[petsc-users] A quick question

[Jed Brown]

On Wed, Feb 20, 2013 at 8:08 PM, Teranishi, Keita <knteran at sandia.gov>wrote:

>  Hi PETSc users.
>
>  I just want to double-chcek if MatMultMPIAIJ requires matrix and vector
> to have the same data (row) partitioning.   Otherwise, it throws
> PETSC_ERROR.  Is it true?
>

Yes, in A * x ---> y, the column-layout of A must match x and the
row-layout must match y.

We should raise an error in case of mismatch.
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