fmincon returns wrong length

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K0ertis am 8 Okt. 2014

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https://de.mathworks.com/matlabcentral/answers/157794-fmincon-returns-wrong-length

Kommentiert: K0ertis am 8 Okt. 2014

Hi! I have a large Simulink- Modell in which I want to optimize two PI- controllers. My variables are x_1... x_4 such as:

 x = [Kp_1 Ti_1 Kp_2 Ti_2];
 [x,f,eflag,output] = fmincon(@fun,x0,[],[],[],[],lb,ub,@mynlconst,opts);

In my nonlinear constrains I added 20 constrains, for example:

 function [c,ceq] = mynlconst(x)
 ceq = [];
 set_param(char([SimName '/CF/Kp_1']), 'Gain', 'x(1)');
 set_param(char([SimName '/CF/Ti_1']), 'Gain', 'x(2)');
 % Same for x(3) and x(4)
 opts = simset('DstWorkspace','current','SrcWorkspace','base');
 sim(SimName,Tend,opts);
 c(1) = max(yout(:,1)) - MaxPX;
 c(2) = -min(yout(:,1)) - MinPX;
 c(3) = max(yout(:,3)) - MaxTX;
 c(4) = -min(yout(:,3)) - MinTX;
 c(5) = max(yout(:,5)) - MaxHX;
 c(6) = -min(yout(:,5)) - MinHX;
      |
 c(20)= ...;

yout is a matrix from Simulink with the size (130,variables). As constrains I've used the max, min of the vector.

My optimazion function fun (To keep it simple I just wrote the necessary parts):

 function y = fun(x)
 set_param(char([SimName '/CF/Kp_1']), 'Gain', 'x(1)');
 set_param(char([SimName '/CF/Ti_1']), 'Gain', 'x(2)');
 % Same for x(3) and x(4)
 opts = simset('DstWorkspace','current','SrcWorkspace','base');
 sim(SimName,Tend,opts);
 y = e'*e; % e= error, imput of controller