#include "petscsf.h" PetscErrorCode PetscSFCompose(PetscSF sfA,PetscSF sfB,PetscSF *sfBA)
| sfA | - The first PetscSF, whose local space may be a permutation, but can not be sparse. | |
| sfB | - The second PetscSF, whose number of roots must be equal to number of leaves of sfA on each processor |