I understand that you would like to apply “Ant Colony Optimization” but are facing the error "Unrecognized function or variable 'RouletteWheelSelection'. This is because the function "RouletteWheelSelection" is not defined in your MATLAB path.
The Roulette Wheel Selection is a method used in genetic algorithms for selecting potentially useful solutions for recombination. Here's a simple implementation of the Roulette Wheel Selection:
function j = RouletteWheelSelection(P)
r = rand;
C = cumsum(P);
i = find(r <= C, 1, 'first');
if isempty(i)
j = length(P);
else
j = i;
end
end
You can add this function to your code, and it should resolve the error. Make sure to add it outside your main function, at the end of your script.
Also, your code seems to be incomplete. The function "fitnessFunction" is not defined, and the function "PlotSolution" is also missing. You need to define these functions or replace them with appropriate MATLAB functions.
An example of the aforementioned functions is attached below. Note that these functions should be changed according to the need.
function fit = fitnessFunction(x)
fit = strength(x); % Edit the fitnessFunction according to need
end
function PlotSolution(Bestfitness)
plot(Bestfitness, 'LineWidth', 2); % Edit the PlotSolution function according to need
xlabel('Iteration');
ylabel('Best Fitness');
grid on;
end
You would call this function after your main optimization loop, like this:
% After your main ACO loop:
PlotSolution(Bestfitness);
Please refer to the following documentation for more information on the functions used in "Roulette Wheel Selection":
- https://www.mathworks.com/help/matlab/ref/cumsum.html
- https://www.mathworks.com/help/matlab/ref/find.html
Hope this helps in resolving your issue!
