[petsc-dev] DMGetMatrix --> DMGetMatrices?

[Jed Brown]

On Fri, Feb 10, 2012 at 15:49, Dmitry Karpeev <karpeev at mcs.anl.gov> wrote:

> Yes, DMGetMatrix responds the same way wherever you call it from, but
> what will happen if you call DMSetMatrixPreallocateOnly() and use that DM
> with a KSP?
> It seems to me that once DMSetMatrixPreallocateOnly() has been called,
> that DM is only usable from SNES.
>

Huh? DMGetMatrix() never puts useful values in the matrix, it's just the
difference between specifying the number of nonzeros per row and placing
those nonzeros where they belong.
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