Error using DynamicSystem/lsim

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David Ling
David Ling 2017-11-29
评论： Star Strider 2023-5-11
0 down vote favorite I am running a dynamic system but I got an error saying:
Error using DynamicSystem/lsim (line 84)
When simulating the response to a specific input signal, the input data U must be a matrix of numeric values with at least two rows
(samples) and without any NaN or Inf.
Error while evaluating UIControl Callback
My code is
[vabls.ResponseYdata vabls.ResponseXdata] = lsim(vabls.ctf,vabls.numinput,vabls.tset);
My U and T are both same as 1x501 sym and 1x501 double. My sys is
814500
------------------------
s^2 + 361.2 s + 8.145e05
where numerator is [0,0,814500] and deniminator is [1,361.2000,8.1450e+05]

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Star Strider
Star Strider 2017-11-29
‘My U and T are both same as 1x501 sym and 1x501 double.’
They should both be double. Neither should be sym.
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youma
youma 2023-5-11
Hello @Star Strider I'm having a look alike error with my code.
function [cost, ceq] = drone_costfunction(x, systemea, yref, Q, R, t, u)
Q(1,1) = x(1);
Q(3,3) = x(2);
Q(5,5) = x(3);
R(1,1) = x(4);
R(2,2) = x(5);
K = lqr(systemea.A, systemea.B, Q, R);
sys_cl = ss(systemea.A - systemea.B*K, systemea.B, systemea.C, systemea.D);
y = lsim(sys_cl, u, t); %where the error occurs
ceq = [];
cost = sum((yref-y(:,1)).^2);
end
knowing that u and t, are taken with
[yref,y,u,t] =sys(A,B,C,D)
size(u)
ans =
94 1
size(t)
ans =
94 1
"Error using DynamicSystem/lsim
When simulating the response to a specific input signal, the input data U must be a matrix with as many rows as samples in the time
vector T, and as many columns as input channels.
I can't seem to understand what can possibly be wrong here. Thanks in advance for your help.
Star Strider
Star Strider 2023-5-11
I can’t determine what the problem is, however the ‘B’ matrix likely has more than one column (input channel).
To get a definitive response, post this as a new Question, and supply the function arguments, preferably as a .mat file. Without those, it can’t be run or simulated.
Stopping here.

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