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# DMDASNESSetFunctionLocalVec
set a local residual evaluation function that operates on a local vector for `DMDA` 
## Synopsis
```
#include "petscdmda.h" 
#include "petscsnes.h" 
PetscErrorCode DMDASNESSetFunctionLocalVec(DM dm, InsertMode imode, PetscErrorCode (*func)(DMDALocalInfo *, Vec, Vec, void *), void *ctx)
```
Logically Collective


## Input Parameters

- ***dm -*** `DM` to associate callback with
- ***imode -*** `INSERT_VALUES` if local function computes owned part, `ADD_VALUES` if it contributes to ghosted part
- ***func -*** local residual evaluation
- ***ctx -*** optional context for local residual evaluation



## Calling sequence of `func`
```none
PetscErrorCode func(DMDALocalInfo *info, Vec x, Vec f, void *ctx),
```

- ***info -*** `DMDALocalInfo` defining the subdomain to evaluate the residual on
- ***x -*** state vector at which to evaluate residual
- ***f -*** residual vector
- ***ctx -*** optional context passed above





## See Also
 `DMDA`, `DMDASNESSetFunctionLocal()`, `DMDASNESSetJacobianLocalVec()`, `DMSNESSetFunction()`, `DMDACreate1d()`, `DMDACreate2d()`, `DMDACreate3d()`

## Level
beginner

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/snes/utils/dmdasnes.c.html#DMDASNESSetFunctionLocalVec">src/snes/utils/dmdasnes.c</A>

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/snes/tutorials/ex55.c.html">src/snes/tutorials/ex55.c</A><BR>


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


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