsc-users] Get a smaller vector with PETSc

[Jed Brown]

Matthew Knepley <knepley at gmail.com> writes:
>> What about VecGetSubVector()<http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Vec/VecGetSubVector.html>?
>>
>
> Only works for local subsets.

Actually, VecGetSubVector() should work since in the case where the IS
is not both local and contiguous, it creates a VecScatter internally.
If you want a separate vector that you can keep (don't have to
VecRestoreSubVector) then you should use VecScatter yourself.
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