petsc-3.10.5 2019-03-28
Report Typos and Errors

# VecStrideSubSetScatter

Scatters components from a vector into a subset of components of a multi-component vector.

### Synopsis

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

Collective on Vec

### Input Parameter

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

### Output Parameter

v -the location where the subvector is into scattered (the multi-component vector)

### Notes

One must call VecSetBlockSize() on the 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(), VecStrideGather(), VecStrideGather(), VecStrideSubSetGather(), 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