How to write non linear constraint function in a genetic algorithm optimization toolbox?

I want to use optimization tool box to solve a problem using GA as a solver. But in the toolbox window i have to insert the constraint function, that i don't know how to write. I am using Matlab 7.8.0.347 (R2009a) version.

Answer 1

[Walter Roberson]

http://www.mathworks.com/help/gads/ga.html#inputarg_nonlcon

There is no particular way to write the nonlinear constraint function. It accepts a vector of input values and returns two row vectors of output values (neither of which needs to be the same size as x). In the first output, return one value for each distinct constraint, and the constraints will be considered to be met if all of those values are less than or equal to 0. For the second output, return one value for each distinct constraint, and the constraints will be considered to be met if all of those values are equal to 0.

How you calculate those values is up to you. You can use logical conditions to test ranges. You can use math. You can use image processing tools, whatever you can think of.

Answer 2

[Alan Weiss]

The documentation for writing nonlinear constraints is here. For ga in particular, there is an example here that uses nonlinear constraints.

Alan Weiss

MATLAB mathematical toolbox documentation

[Raju Das]

Thanks Alan it was helpful.