# VecSet#

Sets all components of a vector to a single scalar value.

## Synopsis#

```
#include "petscvec.h"
PetscErrorCode VecSet(Vec x, PetscScalar alpha)
```

Logically Collective on Vec

## Input Parameters#

the vector**x -**the scalar**alpha -**

## Output Parameter#

the vector**x -**

## Note#

For a vector of dimension n, VecSet() computes

```
x[i] = alpha, for i=1,...,n,
```

so that all vector entries then equal the identical scalar value, alpha. Use the more general routine VecSetValues() to set different vector entries.

You CANNOT call this after you have called VecSetValues() but before you call VecAssemblyBegin/End().

## See Also#

## Level#

beginner

## Location#

## Examples#

src/vec/vec/tutorials/ex11.c.html

src/vec/vec/tutorials/ex11f90.F90.html

src/vec/vec/tutorials/ex11f.F90.html

src/vec/vec/tutorials/ex12.c.html

src/vec/vec/tutorials/ex12f.F90.html

src/vec/vec/tutorials/ex13.c.html

src/vec/vec/tutorials/ex15.c.html

src/vec/vec/tutorials/ex18.c.html

src/vec/vec/tutorials/ex18f.F90.html

src/vec/vec/tutorials/ex1.c.html

src/vec/vec/tutorials/ex1f90.F90.html

## Implementations#

VecSet_Nest in src/vec/vec/impls/nest/vecnest.c

{
VecSet_Seq in src/vec/vec/impls/seq/dvec2.c

{
VecSet_SeqKokkos in src/vec/vec/impls/seq/kokkos/veckok.kokkos.cxx

{
VecSet_SeqCUDA in src/vec/vec/impls/seq/seqcuda/veccuda2.cu

{
VecSet_SeqHIP in src/vec/vec/impls/seq/seqhip/vechip2.hip.c

{
VecSet_SeqViennaCL in src/vec/vec/impls/seq/seqviennacl/vecviennacl.cxx

{

Index of all Vec routines

Table of Contents for all manual pages

Index of all manual pages