[petsc-users] Index set with zero size

[Jed Brown]

On Tue, Nov 9, 2010 at 12:49, Tim Kroeger
<tim.kroeger at cevis.uni-bremen.de>wrote:

> Well, as you know, I'm using PETSc only via libMesh.  Creating a standalone
> PETSc test case is non-trivial for me.  But I'll keep to this and will
> either find out that I did something wrong or produce a test case for you.
>
> It might be imporant to know that the original matrix is a ShellMatrix.
>

Yes, this is important.  Check the implementation of MatMultAdd for the
Shell.

Jed
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