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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, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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18 ## 02110-1301 USA. |
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19 |
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20 ## -*- texinfo -*- |
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21 ## @deftypefn {Function File} {[@var{zer}, @var{pol}, @var{k}] =} tf2zp (@var{num}, @var{den}) |
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22 ## Converts transfer functions to poles-and-zero representations. |
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23 ## |
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24 ## Returns the zeros and poles of the @acronym{SISO} system defined |
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25 ## by @var{num}/@var{den}. |
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26 ## @var{k} is a gain associated with the system zeros. |
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27 ## @end deftypefn |
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28 |
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29 ## Author: A. S. Hodel <a.s.hodel@eng.auburn.edu> |
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30 |
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31 function [zer, pol, k] = tf2zp (num, den) |
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32 |
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33 if (nargin == 2) |
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34 if (length (den) > 1) |
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35 pol = roots (den); |
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36 else |
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37 pol = []; |
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38 endif |
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39 |
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40 if (length (num) > 1) |
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41 zer = roots (num); |
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42 else |
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43 zer = []; |
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44 endif |
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45 else |
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46 print_usage (); |
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47 endif |
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48 |
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49 k = num(1) / den(1); |
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50 |
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51 endfunction |
