petsc-3.14.5 2021-03-03
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# DMDAGetElements

Gets an array containing the indices (in local coordinates) of all the local elements

### Synopsis

    #include "petscdmda.h"
    PetscErrorCode  DMDAGetElements(DM dm,PetscInt *nel,PetscInt *nen,const PetscInt *e[])

Not Collective

### Input Parameter

| dm | - the DM object

### Output Parameters

| nel | - number of local elements
| nen | - number of element nodes
| e | - the local indices of the elements' vertices

### Notes

Call DMDARestoreElements() once you have finished accessing the elements.

Each process uniquely owns a subset of the elements. That is no element is owned by two or more processes.

If on each process you integrate over its owned elements and use ADD_VALUES in Vec/MatSetValuesLocal() then you'll obtain the correct result.

Not supported in Fortran

### See Also

DMDAElementType, DMDASetElementType(), VecSetValuesLocal(), MatSetValuesLocal(), DMGlobalToLocalBegin(), DMLocalToGlobalBegin()

### Level

intermediate

### Location

src/dm/impls/da/dagetelem.c

### Examples

src/dm/tutorials/ex5.c.html
src/ksp/ksp/tutorials/ex70.c.html
src/ksp/ksp/tutorials/ex71.c.html

### Implementations

DMDAGetElements_1D in src/dm/impls/da/dagetelem.c
DMDAGetElements_2D in src/dm/impls/da/dagetelem.c
DMDAGetElements_3D in src/dm/impls/da/dagetelem.c
Index of all DMDA routines
Table of Contents for all manual pages
Index of all manual pages