petsc-3.7.5 2017-01-01
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VecStrideSubSetGather

 Gathers a subset of components from a multi-component vector into another vector.

Synopsis

#include "petscvec.h" 
PetscErrorCode  VecStrideSubSetGather(Vec v,PetscInt nidx,const PetscInt idxv[],const PetscInt idxs[],Vec s,InsertMode addv)
Collective on Vec

Input Parameter

v - the vector
nidx - the number of indices
idxv - the indices of the components 0 <= idxv[0] ...idxv[nidx-1] < bs(v), they need not be sorted
idxs - the indices of the components 0 <= idxs[0] ...idxs[nidx-1] < bs(s), they need not be sorted, may be null if nidx == bs(s) or is PETSC_DETERMINE
addv - one of ADD_VALUES,INSERT_VALUES,MAX_VALUES

Output Parameter

s -the location where the subvector is stored

Notes

One must call VecSetBlockSize() on both vectors before this routine to set the stride information, or use a vector created from a multicomponent DMDA.

The parallel layout of the vector and the subvector must be the same;

Not optimized; could be easily

See Also

VecStrideNorm(), VecStrideScatter(), VecStrideGather(), VecStrideSubSetScatter(), VecStrideMin(), VecStrideMax(), VecStrideGatherAll(),
VecStrideScatterAll()

Level:advanced
Location:src/vec/vec/utils/vinv.c
Index of all Vec routines
Table of Contents for all manual pages
Index of all manual pages