Writing fitness function in multi objective GA

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Hari
Hari 2022-5-25
回答： M Mirrashid 2022-6-5
If I need to go for a multi objective optimisation in GA, how can I bring in the two objectives in a custom made fitness function. Can someone explain in the context of the travelling salesman problem described here : https://in.mathworks.com/help/gads/custom-data-type-optimization-using-ga.html

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Walter Roberson
Walter Roberson 2022-5-25
mobj = @(x) [fun1(x); fun2(x) ]
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Walter Roberson
Walter Roberson 2022-5-27
Ran in:
I am not getting a problem in my tests ?
fun1 = @(x) sin(pi*x(:,1)) + sinh(x(:,2));
fun2 = @(x) cos(pi*x(:,1)) + cosh(x(:,2));
mobj = @(x) [ fun1(x), fun2(x) ];
nvars = 2;
lb = [-pi -pi];
ub = [pi pi];
options1 = optimoptions(@gamultiobj, 'UseVectorized', false);
[Y1, fval1] = gamultiobj(mobj, nvars, [], [], [], [], lb, ub, [], options1);
Optimization terminated: average change in the spread of Pareto solutions less than options.FunctionTolerance.
options2 = optimoptions(@gamultiobj, 'UseVectorized', true);
[Y2, fval2] = gamultiobj(mobj, nvars, [], [], [], [], lb, ub, [], options1);
Optimization terminated: average change in the spread of Pareto solutions less than options.FunctionTolerance.
Hari
Hari 2022-6-4
Yes, I tried again. The second approach worked this time. Thanks!!

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M Mirrashid
M Mirrashid 2022-6-5

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