how to plot gaplotbestf with fitness function value ascending in matlab

main.m
% Step 1: Define the fitness function
fitnessFunc = @(x) yourFitnessFunction(x);

% Step 2: Set up options for the genetic algorithm
options = gaoptimset('PlotFcn', {@gaplotbestf, @yourCustomPlotFcn});

% Step 3: Create a custom PlotFcn
function yourCustomPlotFcn(options,state,flag)
    switch flag
        case 'init'
            hold on;
            xlabel('Generation');
            ylabel('Fitness function value');
            title('Best Fitness Function Value');
            
        case 'iter'
            [~, bestIdx] = min(state.Score);
            bestFitnessValue = state.Score(bestIdx);
            
            % Plot the best fitness function value in ascending order
            plot(state.Generation, sort(state.Score), 'r-');
            plot(state.Generation, bestFitnessValue, 'ro');
            hold off;
    end
end

% Step 4: Run the genetic algorithm
[x, fval] = ga(fitnessFunc, numVariables, [], [], [], [], lb, ub, [], options);
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