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# TaoSetEqualityConstraintsRoutine
Sets a function to be used to compute constraints.  Tao only handles constraints under certain conditions, see [](ch_tao) for details 
## Synopsis
```
#include "petsctao.h" 
PetscErrorCode TaoSetEqualityConstraintsRoutine(Tao tao, Vec ce, PetscErrorCode (*func)(Tao, Vec, Vec, void *), void *ctx)
```
Logically Collective


## Input Parameters

- ***tao -*** the `Tao` context
- ***ce   -*** A vector that will be used to store equality constraint evaluation
- ***func -*** the bounds computation routine
- ***ctx -*** [optional] user-defined context for private data for the equality constraints computation (may be `NULL`)



## Calling sequence of `func`
```none
PetscErrorCode func(Tao tao, Vec x, Vec ce, void *ctx);
```

- ***tao -*** the `Tao` solver
- ***x   -*** point to evaluate equality constraints
- ***ce   -*** vector of equality constraints evaluated at x
- ***ctx -*** the (optional) user-defined function context





## See Also
 [](ch_tao), `Tao`, `TaoSetObjective()`, `TaoSetHessian()`, `TaoSetObjectiveAndGradient()`, `TaoSetVariableBounds()`

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/tao/interface/taosolver_bounds.c.html#TaoSetEqualityConstraintsRoutine">src/tao/interface/taosolver_bounds.c</A>

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/tao/constrained/tutorials/ex1.c.html">src/tao/constrained/tutorials/ex1.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/tao/constrained/tutorials/maros.c.html">src/tao/constrained/tutorials/maros.c</A><BR>


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


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