Transfer function response using idinput as input signal.
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Rohan Gulur
on 28 Jul 2023
Commented: Star Strider
on 28 Jul 2023
Hello, I currently have a binary(0, 1 alternating) input signal which I created using the idinput signal object. In addition, I also have a discretized transfer function which I have created.
Here is an example of my input signal function: u = idinput(100,'prbs',Band,Range);
My discretized transfer function is a normal discrete transfer function.
I want to plot the time domain response of this idinput signal with a system response using the discretized transfer function. I tried to use the lsim command with the following arguments(transferFunction, u, time).
I am getting an error when plotting the output however, stating that: Incorrect number or types of inputs or outputs for function 'iosize'.
Does anybody know how to properly plot the discretized transfer function response with an idinput signal object.
Regards.
1 Comment
Jon
on 28 Jul 2023
Please provide a simple, standalone, runnable example that reproduces the problem, or at least copy your code, and the full error message. To include code, please use the insert code tool on the MATLAB answers toolbar.
Accepted Answer
Star Strider
on 28 Jul 2023
It would help to have the details.
Example —
num = rand(1,2)
den = rand(1,3)
Ts = 0.01;
sys = tf(num,den,Ts)
Range = [-2,2];
Band = [0 1/4];
u = idinput(100, 'prbs', Band, Range);
[y,t] = lsim(sys, u);
figure
plot(t, y, 'DisplayName','Output')
hold on
plot(t, u, 'DisplayName','Input')
hold off
grid
legend('Location','best')
This works.
.
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