to plot fitness function changes at each generation and change the y-axes value of the fitness in matlab

To plot the fitness function changes at each generation in MATLAB, you can follow the steps below:

1. First, make sure you have a vector or array that contains the fitness values for each generation. Let's assume you have a variable called fitness that stores these values.

2. You can create a plot using the plot function in MATLAB. Use the index values of the fitness vector as the x-axis and the fitness values as the y-axis.

main.m
generation = 1:length(fitness);
plot(generation, fitness);
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3. By default, MATLAB will automatically adjust the y-axis limits based on the range of fitness values. If you want to manually set the y-axis limits, you can use the ylim function. For example, if you want the y-axis to range from 0 to 100, use:

main.m
ylim([0, 100]);
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4. You can further customize your plot by adding axis labels, a title, or a legend. Here's an example:

main.m
xlabel('Generation');
ylabel('Fitness');
title('Fitness Function Changes');
legend('Fitness');
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Putting it all together, here's the complete code:

main.m
generation = 1:length(fitness); % Assuming you have a variable 'fitness' that contains the fitness values
plot(generation, fitness);
ylim([0, 100]); % Set the desired y-axis limits
xlabel('Generation');
ylabel('Fitness');
title('Fitness Function Changes');
legend('Fitness');
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Remember to replace fitness with your actual variable name that contains the fitness values.

I hope this helps!