:orphan:
# DMTSSetRHSJacobian
set `TS` Jacobian evaluation function 
## Synopsis
```
#include "petscts.h" 
PetscErrorCode DMTSSetRHSJacobian(DM dm, TSRHSJacobian func, void *ctx)
```
Not Collective


## Input Parameters

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



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

- ***ts  -*** the `TS` context obtained from `TSCreate()`
- ***t -*** current timestep
- ***u -*** input vector
- ***Amat -*** (approximate) Jacobian matrix
- ***Pmat -*** matrix from which preconditioner is to be constructed (usually the same as Amat)
- ***ctx -*** [optional] user-defined context for matrix evaluation routine





## Note
`TSSetJacobian()` 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.


## Developer Note
If `DM` took a more central role at some later date, this could become the primary method of setting the Jacobian.


## See Also
 [](ch_ts), `DMTSSetContext()`, `TSSetFunction()`, `DMTSGetJacobian()`, `TSSetRHSJacobian()`

## Level
advanced

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


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


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