[petsc-dev] Non-scalable matrix operations

[Jed Brown]

On Fri, Dec 23, 2011 at 13:31, Mark F. Adams <mark.adams at columbia.edu>wrote:

> Ah yes, by "mat" I'm assuming a shell in this case.  The construction of
> these ISs needs a graph -- its not magic -- its a parallel multiplicative
> method.
>

Yes, the user should provide a Mat so that the library can build the ISs,
but the user shouldn't get a Mat back in their callback because they are
being asked to perform a nonlinear operation that does not use a Mat.
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