[petsc-users] sieve-dev Data shared between points in a Sieve DAG

[Matthew Knepley]

On Wed, Jul 25, 2012 at 11:23 AM, Chris Eldred <chris.eldred at gmail.com>wrote:

> I was wondering if it was possible to have fields that are shared between
> points in a sieve DAG:
>
> For example, I would like to have data that is connected to both an edge
> and a cell (instead of just tied to a Section). Consider a cell with three
> edges (ie a triangular cell).
>
> Before I was just using a length 3 array attached to the cell with the
> convention that the ordering of the array matched the ordering of the edge
> list associated with the cell. Now, I would like an implementation that
> does not assume anything about the ordering of the edge list (since I am
> getting that from cones/supports).
>

I think what you want is the Closure operation. The closure of a cell will
give you all the unknowns on its edges and vertices.
Does that make sense?

  Thanks,

     Matt


> Thanks,
> -Chris Eldred
>
> --
> Chris Eldred
> DOE Computational Science Graduate Fellow
> Graduate Student, Atmospheric Science, Colorado State University
> B.S. Applied Computational Physics, Carnegie Mellon University, 2009
> chris.eldred at gmail.com
>



-- 
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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