How to order 'n' no of populations in ascending order based on their fitness for a minimization objective in matlab

How to order 'n' no of populations in ascending order based on their fitness for a minimization objective in matlab?

[dhiman banerjee]

Thank you for the reply. But this code gives fitness value of te each population in acending order. My problem is - that to reorder each population (i.e rows of the population matrix) as per the fitness value of each population in ascending order (Minimization objective)

Kindly help me in this point.

[Syed Ahmed]

Try this i had the same issue as you.

fitnessVector = [106; 100; 120; 104]; % fitness value
popu = [12 11 67 89 56;               % populationn vector
        45 13 77 39 86;
        92 54 67 79 76;
        62 54 65  9 5];
        
[X,I] = sort(fitnessVector); % to get indexes of order
popu = [I,popu];             % add index order as first column 
popu = sortrows(popu,'descend'); % sorts based on the first column of matrix
fitnessVector = X            % fitness values 

fitnessVector = 4×1

100 104 106 120

popu(:,1) = [];                  % remove first column from population.

Answer 1

[thoughtGarden]

I'm assuming you already have the fitness of each population according to the minimization objective. If this is the case, you will simply obtain the index order from the "sort" function while using the "direction" parameter.

sortedIndex = sort(fitnessVector, [],'ascend');

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