Add parameters in transfer function

Hello, I need a transfer function like this: 1/(k_s*s^2+1)

But I get an error message and then I can't solve the feedback. How can I do it?

Thank you in advance.

[Ameer Hamza]

In MATLAB, the transfer function cannot have variable coefficients. Can you explain what are you trying to do?

Answer 1

[Star Strider]

The ‘H’ transfer function and the feedback output function can be anonymous functions:

G = tf(1, [2 0 1])
H = @(k_s) tf(1, [k_s 0 1])

GH = @(k_s) feedback(G,H(k_s))

ks = 0.25;
step(GH(ks))

That runs without error in R2020a.