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1 ## Copyright (C) 1996, 1998 Auburn University. All rights reserved. |
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2 ## |
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3 ## This file is part of Octave. |
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4 ## |
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5 ## Octave is free software; you can redistribute it and/or modify it |
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6 ## under the terms of the GNU General Public License as published by the |
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7 ## Free Software Foundation; either version 2, or (at your option) any |
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8 ## later version. |
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9 ## |
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10 ## Octave is distributed in the hope that it will be useful, but WITHOUT |
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11 ## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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12 ## FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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13 ## for more details. |
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14 ## |
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15 ## You should have received a copy of the GNU General Public License |
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16 ## along with Octave; see the file COPYING. If not, write to the Free |
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17 ## Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. |
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18 |
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19 ## -*- texinfo -*- |
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20 ## @deftypefn {Function File} {@var{outputs} =} tf2zp (@var{inputs}) |
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21 ## Converts transfer functions to poles / zeros. |
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22 ## |
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23 ## [zer,pol,k] = tf2zp(num,den) returns the zeros and poles of the SISO system |
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24 ## defined by num/den. K is a gain associated with the system zeros. |
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25 ## @end deftypefn |
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26 |
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27 ## Author: A. S. Hodel <a.s.hodel@eng.auburn.edu> |
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28 |
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29 function [zer, pol, k] = tf2zp (num, den) |
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30 |
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31 if(nargin == 2) |
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32 if(length(den) > 1) pol = roots(den); |
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33 else pol=[]; endif |
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34 if(length(num) > 1) zer = roots(num); |
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35 else zer=[]; endif |
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36 else error("Incorrect number of input arguments"); |
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37 endif |
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38 |
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39 [a,b,c,d] = tf2ss(num,den); |
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40 [dum,k] = tzero(a,b,c,d); |
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41 |
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42 endfunction |
