How to output and save x1 and x2 after each run / generation?

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Emily Senay 2015-6-25

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https://ww2.mathworks.cn/matlabcentral/answers/225350-how-to-output-and-save-x1-and-x2-after-each-run-generation

评论： Alan Weiss 2015-6-29

I am using the genetic algorithm with a two variable function. I am running gaoptimeset and ga in a loop of a specified number. I want to get the value of x1 and x2 for each generation that the program is ran in one loop. How do I do this? I want to see how the values of x1 and x2 converge to the solution.

Thanks

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Answer 1

Alan Weiss 2015-6-25

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https://ww2.mathworks.cn/matlabcentral/answers/225350-how-to-output-and-save-x1-and-x2-after-each-run-generation#answer_184043

Use an Output Function. For an example (using different solver and syntax, be careful!), see Output Functions in the Optimization Toolbox documentation.

Alan Weiss

MATLAB mathematical toolbox documentation

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Emily Senay 2015-6-26

okay but if I want to output the best fitness function value for the first generation and the last, how do I do that? I would like to call them best1 and best2 so that at the end i can take the difference.

Alan Weiss 2015-6-29

You can get the population at each generation in the state.Population field. See The State Structure. ga passes the state structure to your output function.

Alan Weiss

MATLAB mathematical toolbox documentation

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