[petsc-users] Sub-indexing or SparseMult?

[Jed Brown]

VecGetSubVector has lower overhead and might be implemented without a copy.
On Sep 26, 2011 11:32 AM, "Hui Zhang" <mike.hui.zhang at hotmail.com> wrote:
> Hi all,
>
> I just come into this question: if one wants a sub-vector with contiguous
indices
> in the whole vector, surely, one can use getsubvec, but also one can setup
a
> sparse boolean matrix for this aim; so which method is better, considering

> the whole vector is local or parallel?
>
> Thanks very much for any suggestions!
>
> Best wishes,
> Hui
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