include a parameter inside a transfer function?

Hello all

I want to enter the following transfer function (as a function of s)

(s+2)/(s+b), where b is a parameter.

I tried with

syms b
sys=tf([1 2], [1 b])

But it gave me a error. How can I do this?

Answer 1

[Walter Roberson]

http://nptel.ac.in/courses/Webcourse-contents/IIT-Delhi/Control%20system%20design%20n%20principles/module2/module2-2_middle.htm