From help-octave-request at bevo dot che dot wisc dot edu Fri Jan 25 02:06:40 2002
Subject: rlocus
From: "John W. Eaton" <jwe at bevo dot che dot wisc dot edu>
To: torsten at inetw dot net
Cc: help-octave at bevo dot che dot wisc dot edu
Date: Fri, 25 Jan 2002 02:05:55 -0600

On 25-Jan-2002, Torsten Howard <torsten at inetw dot net> wrote:

| I went and tried to do a simple rlocus this evening, but it wasn't simple.
| 
| I'll put a transcipt at the end of the page, how do I make this work?
| 
| octave:1> num = [1];
| octave:2> den = [1 6 11 6];
| octave:3> rlocus(num,den)
| error: Asys must be a system data structure (see ss2sys, tf2sys, zp2sys)

If you expect your num and den to describe a transfer function of the
form

	       1
    --------------------------
    1*s^3 + 6*s^2 + 11*s^1 + 6

try

  rlocus (tf2sys (num, den))


jwe



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