petsc-3.9.4 2018-09-11
DMLocalToGlobalBegin
updates global vectors from local vectors
Synopsis
#include "petscdm.h"
#include "petscdmlabel.h"
#include "petscds.h"
PetscErrorCode DMLocalToGlobalBegin(DM dm,Vec l,InsertMode mode,Vec g)
Neighbor-wise Collective on DM
Input Parameters
| dm | - the DM object
|
| l | - the local vector
|
| mode | - if INSERT_VALUES then no parallel communication is used, if ADD_VALUES then all ghost points from the same base point accumulate into that base point.
|
| g | - the global vector
|
Notes: In the ADD_VALUES case you normally would zero the receiving vector before beginning this operation.
INSERT_VALUES is not supported for DMDA, in that case simply compute the values directly into a global vector instead of a local one.
See Also
DMCoarsen(), DMDestroy(), DMView(), DMCreateGlobalVector(), DMCreateInterpolation(), DMGlobalToLocalEnd(), DMGlobalToLocalBegin()
Level
beginner
Location
src/dm/interface/dm.c
Examples
src/dm/examples/tutorials/ex1.c.html
src/dm/examples/tutorials/ex5.c.html
src/dm/examples/tutorials/ex7.c.html
src/dm/examples/tutorials/ex9.c.html
src/ksp/ksp/examples/tutorials/ex42.c.html
src/ksp/ksp/examples/tutorials/ex43.c.html
src/ksp/ksp/examples/tutorials/ex49.c.html
src/ksp/ksp/examples/tutorials/ex69.c.html
src/ksp/ksp/examples/tutorials/ex70.c.html
src/snes/examples/tutorials/ex5.c.html
src/snes/examples/tutorials/ex15.c.html
Implementations
DMLocalToGlobalBegin_Composite in src/dm/impls/composite/pack.c
DMLocalToGlobalBegin_DA in src/dm/impls/da/dagtol.c
DMLocalToGlobalBegin_Moab in src/dm/impls/moab/dmmbvec.cxx
DMLocalToGlobalBegin_Network in src/dm/impls/network/network.c
DMLocalToGlobalBegin_Redundant in src/dm/impls/redundant/dmredundant.c
Index of all DM routines
Table of Contents for all manual pages
Index of all manual pages