Re: [Libmesh-devel] Truly Matrix Free Nonlinear Solves

[John P. <pet...@cf...>]

On Mon, Jun 29, 2009 at 3:07 PM, Derek Gaston<der...@in...> wrote:
> We could, of course, derive a new tree
> of Systems from ExplicitSystem that behaves similarly to the
> (Nonlinear)ImplicitSystem tree... but that feels like a bad
> duplication for something that really comes down to a small change in
> behavior.

1.) Instead of doing a duplicate tree, could you just redo your
current tree to inherit from ExplicitSystem instead, and then manage
when and where a SparseMatrix is needed in your framework code?

2.) Could you hack up a new SparseMatrix implementation or some kind
of shell matrix which does nothing when told to initialize itself and
throws errors when it's told to do something it doesn't know how to
do?

-- 
John