[petsc-dev] Generality of VecScatter

[Matthew Knepley]

On Wed, Nov 23, 2011 at 6:49 PM, Jed Brown <jedbrown at mcs.anl.gov> wrote:

> On Wed, Nov 23, 2011 at 18:43, Dmitry Karpeev <karpeev at mcs.anl.gov> wrote:
>
>> What does this mean: "where one side has at most one edge"?
>
>
> A "local" point corresponds to at most one "global" point.
>
> Suppose we have scatter between spaces {a,b,c,d} and {x,y,z}.
>
> An example of a valid scatter is
>
> Scatter1 = {(a,y),(b,z),(c,y)}
>
> This is entirely useful, but I don't know if the following is useful:
>
> Scatter2 = {(b,y),(b,z),(c,y)}
>
> Is anyone using scatters that look like Scatter2? For what purpose?
>

Yes, for mesh distribution

  Matt

-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener
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