On Thu, Sep 24, 2020 at 6:48 AM Mark Adams <mfad...@lbl.gov> wrote: > >> Is there a way to avoid the explicit transposition of the matrix? >> > > It does not look like we have A*B^T for mpiaij as the error message says. > I am not finding it in the code. > > Note, MatMatMult with a transpose shell matrix, I suspect that it does an > explicit transpose internally, or it could notice that you have C^T*C and > we might have that implemented in-place (I doubt it, but it would be legal > and fine to do). >
We definitely have https://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Mat/MatPtAP.html For now, you can put the identity in for A. It would be nice it we assumed that when A = NULL. Patrick, the implementation strategy is broken for the MatProduct mechanism that was just introduced, so we cannot see which things are implemented in the documentation. How would I go about fixing it? Thanks, Matt > Many thanks, >> Olivier Jamond >> >> >> -- What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead. -- Norbert Wiener https://www.cse.buffalo.edu/~knepley/ <http://www.cse.buffalo.edu/~knepley/>
