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system minimize questions


From: Kai Shing Lee
Subject: system minimize questions
Date: Thu, 19 May 2005 16:36:23 +0800 (CST)

How to minimize the system when I have same pole and
zero ?

In the following example, I have the same term "(s+1)"
in the num and den of system,x. How can I remove them
so that x=1/(s+1) ?


octave:54> x=tf( [1 1], [ 1 2 1]);
octave:55> sysout(x,"zp");
Input(s)
      1: u_1

Output(s):
     1: y_1

zero-pole form:
1 (s + 1)
-----------------
  (s + 1) (s + 1)


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