[petsc-dev] SNES, Coloring, DM, and TS

[Matthew Knepley]

On Tue, Feb 28, 2012 at 10:45 AM, Jed Brown <jedbrown at mcs.anl.gov> wrote:

> On Tue, Feb 28, 2012 at 10:40, Matthew Knepley <knepley at gmail.com> wrote:
>
>> Right now, DMs wrap up
>>  - Domain Topology
>>
>  - Domain Geometry
>>
>
> These are nowhere in the DM interface.
>

So you think this has nothing to do with
  - Refinement/coarsening
  - Local evaluation
  - Partitioning
It is all implied, and in fact only really works completely for Cartesian
stuff.


>
>
>>  - Modeling approximation (like function spaces, projectors)
>>
>
> This is only in the DM interface through coarsening and interpolation.
>

You also need to know this to piece together local evaluations.


>
>
 - Modeling equations (including decompositions, variable substitutions)
>>
>
> This is only in the DM interface with collective semantics. (For nonlinear
> ASM, I would be in favor of getting a subdomain DM which would have
> collective semantics on the subcommunicator instead of putting "local"
> evaluation into the public interface.)
>

The equations are there explicitly in all these function pointers it is
holding. What are you talking about?

   Matt


>
>> and I may have forgotten some stuff. That is a huge amount of crap for
>> one object.
>>
>
> You seem to be confusing the DM interface from a particular way of packing
> data into an implementation of DM.
>



-- 
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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