:orphan:
# VecScale
Scales a vector.
## Synopsis
```
#include "petscvec.h"
PetscErrorCode VecScale(Vec x, PetscScalar alpha)
```
Not Collective
## Input Parameters
- ***x -*** the vector
- ***alpha -*** the scalar
## Note
For a vector with n components, `VecScale()` computes x[i] = alpha * x[i], for i=1,...,n.
## See Also
[](ch_vectors), `Vec`, `VecSet()`
## Level
intermediate
## Location
src/vec/vec/interface/rvector.c
## Examples
src/dm/impls/stag/tutorials/ex2.c
src/dm/impls/stag/tutorials/ex3.c
src/dm/impls/stag/tutorials/ex4.c
src/dm/tutorials/ex1.c
src/dm/tutorials/ex7.c
src/dm/tutorials/ex9.c
src/ksp/ksp/tutorials/ex28.c
src/ksp/ksp/tutorials/ex49.c
src/ksp/ksp/tutorials/ex59.c
src/ksp/ksp/tutorials/ex60.c
src/mat/tutorials/ex9.c
## Implementations
VecScale_Nest in src/vec/vec/impls/nest/vecnest.c
VecScale_Seq in src/vec/vec/impls/seq/bvec1.c
VecScale_SeqKokkos in src/vec/vec/impls/seq/kokkos/veckok.kokkos.cxx
VecScale_SeqViennaCL in src/vec/vec/impls/seq/seqviennacl/vecviennacl.cxx
---
[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/vec/vec/interface/rvector.c)
[Index of all Vec routines](index.md)
[Table of Contents for all manual pages](/manualpages/index.md)
[Index of all manual pages](/manualpages/singleindex.md)