petsc-3.12.5 2020-03-29

PetscSFComposeInverse

Compose a new PetscSF by putting inverse of the second SF under the first one

#include "petscsf.h" 
PetscErrorCode PetscSFComposeInverse(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 leaves must be equal to number of leaves of sfA on each processor. All roots must have degree 1.

sfBA -The composite SF. Doing a Bcast on the new SF is equvalent to doing Bcast on sfA, then Bcast on inverse of sfB

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