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# VecStrideScale
Scales a subvector of a vector defined by a starting point and a stride. 
## Synopsis
```
#include "petscvec.h" 
PetscErrorCode VecStrideScale(Vec v, PetscInt start, PetscScalar scale)
```
Logically Collective


## Input Parameters

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





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

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


## See Also
 `Vec`, `VecNorm()`, `VecStrideGather()`, `VecStrideScatter()`, `VecStrideMin()`, `VecStrideMax()`, `VecStrideScale()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/vec/utils/vinv.c.html#VecStrideScale">src/vec/vec/utils/vinv.c</A>

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/vec/tutorials/ex13.c.html">src/vec/vec/tutorials/ex13.c</A><BR>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/vec/vec/utils/vinv.c)


[Index of all Vec routines](index.md)  
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[Index of all manual pages](/manualpages/singleindex.md)