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

[Chris Eldred]

The closure operation makes sense, but what I want is something a little
different.

I have a field that is defined as follows:
field(edge,cell) = blah
ie it really lives on the union of cells and edges (or vertex/edges,
cells/vertexs, etc.)

Is this something that can be defined using DMComplex and Sections?

On Wed, Jul 25, 2012 at 11:39 AM, Matthew Knepley <knepley at gmail.com> wrote:

> 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
>



-- 
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
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