# TSSetPreStep
Sets the general-purpose function called once at the beginning of each time step. 
## Synopsis
```
#include "petscts.h"  
PetscErrorCode TSSetPreStep(TS ts, PetscErrorCode (*func)(TS))
```
Logically Collective


## Input Parameters

- ***ts   -*** The `TS` context obtained from `TSCreate()`
- ***func -*** The function



## Calling sequence of func
```none
  PetscErrorCode func (TS ts);
```





## See Also
 [](chapter_ts), `TS`, `TSSetPreStage()`, `TSSetPostStage()`, `TSSetPostStep()`, `TSStep()`, `TSRestartStep()`

## Level
intermediate

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

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ts/tutorials/ex76.c.html">src/ts/tutorials/ex76.c.html</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ts/tutorials/ex77.c.html">src/ts/tutorials/ex77.c.html</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ts/utils/dmplexlandau/tutorials/ex2.c.html">src/ts/utils/dmplexlandau/tutorials/ex2.c.html</A><BR>


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