[petsc-dev] DM field interfaces

[Jed Brown]

On Sat, Feb 25, 2012 at 12:23, Jed Brown <jedbrown at mcs.anl.gov> wrote:

> I now realize a weakness in my PF transformation suggestion: it doesn't
> work with vector elements (Raviart-Thomas or Nedelec) or staggered grids. I
> don't know a way to include that with the ability to transform from
> conservative to primitive variables. This is unfortunate because many
> important preconditioning methods operate in different variables than the
> nonlinear system is defined in.


This is to say, that sort of transformation can't reasonably be
_implemented_ using only DM base, it has to be implemented using DMXXXSet*
methods.
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