# VecStrideScale

Scales a subvector of a vector defined by a starting point and a stride.

### Synopsis

    #include "petscvec.h"
    PetscErrorCode PETSCVEC_DLLEXPORT VecStrideScale(Vec v,PetscInt start,PetscScalar *scale)

Collective on Vec

### Input Parameter

| v | - the vector
| start | - starting point of the subvector (defined by a stride)
| scale | - value to multiply each subvector entry by

### C++ variants

| VecStrideScale(Vec x,PetscInt i,PetscScalar _t) |  | -> |  | VecStrideScale(x,i,&_T)

### Notes

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

This will only work if the desire subvector is a stride subvector

### See Also

VecNorm(), VecStrideGather(), VecStrideScatter(), VecStrideMin(), VecStrideMax(), VecStrideScale()

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