How would I get Maximization curve in GA in Matlab?
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SUMAN CHATTERJEE
on 25 Feb 2019
Commented: Mohammed Bakr
on 25 Nov 2020
In GA toolbox in Matlab we are getting fitness curve in form of minimization. How can I get maximization (fitness function) curve?
Can anyone help me in getting GA code for optimization?
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Accepted Answer
Walter Roberson
on 25 Feb 2019
minimize the negative of the function.
[x, fvalp] = ga(@(x) -f(x), ....)
fval = -fvalp; %maximum value of the original function
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Walter Roberson
on 25 Nov 2020
You see in the Plot function section where you ask to plot best fitness? You would need to change that to a custom plot function that worked just like the plot function for best fitness but plotted the negative of the current value. See https://www.mathworks.com/help/gads/genetic-algorithm-options.html#f15210
There is no built-in way to maximize values using the solver-based approach: all you can do is minimize the negative of the function and understand that what you will get out is the location of the maxima, and that you need to take the negative of any function value you get out of your @(x)-mofun(x) function in order to know what the value would be in your original @mofun space.
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