# TSComputeExactError
Compute the solution error for the timestepping using the function previously set with `TSSetComputeExactError()` 
## Synopsis
```
#include "petscts.h"  
PetscErrorCode TSComputeExactError(TS ts, Vec u, Vec e)
```
Collective on ts


## Input Parameters

- ***ts -*** time stepping context
- ***u  -*** The approximate solution
- ***e  -*** The `Vec` used to store the error





## See Also
 [](chapter_ts), `TS`, `TSGetComputeInitialCondition()`, `TSSetComputeInitialCondition()`, `TSSolve()`

## Level
advanced

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


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