|
3381
|
1 ## Copyright (C) 1996,1998 Auburn University. All Rights Reserved |
|
|
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 |
|
|
17 ## Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. |
|
3213
|
18 |
|
3346
|
19 ## -*- texinfo -*- |
|
|
20 ## @deftypefn {Function File } { outputs =} tf2zp ( inputs ) |
|
|
21 ## @format |
|
|
22 ## Converts transfer functions to poles / zeros. |
|
|
23 ## |
|
|
24 ## [zer,pol,k] = tf2zp(num,den) returns the zeros and poles of the SISO system |
|
|
25 ## defined by num/den. K is a gain associated with the system zeros. |
|
|
26 ## |
|
|
27 ## |
|
|
28 ## @end format |
|
|
29 ## @end deftypefn |
|
|
30 |
|
3213
|
31 function [zer,pol,k] = tf2zp(num,den) |
|
3381
|
32 ## Written by A. S. Hodel, etc. |
|
3213
|
33 |
|
|
34 if(nargin == 2) |
|
|
35 if(length(den) > 1) pol = roots(den); |
|
|
36 else pol=[]; endif |
|
|
37 if(length(num) > 1) zer = roots(num); |
|
|
38 else zer=[]; endif |
|
|
39 else error("Incorrect number of input arguments"); |
|
|
40 endif |
|
|
41 |
|
|
42 [a,b,c,d] = tf2ss(num,den); |
|
|
43 [dum,k] = tzero(a,b,c,d); |
|
|
44 endfunction |
