# Documentation

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## Simulated Annealing Terminology

### Objective Function

The objective function is the function you want to optimize. Global Optimization Toolbox algorithms attempt to find the minimum of the objective function. Write the objective function as a file or anonymous function, and pass it to the solver as a function handle. For more information, see Compute Objective Functions and Create Function Handle (MATLAB).

### Temperature

The temperature is a parameter in simulated annealing that affects two aspects of the algorithm:

Temperature can be a vector with different values for each component of the current point. Typically, the initial temperature is a scalar.

Temperature decreases gradually as the algorithm proceeds. You can specify the initial temperature as a positive scalar or vector in the `InitialTemperature` option. You can specify the temperature as a function of iteration number as a function handle in the `TemperatureFcn` option. The temperature is a function of the Annealing Parameter, which is a proxy for the iteration number. The slower the rate of temperature decrease, the better the chances are of finding an optimal solution, but the longer the run time. For a list of built-in temperature functions and the syntax of a custom temperature function, see Temperature Options.

### Annealing Parameter

The annealing parameter is a proxy for the iteration number. The algorithm can raise temperature by setting the annealing parameter to a lower value than the current iteration. (See Reannealing.) You can specify the temperature schedule as a function handle with the `TemperatureFcn` option.

### Reannealing

Annealing is the technique of closely controlling the temperature when cooling a material to ensure that it reaches an optimal state. Reannealing raises the temperature after the algorithm accepts a certain number of new points, and starts the search again at the higher temperature. Reannealing avoids the algorithm getting caught at local minima. Specify the reannealing schedule with the `ReannealInterval` option.