petsc-3.7.7 2017-09-25

DMDAGlobalToNaturalBegin

Maps values from the global vector to a global vector in the "natural" grid ordering. Must be followed by DMDAGlobalToNaturalEnd() to complete the exchange.

Synopsis

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

Neighbor-wise Collective on DMDA

Input Parameters

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

Output Parameter

l -the natural ordering values

Notes

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

You must call DMDACreateNaturalVector() before using this routine

Keywords