how can i formulate this fitness function ?

hello everybody...

my problem is : i have matrix consist of 4 columns and 200 rows , the fist column represent the index , the second column contain the values of weights ( in kg) , third column contain the values of length(in meter) , the fourth column contains the values of age(in days) . how i can formulate this problem in genetic algorithm (e.g NSGA-II)in matlab , such that finally i want the number vector or pareto-front that contain (low value of weight, high value of length, less value of age ) simultaneously. for example:

1 : 20 70 45

2: 49 10 67

3: 100 15 46

4: .... and so on .

And what is form of the fitness function? Please help me...

With sincere thanks and appreciation.....

Answer 1

[Star Strider]

The function you want is gamultiobj (link).

I am not certain what you want to do, so I leave the design of the fitness function to you.

Something like this could work:

M = [(1:25)' randi(100, 25, 3)];                                            % Create Data Matrix
fitfcn = @(x) [x(1).*min(M(2)), x(2).*max(M(3)), x(3).*min(M(4))];
X = gamultiobj(fitfcn, 3)
Mval = [X(:,1).*min(M(:,2)), X(:,2).*max(M(:,3)), X(:,3).*min(M(:,4))];

figure(1)
scatter3(Mval(:,1), Mval(:,2), Mval(:,3), 'p')
grid on

figure(2)
stem3(Mval(:,1), Mval(:,2), Mval(:,3), 'p', 'Filled')
grid on

[Ameer Kadhim]

Thank you so much .. I have sent the problem in detail to you on email.

[Star Strider]

As always, my pleasure.

I read the problem as you described it in your email. Communications networks are far outside my areas of expertise, and require a more extensive background than I have. I suggest that you begin a new thread, describing your problem in detail.

The gammultiobj function is certainly appropriate for it. However I have no idea how to formulate a problem that involves communications networks.

[Ameer Kadhim]

please help me...

[Star Strider]

I wish I could. I have no idea how to formulate a problem to optimise communication networks.

The problem that you originally described is not in any way related to the actual problem you want to solve.

[Ameer Kadhim]

Do you know someone who can help me please. I'm tired. I did not find the solution ..

[Star Strider]

There are probably people here on MATLAB Answers who have the expertise you need. That is the reason I suggested that you ask a new Question, this time describing the problem you actually want to solve.