Error using DynamicSystem/lsim

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Anthony Sirico
Anthony Sirico on 12 Feb 2021
Answered: Shubham Khatri on 21 Feb 2021
clear; clc; close all;
A = [1 0 0 0; 0 -1 0 0; 0 0 -2 0; 0 0 0 -3];
B = [1 0; -1 1; 0 -1; 1 -1];
C = eye(4);
D = 0;
X0 = [-2; -1; 1; 2];
EvA = eig(A);
sys = ss(A,B,C,D);
AT = transpose(A)
BT = transpose(B)
t = 0:1:3;
t0 = 0;
tfinal = 3;
Wc = integral(@(t) integrand(t,t0,A,B),t0,tfinal,'ArrayValued',true);
IW = inv(Wc)
phi = exp(AT.*(-t));
u = -BT*phi*IW*X0;
lsim(sys, u, t, X0)
grid on
Error using DynamicSystem/lsim (line 97)
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 in HW3_1 (line 19)
lsim(sys, u, t, X0)
Any thoughts

Answers (1)

Shubham Khatri
Shubham Khatri on 21 Feb 2021
Hello,
This error occurs when the number of rows in 'u' is not equal to number of rows in 't'. Please refer to the documentation link of the integral , lsim for more information.
Hope it helps

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