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

3 次查看（过去 30 天）

Peter Mwangi 2018-2-12

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/382181-how-can-i-change-the-output-of-the-code-to-scalar

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?

4 个评论
显示 2更早的评论隐藏 2更早的评论

Peter Mwangi 2018-2-12

Thank you. Then what should I do to fix the problem?

Peter Mwangi 2018-2-12

I am trying to find the minimum value of Pmax for specific one value pf Lt and R

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Peter Mwangi 2018-2-15

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/382181-how-can-i-change-the-output-of-the-code-to-scalar#answer_305380

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.