How can I change the output of the code to scalar?

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Peter Mwangi
Peter Mwangi 2018-2-12
回答： Peter Mwangi 2018-2-15
I am trying to find the optimal values of a function @poweroptone but the GA tool doesn't complete the optimization because of the vector error. To be precise, this is the error that pops up `Error running optimization. Your fitness function must return a scalar value.` Here is the code:
function Pmax = poweroptone(Lt, R)
Lt =(0.01:0.0005:0.07);
R=(4:0.025:7);
Pmax =((1222.714521).*sqrt(Lt).*sqrt(0.03 + Lt./2).*sqrt(R./(R - 1)).*((sqrt(0.27) - 1.054.*sqrt(0.03 + Lt))./(sqrt(0.27).*(sqrt(0.03 - Lt)))));
end
The number of variables are two (2). How can I change the output of the code to scalar?
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Peter Mwangi
Peter Mwangi 2018-2-12
I am trying to find the minimum value of Pmax for specific one value pf Lt and R

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Peter Mwangi
Peter Mwangi 2018-2-15
Thank you for the feedback. I found the solution to the question. I first created the objective function
function P = power_one(x)
P=(1222.714521).*(sqrt(x(1))*sqrt(0.03 + (x(1))/2)*sqrt ((x(2))/((x(2) - 1)))*((sqrt(0.27) - 1.054 * sqrt(0.03 + x(1)))/(sqrt(0.27)*sqrt(0.03 + x(1)))));
end
And then I called it in the main function as follows;
Lb=[0.01 4];
Ub=[0.07 7];
fitn =@(x)power_one(x);
[x, fval]=ga(fitn,2, [], [], [], [], Lb, Ub);
I hope this will help someone in future. Thank you for the input.

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