[petsc-users] Index set with zero size

[Jed Brown]

On Tue, Nov 9, 2010 at 12:56, Tim Kroeger
<tim.kroeger at cevis.uni-bremen.de>wrote:

> Thank you, I found it now: The shell matrix does not implement MatMultAdd,
> only MatMult.  Of course, it can't work then.  Thank you very much!


Okay, but then it will error instead of silently modifying the vector.

Jed
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