[petsc-users] Allocating memory for off-diagonal matrix blocks when using DMComposite

[Jed Brown]

Dave May <dave.mayhem23 at gmail.com> writes:
> You are always free to over-ride the method
>   dm->ops->creatematrix
> with your own custom code to create
> and preallocate the matrix.

DMShellSetCreateMatrix()

No need to include the private header.  I know this isn't great.
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