[petsc-users] extract vector for a 2-D plane from a DM vector for a 3-D domain

[Jed Brown]

Roc Wang <pengxwang at hotmail.com> writes:
> I studied some examples for VecScatter.  To my understand, the pathway
> of extracting the plane is through extracting indexes (IS idx_to) of
> the 2-D plane from the vector of the 3-D domain(IS idx_from). To do
> this, I have to create an array of index for IS idx_to and create the
> corresponding IS by ISCreateGeneral(). Am I right?  Thanks for your
> informative response.

Yes.  You can use DMDAGetAO() for index translation if needed.
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