|
3279
|
1 # Copyright (C) 1996,1998 Auburn University. All Rights Reserved |
|
3213
|
2 # |
|
|
3 # This file is part of Octave. |
|
|
4 # |
|
|
5 # Octave is free software; you can redistribute it and/or modify it |
|
|
6 # under the terms of the GNU General Public License as published by the |
|
|
7 # Free Software Foundation; either version 2, or (at your option) any |
|
|
8 # later version. |
|
|
9 # |
|
|
10 # Octave is distributed in the hope that it will be useful, but WITHOUT |
|
|
11 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
|
|
12 # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
|
|
13 # for more details. |
|
|
14 # |
|
|
15 # You should have received a copy of the GNU General Public License |
|
|
16 # along with Octave; see the file COPYING. If not, write to the Free |
|
3284
|
17 # Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. |
|
3213
|
18 |
|
|
19 function [zer,pol,k] = tf2zp(num,den) |
|
|
20 # Converts transfer functions to poles / zeros. |
|
|
21 # |
|
|
22 # [zer,pol,k] = tf2zp(num,den) returns the zeros and poles of the SISO system |
|
|
23 # defined by num/den. K is a gain associated with the system zeros. |
|
|
24 |
|
|
25 # Written by A. S. Hodel, etc. |
|
|
26 |
|
|
27 if(nargin == 2) |
|
|
28 if(length(den) > 1) pol = roots(den); |
|
|
29 else pol=[]; endif |
|
|
30 if(length(num) > 1) zer = roots(num); |
|
|
31 else zer=[]; endif |
|
|
32 else error("Incorrect number of input arguments"); |
|
|
33 endif |
|
|
34 |
|
|
35 [a,b,c,d] = tf2ss(num,den); |
|
|
36 [dum,k] = tzero(a,b,c,d); |
|
|
37 endfunction |
