Gamultiobj only finding one point on pareto front
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I am implementing gamultiobj to solve three cost functions. When the program runs it only finds one point on the pareto front when I am sure there should be multiple solutions.
Are there any solver settings I can modify to find multiple solutions on the pareto front?
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Ahmed Ellithy
le 19 Jan 2022
Hello Hannah,
I have the same question, and I would like to know if you have any updates?
My Pareto front has multiple points on top of each other, and I am sure this is not the global minima, so the algorithm is stuck on this local minima and cannot generate a Pareto front with the normal shape of distributed points.
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Alan Weiss
le 4 Août 2021
I suggest that you find the single-objective minima as in Start from Single-Objective Solutions or Start from Single-Objective Solutions. These are two different examples that show the value of starting from the single-objective solutions to obtain a wider Pareto set.
You can also try the paretosearch solver, which sometimes finds a wider Pareto set on badly-scaled problems, as in this example.
If, by some chance, you still end up with a single point, then it is possible that there is only one feasible Pareto point.
Alan Weiss
MATLAB mathematical toolbox documentation
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Alan Weiss
le 4 Août 2021
Modifié(e) : Alan Weiss
le 4 Août 2021
If the single-objective problems all have the same solution then that is your answer. There is nothing else. There is no tradeoff curve (Pareto front) because all the objectives are minimized at the same point.
The only other possibility that I can see is to try starting the single-objective solvers from different start points. Maybe there are multiple local minima.
Alan Weiss
MATLAB mathematical toolbox documentation
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