[petsc-dev] Generality of VecScatter

[Jed Brown]

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?
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