using gamultiobj with 24 variables

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Thushara De Silva 2018-9-23

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评论： Thushara De Silva 2018-9-28

My fitness function (fit_KotPol) calculate two values for 24 variables. I want to define the inti

fitnessfcn = @fit_KotPol;
nvars = 24;
lb=[22.2 22.2 22.2 22.2 22.2 22.2 22.2 22.2 22.2 22.2 22.2 22.2  0 0 0 0 0 0 0 0 0 0 0 0];
ub=[172.9 172.9 172.9 172.9 172.9 172.9 172.9 172.9 172.9 172.9 172.9 172.9 140 140 140 140 140 140 140 140 140 140 140 140];
A = [ ]; b = [ ]; Aeq = [ ]; beq = [ ]; 
startTime = tic;
options = optimoptions('gamultiobj','UseParallel',true,'PlotFcn',{@gaplotpareto,@gaplotscorediversity});
[x,fval,exitflag,output] = gamultiobj(fitnessfcn,nvars,lb,ub,options);
stopTime = toc(startTime);

I got the error

Error using gamultiobj (line 281)
GAMULTIOBJ requires the following inputs to be of data type double: 'Aeq'.

Help me to use the gamultiobj

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回答（2 个）

Stephan 2018-9-23

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https://ww2.mathworks.cn/matlabcentral/answers/420366-using-gamultiobj-with-24-variables#answer_337989

编辑：Stephan 2018-9-23

在 MATLAB Online 中打开

Hi,

the input syntax for gamultiobj has no option for passing lb and ub to gamultiobj without also passing A,b Aeq, beq. You defined them all, but you dont use them in your function call.

Use:

[x,fval,exitflag,output] = gamultiobj(fitnessfcn,nvars,A,b,Aeq,beq,lb,ub,options);

Best regards

Stephan

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Thushara De Silva 2018-9-27

编辑：Walter Roberson 2018-9-28

在 MATLAB Online 中打开

function [A, B] = fit_KotPol( x )
...several calculations
A=
B=
end

The above function (fit_KotPol(x)) is for calculating the A and B, which are the values for two objectives for each set x values.

fitnessfcn = @fit_KotPol;
nvars = 24;
lb=[22.2 22.2 22.2 22.2 22.2 22.2 22.2 22.2 22.2 22.2 22.2 22.2  0 0 0 0 0 0 0 0 0 0 0 0];
ub=[172.9 172.9 172.9 172.9 172.9 172.9 172.9 172.9 172.9 172.9 172.9 172.9 140 140 140 140 140 140 140 140 140 140 140 140];
A = [ ]; b = [ ]; 
Aeq = [ ]; beq = [ ]; 
startTime = tic;
options = optimoptions('gamultiobj','UseParallel',true,'PlotFcn',{@gaplotpareto,@gaplotscorediversity});
[x,fval,exitflag,output] = gamultiobj(fitnessfcn,nvars,A,b,Aeq,beq,lb,ub,options);
stopTime = toc(startTime);
fprintf('The number of points on the Pareto front was: %d\n', size(x,1));
fprintf('The average distance measure of the solutions on the Pareto front was: %g\n', Output.averagedistance);
fprintf('The spread measure of the Pareto front was: %g\n', Output.spread);
fprintf('The number of generations was : %d\n', Output.generations);

Walter Roberson 2018-9-28

The number of pareto points returned by gamultiobj is not known in advance.

x will be m by nvars, so something by 24 in your case, where m is however many pareto points the function detected during the limits it was given on execution.

Thushara De Silva 2018-9-28

Thank you Walter Roberson and Stephan Jung for the reply. Those are really helpful.

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Thushara De Silva 2018-9-27

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/420366-using-gamultiobj-with-24-variables#answer_338794

编辑：Walter Roberson 2018-9-28

Further to the above question how can I initialize the population? I want to give initial values for 24 variables as below.

InitialPopulationMatrix_Data = [93.2 66.6 40 59 78 97 116 135 154 172.9 146.3 119 39 76 104 120 107 58 80 80 53 61 60 36]

However, the population size is 200 as default. How do I do it?

Please help.

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Walter Roberson 2018-9-28

When you supply a population matrix in the options, if the number of rows you provide is less than the population size, then it will initialize the remaining rows randomly.

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