petsc-3.4.5 2014-06-29

DMDALocalToLocalBegin

Maps from a local vector (including ghost points that contain irrelevant values) to another local vector where the ghost points in the second are set correctly. Must be followed by DMDALocalToLocalEnd().

Synopsis

#include "petscdmda.h"   
PetscErrorCode  DMDALocalToLocalBegin(DM da,Vec g,InsertMode mode,Vec l)

Neighbor-wise Collective on DMDA and Vec

Input Parameters

	da	- the distributed array context
	g	- the original local vector
	mode	- one of INSERT_VALUES or ADD_VALUES

Output Parameter

l -the local vector with correct ghost values

Notes

The local vectors used here need not be the same as those obtained from DMCreateLocalVector(), BUT they must have the same parallel data layout; they could, for example, be obtained with VecDuplicate() from the DMDA originating vectors.

Keywords