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# TSAdjointMonitorSet
Sets an ADDITIONAL function that is to be used at every timestep to display the iteration's  progress. 
## Synopsis
```
#include "petscts.h"  
PetscErrorCode TSAdjointMonitorSet(TS ts, PetscErrorCode (*adjointmonitor)(TS, PetscInt, PetscReal, Vec, PetscInt, Vec *, Vec *, void *), void *adjointmctx, PetscErrorCode (*adjointmdestroy)(void **))
```
Logically Collective


## Input Parameters

- ***ts -*** the `TS` context obtained from `TSCreate()`
- ***adjointmonitor -*** monitoring routine
- ***adjointmctx -*** [optional] user-defined context for private data for the
monitor routine (use `NULL` if no context is desired)
- ***adjointmonitordestroy -*** [optional] routine that frees monitor context
(may be `NULL`)



## Calling sequence of `adjointmonitor`
```none
PetscErrorCode adjointmonitor(TS ts, PetscInt steps, PetscReal time, Vec u, PetscInt numcost, Vec *lambda, Vec *mu, void *adjointmctx)
```

- ***ts -*** the `TS` context
- ***steps -*** iteration number (after the final time step the monitor routine is called with a step of -1, this is at the final time which may have
been interpolated to)
- ***time -*** current time
- ***u -*** current iterate
- ***numcost -*** number of cost functionos
- ***lambda -*** sensitivities to initial conditions
- ***mu -*** sensitivities to parameters
- ***adjointmctx -*** [optional] adjoint monitoring context





## Note
This routine adds an additional monitor to the list of monitors that
already has been loaded.


## Fortran Note
Only a single monitor function can be set for each `TS` object


## See Also
 [](ch_ts), `TS`, `TSAdjointSolve()`, `TSAdjointMonitorCancel()`

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ts/interface/sensitivity/tssen.c.html#TSAdjointMonitorSet">src/ts/interface/sensitivity/tssen.c</A>

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ts/tutorials/ex20td.c.html">src/ts/tutorials/ex20td.c</A><BR>


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


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