[petsc-dev] DMGetMatrix --> DMGetMatrices?

[Jed Brown]

On Fri, Feb 10, 2012 at 00:05, Dmitry Karpeev <karpeev at mcs.anl.gov> wrote:

> I don't think so.  Preallocating doesn't set any values and seems to leave
> the matrix marked !assembled.
> MatDuplicate for such a matrix will fail.  Assemblying it before setting
> values (just to force an assembled flag)
> will squeeze out the extra values, won't it?  I think it would just be
> reasonable to allow to duplicate unassembled
> matrices, or, better yet, have a matrix be "assembled" by default until
> MatSetValues has been called.
> But I'm not sure whether either solution will break something else.
>

Are you calling DMSetMatrixPreallocateOnly()?
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