Thread Subject: parametric state space representation.

Hi,

I am doing my best to define a state space representation which contains a parameter,say p, but as you know "sys=ss(A,B,C,D)" only accepts numerical value.
I decided to approach instead of that try to make it by tihs formula "sys=C(inv(SI-A))B".

but when I go to calculate the obtained transfer function at a certain value of p and then compare it with the one comes from "ss" command, I get two different transfer function!!!!!!!!!

Do you know why?could you introduce me a better approach or another command for parametric state space computation?

Hope to hearing from you soon.

Best,
Mohammad