# using gamultiobj with 24 variables

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Thushara De Silva il 23 Set 2018
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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### Risposte (2)

Stephan il 23 Set 2018
Modificato: Stephan il 23 Set 2018
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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Walter Roberson il 28 Set 2018
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 il 28 Set 2018
Thank you Walter Roberson and Stephan Jung for the reply. Those are really helpful.

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Thushara De Silva il 27 Set 2018
Modificato: Walter Roberson il 28 Set 2018
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 il 28 Set 2018
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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