VecScatterCreateToZero#
Creates an output vector and a scatter context used to copy all vector values into the output vector on the zeroth processor
Synopsis#
#include "petscsf.h"
PetscErrorCode VecScatterCreateToZero(Vec vin, VecScatter *ctx, Vec *vout)
Collective
Input Parameter#
vin -
Vecof typeMPIVEC
Output Parameters#
ctx - scatter context
vout - output
SEQVECthat is large enough to scatter into on processor 0 and of length zero on all other processors
Usage#
VecScatterCreateToZero(vin,&ctx,&vout);
// scatter as many times as you need
VecScatterBegin(ctx,vin,vout,INSERT_VALUES,SCATTER_FORWARD);
VecScatterEnd(ctx,vin,vout,INSERT_VALUES,SCATTER_FORWARD);
// destroy scatter context and local vector when no longer needed
VecScatterDestroy(&ctx);
VecDestroy(&vout);
Notes#
vout may be NULL [PETSC_NULL_VEC from fortran] if you do not
need to have it created
Do NOT create a vector and then pass it in as the final argument vout! vout is created by this routine
automatically (unless you pass NULL in for that argument if you do not need it).
See Also#
Low-level Vector Communication, VecScatter, VecScatterCreate(), VecScatterCreateToAll(), VecScatterBegin(), VecScatterEnd()
Level#
intermediate
Location#
Examples#
src/tao/constrained/tutorials/ex1.c
Index of all PetscSF routines
Table of Contents for all manual pages
Index of all manual pages