DMStagVecSetValuesStencil

Set Vec values using global grid indexing

Synopsis

#include "petscdmstag.h"   
PetscErrorCode DMStagVecSetValuesStencil(DM dm, Vec vec, PetscInt n, const DMStagStencil *pos, const PetscScalar *val, InsertMode insertMode)

Not Collective

Input Parameters

• dm - the DMSTAG object

• vec - the Vec

• n - the number of values to set

• pos - the locations to set values, as an array of DMStagStencil structs

• val - the values to set

• insertMode - INSERT_VALUES or ADD_VALUES

Notes

The vector is expected to be a global vector compatible with the DM (usually obtained by DMGetGlobalVector() or DMCreateGlobalVector()).

This approach is not as efficient as setting values directly with DMStagVecGetArray(), which is recommended for matrix-free operators. For assembling systems, where overhead may be less important than convenience, this routine could be helpful in assembling a righthand side and a matrix (using DMStagMatSetValuesStencil()).

See Also

DMSTAG: Staggered, Structured Grid, DMSTAG, Vec, DMStagStencil, DMStagStencilLocation, DMStagVecGetValuesStencil(), DMStagMatSetValuesStencil(), DMCreateGlobalVector(), DMGetLocalVector(), DMStagVecGetArray()

Level

advanced

Location

src/dm/impls/stag/stagstencil.c

Examples

src/dm/impls/stag/tutorials/ex3.c
src/dm/impls/stag/tutorials/ex8.c
src/dm/impls/stag/tutorials/ex2.c
src/dm/impls/stag/tutorials/ex1.c
src/dm/impls/stag/tutorials/ex4.c
src/dm/impls/stag/tutorials/ex6.c

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Index of all DMStag routines
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