Changing a parameter in a trasferire function

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Gaetano Ruocco
Gaetano Ruocco 2023-2-27
评论： Paul 2023-2-27
I have the following transfer function
h = 1 for t<=0 and 0 for t>0
I have to determine the properties of the LTI system for t<=0 and t>0.
How can I make h change its value automatically ? Without doing two cases for h=1 and h=0
Thank you for your help
  1 个评论
Paul
Paul 2023-2-27
Hi Gaetano,
Assuming t is the independent variable of the the inverse transform of G(s), i.e., g(t) -> G(s), the coefficients in G(s) can't change as a function of time. LTI systems have constant coefficients. Can you clarify what t is how it enters into the problem?

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Star Strider
Star Strider 2023-2-27
Ran in:
I demonstrated this in your earlier post: How to change a parameter in a model.
The same approach applies here —
s = tf('s');
G = @(h) s^2 / ((s+h)*(s+1));
t = [linspace(0, 10, 250); linspace(-10, 0, 250)];
figure
for k = 1:2
subplot(2,1,k)
step(G(k-1),t(k,:))
grid
title(sprintf('h = %d',k-1))
end
The function is not defined for t<0.
.

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