[petsc-dev] DMComplex and Coordinates

[Matthew Knepley]

On Wed, Sep 26, 2012 at 5:24 PM, Chris Eldred <chris.eldred at gmail.com>wrote:

> On the subject:
>
> How do coordinates work for user-defined DMComplex objects? What
> determines the Coordinate section (and which points does it contain?)?
> How is the coordinate vector set?


I am just rewriting this. Now it will be

  DMGetCoordinateDM(DM, DM *)
  DMGetCoordinates(DM, Vec *)
  DMGetCoordinatesLocal(DM, Vec *)

and there is a convenience

  DMComplexGetCoordinateSection(DM, PetscSection *)

By default, I read in the vertex coordinates from the mesh generator.
However,
the idea is that you can interpret the coordinates however you want. We just
give you a DM and a vector. You can construct the section however you want,
although without vertex coordinates some default things will not work, like
VTK
output.

    Matt


>
> --
> 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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