[petsc-dev] controlling vector values while doing matrix free operations

Jed Brown jedbrown at mcs.anl.gov
Wed Dec 14 21:45:36 CST 2011

On Wed, Dec 14, 2011 at 19:40, Dmitry Karpeev <karpeev at mcs.anl.gov> wrote:

> The trouble is that the constraints can get "eliminated" only when they
> become active.

That's not what I meant. I meant to transform the algebraic system so that
those extra variables were eliminated. The point is that we tend to put a
lot of effort into designing effective preconditioners for a standard
formulation (e.g. conservative variables), and that is partly lost of we
have this other system in which the evaluations of constitutive relations
are added explicitly.
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