GA optimisation how to find maxima instad of minima.

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BioZ
BioZ 2021-11-18
评论： Jan 2021-11-18
Greetings, I have the following code;
I use "ga" of Global Optimisation Toolbox and it works.
My only problem here is that the ga is trying to find the minima where as I want to find the maxima. How can I set the ga optimisation to find the maxima of y(1) ?
(The only way I found is to put a minus in the y(1) equation.)
SquareF.m
function y = SquareF(x)
%y(1) = (x+2)^2 - 10;
Lt = 10; %Total Length
A = Lt*x; % Side A
B = Lt-A; % Side B
y(1) = A*B;
rL = A+B;
end
Optim.m
clc; clear all; close all
FitnessFunction = @SquareF;
numberOfVariables = 1;
A = []; b = [];
Aeq = []; beq = [];
lb = 0;
ub = 1;
options = optimoptions(@ga,'PlotFcn',{@gaplotpareto,@gaplotscorediversity});
[x,Volume] = ga(FitnessFunction,numberOfVariables,A,b,Aeq,beq,lb,ub)

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采纳的回答

Jan
Jan 2021-11-18
(The only way I found is to put a minus in the y(1) equation.)
This is the perfect solution already.
  2 个评论
BioZ
BioZ 2021-11-18
Ok, I thought perhaps there was an option that would dictate ga function to find minama or maxima.
Jan
Jan 2021-11-18
All optimizers are minimizers. This is a convention without a deeper meaning. Changing the sign of the cost function is a cheap solution - equivalent to cups for left-handers.

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