# Documentation/Modules/ConstraintHandler: Unterschied zwischen den Versionen

## Summary

Some optimization problems define objectives as well as constraints.

For example, one can set for the optimization problem `ProblemTruss ` the weight of the truss to be minimized, while a constraint is set on the maximum stress and displacement of the truss.

This module aggregates objectives and constraints into a single output.

## Properties

### General

 Algorithm deterministic (as no gradient handling is implemented) continuous variables, discrete or mixed variables are possible. any number any number Design variables values outside the boundaries are corrected not affected not affected not required

### Connections

 Starting at his module One connection of type `optimization` One connection of type `optimization`

Name Description
- -

### Options

The options are currently described as "pop-up help".

## Module Description

The optimization algorithm proposes one or several new solutions x. Some values of x might be outside the lower bounds xl and upper bounds xu, specified in the "Problem" module. These variables are corrected to values within the bounds by thress different methods:

0. no bound handling

This option turns off the bound handling.

1. set to bounds

If one of the variables x is below or above the bounds, it is set to the bound value, i.e.

```   if x < xl, then x = xl
else if x > xu, then x = xu
```

2. reflect

If one of the variables x is below or above the bounds, it is reflected from the bound. The reflection is done such that if x goes to infinity, x is equal to the lower bound and if x goes to minus infinity, it is set to the upper bound.

```   if x < xl, then x = xu + (xl- xu)^2 / (x - xu)
```
```   else if x > xu, then x = xl + (xu- xl)^2 / (x - xl)
```

-