petsc-3.7.7 2017-09-25

PetscSFCreateInverseSF

given a PetscSF in which all vertices have degree 1, creates the inverse map

#include "petscsf.h" 
PetscErrorCode PetscSFCreateInverseSF(PetscSF sf,PetscSF *isf)

Collective

sf -star forest to invert

isf -inverse of sf

All roots must have degree 1.

The local space may be a permutation, but cannot be sparse.