Hello Yi!
The error you are seeing occurs when MATLAB's parallel workers are unable to access the fitness function file. This typically happens during the parallel execution of the Genetic Algorithm. To fix this, you can use MATLAB’s built-in “addAttachedFiles” function to explicitly send the function file to all parallel workers.
The key fix to apply is:
addAttachedFiles(gcp, {'FCWithDisc.m'});
Below is a modified version of your code with the fix:
% Start parallel pool (if not already running)
if isempty(gcp('nocreate'))
parpool;
end
% Attach the fitness function file to all workers
addAttachedFiles(gcp, {'FCWithDisc.m'});
% GA configuration
opts = optimoptions(@ga, ...
'PopulationSize', 10, ...
'MaxGenerations', 50, ...
'EliteCount', 1, ...
'FunctionTolerance', 1e-5, ...
'PlotFcn', @gaplotbestf, ...
'UseParallel', true);
% Example constraint and bound setup
A = []; b = [];
lb = -5 * ones(1,6);
ub = 5 * ones(1,6);
% Run the GA
[xbestDisc, fbestDisc, exitflag, output, population, scores] = ...
ga(@FCWithDisc, 6, A, b, [], [], lb, ub, [], 1:6, opts);
This fix ensures that all workers running in parallel have access to the function file “FCWithDisc.m”. Please make sure that the fitness function ‘FCWithDisc.m’ is located in the current folder (or is on the MATLAB path), and that the filename matches exactly, including capitalization.
This should resolve the encountered error and allow GA to run using parallel computing.
You can refer to the following documentation links for more details:
