# DMDAGetGhostCorners#

Returns the global (x,y,z) indices of the lower left corner and size of the local region, including ghost points.

## Synopsis#

#include "petscdmda.h"
PetscErrorCode DMDAGetGhostCorners(DM da, PetscInt *x, PetscInt *y, PetscInt *z, PetscInt *m, PetscInt *n, PetscInt *p)


Not Collective

## Input Parameter#

• da - the distributed array

## Output Parameters#

• x - the corner index for the first dimension

• y - the corner index for the second dimension (only used in 2D and 3D problems)

• z - the corner index for the third dimension (only used in 3D problems)

• m - the width in the first dimension

• n - the width in the second dimension (only used in 2D and 3D problems)

• p - the width in the third dimension (only used in 3D problems)

## Note#

The corner information is independent of the number of degrees of freedom per node set with the DMDACreateXX() routine. Thus the x, y, z, and m, n, p can be thought of as coordinates on a logical grid, where each grid point has (potentially) several degrees of freedom. Any of y, z, n, and p can be passed in as NULL if not needed.

DM, DMDA, DMDAGetCorners(), DMDACreate1d(), DMDACreate2d(), DMDACreate3d(), DMDAGetOwnershipRanges(), DMStagGetGhostCorners()

beginner

## Location#

src/dm/impls/da/daghost.c

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