petsc-3.11.4 2019-09-28
DMStagVecSetValuesStencil
Set Vec values using global grid indexing
Synopsis
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 DMStagVecGetArrayDOF(), 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, DMStagStencil, DMStagStencilLocation, DMStagVecGetValuesStencil(), DMStagMatSetValuesStencil(), DMCreateGlobalVector(), DMGetLocalVector(), DMStagVecGetArrayDOF()
Level
advanced
Location
src/dm/impls/stag/stagstencil.c
Examples
src/dm/impls/stag/examples/tutorials/ex1.c.html
src/dm/impls/stag/examples/tutorials/ex2.c.html
src/dm/impls/stag/examples/tutorials/ex3.c.html
src/dm/impls/stag/examples/tutorials/ex4.c.html
Index of all DMSTAG routines
Table of Contents for all manual pages
Index of all manual pages