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# VecSetValueLocal
Set a single entry into a vector using the local numbering, see `VecSetValuesLocal()` 
## Synopsis
```
#include <petscvec.h>
PetscErrorCode VecSetValueLocal(Vec v,PetscInt row,PetscScalar value, InsertMode mode);
```
Not Collective


## Input Parameters

- ***v -*** the vector
- ***row -*** the row location of the entry
- ***value -*** the value to insert
- ***mode -*** either `INSERT_VALUES` or `ADD_VALUES`





## Notes
For efficiency one should use `VecSetValuesLocal()` and set several or
many values simultaneously if possible.

These values may be cached, so `VecAssemblyBegin()` and `VecAssemblyEnd()`
MUST be called after all calls to `VecSetValueLocal()` have been completed.

`VecSetValues()` uses 0-based indices in Fortran as well as in C.


## See Also
 [](ch_vectors), `VecSetValuesLocal()`, `VecSetValues()`, `VecAssemblyBegin()`, `VecAssemblyEnd()`, `VecSetValuesBlockedLocal()`, `VecSetValue()`

## Level
beginner

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/include/petscvec.h.html#VecSetValueLocal">include/petscvec.h</A>


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