[petsc-users] inplace MatPtAP

[Patrick Lacasse]

I have to compute a product Pt*A*P.

My projection matrix P won't change the structure of A and I don't need to
keep the original A.
Is it possible to do it inplace (modify A instead of creating a new C)?

Do you think it is feasible to expend MatPtAP to mpiaij and/or sbaij
matrices?

There is more implementation of MatMatMult.
Is it possible to do Pt*A and A*P directly into A (without creating a copy)?

Patrick Lacasse
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