# 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 n)


Neighbor-wise Collective on da

## 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

DM, DMDA, DMDAGlobalToNaturalEnd(), DMLocalToGlobalBegin(), DMDACreate2d(), DMGlobalToLocalBegin(), DMGlobalToLocalEnd(), DMDACreateNaturalVector()