Learn more about Genetic Algorithm and Direct Search Toolbox

Version 2.1 (R2007a) Genetic Algorithm and Direct Search Toolbox Software

This table summarizes what's new in version 2.1 (R2007a):

New Features and Changes	Version Compatibility Considerations	Fixed Bugs and Known Problems	Related Documentation at Web Site
Yes Details below	Yes–Details labeled as Compatibility Considerations, below. See also Summary.	Bug Reports Includes fixes	None

New features and changes introduced in this version are described here:

• New Functions for Simulated Annealing and Threshold Acceptance

• ga Output Argument exitflag Returns Numeric Value

New Functions for Simulated Annealing and Threshold Acceptance

The following functions have been added for simulated annealing and threshold acceptance:

simulannealbnd	Perform unconstrained or bound-constrained minimization of a function of several variables using simulated annealing. The default algorithm uses adaptive annealing, but options can be changed to use Boltzmann annealing, fast annealing, and other variants.
threshacceptbnd	Perform unconstrained or bound-constrained minimization of a function of several variables using threshold acceptance.
saoptimset	Create or modify optimization options for simulannealbnd or threshacceptbnd.
saoptimget	Access options for simulannealbnd or threshacceptbnd.

If you are viewing this documentation in the Help browser, the following demos are available:

• Minimization Using Simulated Annealing And Threshold Acceptance Algorithms

• Simulated Annealing and Threshold Acceptance Options

• Custom Data Type Optimization Using Simulated Annealing

ga Output Argument exitflag Returns Numeric Value

The third output argument returned by the ga function is now a numeric value. This change is consistent with other optimization solvers in MATLAB and makes it easier to programmatically determine the reason the solver stopped. As in previous versions, the fourth output argument is a structure with the field message containing a string that indicates the reason the solver stopped.

The new syntax is as follows:

[x,fval,exitflag,output] = ga(fitnessfcn, ...)

For more information, including a description of the messages that correspond to the numeric values for each exitflag value, see the ga function reference page in the Genetic Algorithm and Direct Search Toolbox User's Guide for more information.

Compatibility Considerations

In previous versions, the third output argument returned by ga is a string describing the reason the solver stopped.

[x,fval,reason] = ga(fitnessfcn, ...)

If you used the third output argument of the ga function programmatically in a previous release, for example, to compare the value to a string, this code will now produce an error.

Version 2.2 (R2007b) Genetic Algorithm and Direct Search Toolbox Software

Version 2.0.2 (R2006b) Genetic Algorithm and Direct Search Toolbox Software

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