PETSc version 3.17.4
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# DMStagGetCorners

return global element indices of the local region (excluding ghost points)

### Synopsis

    PetscErrorCode DMStagGetCorners(DM dm,PetscInt *x,PetscInt *y,PetscInt *z,PetscInt *m,PetscInt *n,PetscInt *p,PetscInt *nExtrax,PetscInt *nExtray,PetscInt *nExtraz)

Not Collective

### Input Parameter

| dm | - the DMStag object

### Output Parameters

| x | - starting element index in first direction
| y | - starting element index in second direction
| z | - starting element index in third direction
| m | - element width in first direction
| n | - element width in second direction
| p | - element width in third direction
| nExtrax | - number of extra partial elements in first direction
| nExtray | - number of extra partial elements in second direction
| nExtraz | - number of extra partial elements in third direction

### Notes

Arguments corresponding to higher dimensions are ignored for 1D and 2D grids. These arguments may be set to NULL in this case.

The number of extra partial elements is either 1 or 0. The value is 1 on right, top, and front non-periodic domain ("physical") boundaries, in the x, y, and z directions respectively, and otherwise 0.

### See Also

DMSTAG, DMStagGetGhostCorners(), DMDAGetCorners()

### Level

beginner

### Location

src/dm/impls/stag/stagutils.c

### Examples

src/dm/impls/stag/tutorials/ex1.c.html
src/dm/impls/stag/tutorials/ex2.c.html
src/dm/impls/stag/tutorials/ex3.c.html
src/dm/impls/stag/tutorials/ex4.c.html
src/dm/impls/stag/tutorials/ex6.c.html
Index of all DMSTAG routines
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Index of all manual pages