# DMTSSetRHSFunction
set TS explicit residual evaluation function 
## Synopsis
```
#include "petscts.h" 
PetscErrorCode DMTSSetRHSFunction(DM dm, TSRHSFunction func, void *ctx)
```
Not Collective


## Input Parameters

- ***dm -*** DM to be used with TS
- ***func -*** RHS function evaluation routine
- ***ctx -*** context for residual evaluation



## Calling sequence of func
```none
PetscErrorCode func(TS ts,PetscReal t,Vec u,Vec F,void *ctx);
```


- ***ts -*** timestep context
- ***t -*** current timestep
- ***u -*** input vector
- ***F -*** function vector
- ***ctx -*** [optional] user-defined function context





## Note
TSSetRHSFunction() is normally used, but it calls this function internally because the user context is actually
associated with the DM.  This makes the interface consistent regardless of whether the user interacts with a DM or
not. If DM took a more central role at some later date, this could become the primary method of setting the residual.


## See Also
 `DMTSSetContext()`, `TSSetRHSFunction()`, `DMTSSetJacobian()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ts/utils/dmts.c.html#DMTSSetRHSFunction">src/ts/utils/dmts.c</A>


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


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