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# VecSetFromOptions
Configures the vector from the options database.
## Synopsis
```
#include "petscvec.h"
PetscErrorCode VecSetFromOptions(Vec vec)
```
Collective
## Input Parameter
- ***vec -*** The vector
## Notes
To see all options, run your program with the -help option.
Must be called after `VecCreate()` but before the vector is used.
## See Also
[](ch_vectors), `Vec`, `VecCreate()`, `VecSetOptionsPrefix()`
## Level
beginner
## Location
src/vec/vec/interface/vector.c
## Examples
src/dm/tutorials/ex14.c
src/ksp/ksp/tutorials/bench_kspsolve.c
src/ksp/ksp/tutorials/ex1.c
src/ksp/ksp/tutorials/ex10.c
src/ksp/ksp/tutorials/ex11.c
src/ksp/ksp/tutorials/ex11f.F90
src/ksp/ksp/tutorials/ex12.c
src/ksp/ksp/tutorials/ex15.c
src/ksp/ksp/tutorials/ex16.c
src/ksp/ksp/tutorials/ex18.c
src/ksp/ksp/tutorials/ex1f.F90
## Implementations
VecSetFromOptions_MPI in src/vec/vec/impls/mpi/pbvec.c
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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/vec/vec/interface/vector.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)