showing "too many output arguments" error in this code

Question

KEERTHANA P B 2022-1-25

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1635485-showing-too-many-output-arguments-error-in-this-code

回答： ag 2023-11-3

function [J] = pid_optim(x)
s = tf('s');
plant = 1 / (s^2 + 10*s + 20);
Kp = x(1);
Ki = x(2);
Kd = x(3);
cont = Kp + Ki/s + Kd * s;
step(feedback(plant*cont,1));
dt = 0.01;
t = 0:dt:1;
e = 1 - step(feedback(plant*cont,1),t);
J = sum(t'.*abs(e)*dt);

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Answer 1

ag 2023-11-3

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https://ww2.mathworks.cn/matlabcentral/answers/1635485-showing-too-many-output-arguments-error-in-this-code#answer_1346051

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Hi Keerthana,

I understand that you are getting “too many output arguments” error while implementing genetic algorithm.

I tried to run the function provided by you, and it ran without any errors. Try to modify the caller function to rectify the error.

Below is the full working code:

s  = tf('s'); 
Gp = 1 / (s^2 + 10*s + 20); 
step(Gp, 2), grid on 
nvars     = 3; 
K = ga(@pid_optim, nvars) 
Gc = K(1) + K(2)/s + K(3)*s;  % ideal type 
Gcl = feedback(Gc*Gp, 1); 
step(Gcl, 2), grid on 
S = stepinfo(Gcl) 
function [J] = pid_optim(x) 
    s = tf('s'); 
    plant = 1 / (s^2 + 10*s + 20); 
    Kp = x(1); 
    Ki = x(2); 
    Kd = x(3); 
    cont = Kp + Ki/s + Kd * s; 
    %step(feedback(plant*cont,1)); 
    dt = 0.01; 
    t = 0:dt:1; 
    e = 1 - step(feedback(plant*cont,1),t); 
    J = sum(t'.*abs(e)*dt); 
end 