petsc-3.7.5 2017-01-01

PetscSFCreateEmbeddedSF

removes edges from all but the selected roots, does not remap indices

Synopsis

#include "petscsf.h" 
PetscErrorCode PetscSFCreateEmbeddedSF(PetscSF sf,PetscInt nroots,const PetscInt *selected,PetscSF *newsf)

Collective

Input Arguments

	sf	- original star forest
	nroots	- number of roots to select on this process
	selected	- selected roots on this process

Output Arguments

newsf -new star forest

Note

To use the new PetscSF, it may be necessary to know the indices of the leaves that are still participating. This can be done by calling PetscSFGetGraph().

Examples