# DMTSSetIJacobian
set `TS` Jacobian evaluation function 
## Synopsis
```
#include "petscts.h" 
PetscErrorCode DMTSSetIJacobian(DM dm, TSIJacobian 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 f
```none
PetscErrorCode f(TS ts,PetscReal t,Vec U,Vec U_t,PetscReal a,Mat Amat,Mat Pmat,void *ctx);
```


- ***t    -*** time at step/stage being solved
- ***U    -*** state vector
- ***U_t  -*** time derivative of state vector
- ***a    -*** shift
- ***Amat -*** (approximate) Jacobian of F(t,U,W+a*U), equivalent to dF/dU + a*dF/dU_t
- ***Pmat -*** matrix used for constructing preconditioner, 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. If `DM` took a more central role at some later date, this could become the primary method of setting the Jacobian.


## See Also
 [](chapter_ts), `TS`, `DM`, `DMTSSetContext()`, `TSSetRHSFunction()`, `DMTSGetJacobian()`, `TSSetIJacobian()`, `TSSetIFunction()`

## Level
advanced

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


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