Genetic algorithm: child out of constraints

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dimitris 2012-5-27

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I have set the linear inequality constraints of the GA in a way that each gene is smaller than the next one, eg x1<x2<x3...<xn but in some cases i see that this rule is not followed. Although i have read the relative documentation i am not sure if the genetic algorithm allows chromosomes out of the constraints and if so, how can i eliminate these chromosomes.

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dimitris 2012-5-29

I am using Matlab R2011b and i am calling GA inside a function.

Oleg Komarov 2012-5-29

http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer

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Alan Weiss 2012-6-6

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If your problem is that the inequalities are not being strictly satisfied, but are being satisfied within sqrt(TolCon), then I am afraid that you are asking too much. The genetic algorithm does not satisfy linear inequalities strictly, but only within a certain numeric tolerance.

You can set a smaller value of TolCon if you like, but do not set it smaller than eps, or, in my opinion, even 100*eps.

Alan Weiss

MATLAB mathematical toolbox documentation