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1 ## Copyright (C) 1996, 2000, 2002, 2004, 2005, 2006, 2007 |
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2 ## Auburn University. All rights reserved. |
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3 ## |
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4 ## This file is part of Octave. |
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5 ## |
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6 ## Octave is free software; you can redistribute it and/or modify it |
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7 ## under the terms of the GNU General Public License as published by |
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8 ## the Free Software Foundation; either version 3 of the License, or (at |
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9 ## your option) any later version. |
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10 ## |
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11 ## Octave is distributed in the hope that it will be useful, but |
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12 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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14 ## General Public License for more details. |
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15 ## |
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16 ## You should have received a copy of the GNU General Public License |
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17 ## along with Octave; see the file COPYING. If not, see |
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18 ## <http://www.gnu.org/licenses/>. |
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19 |
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20 ## -*- texinfo -*- |
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21 ## @deftypefn {Function File} {[@var{num}, @var{den}, @var{tsam}, @var{inname}, @var{outname}] =} sys2tf (@var{sys}) |
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22 ## Extract transfer function data from a system data structure. |
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23 ## |
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24 ## See @command{tf} for parameter descriptions. |
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25 ## |
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26 ## @strong{Example} |
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27 ## @example |
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28 ## octave:1> sys=ss([1 -2; -1.1,-2.1],[0;1],[1 1]); |
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29 ## octave:2> [num,den] = sys2tf(sys) |
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30 ## num = 1.0000 -3.0000 |
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31 ## den = 1.0000 1.1000 -4.3000 |
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32 ## @end example |
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33 ## @end deftypefn |
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34 |
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35 ## Author: R. Bruce Tenison <btenison@eng.auburn.edu> |
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36 ## Created: June 24, 1994 |
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37 ## modified to make sys2tf by A. S. Hodel Aug 1995 |
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38 ## modified again for updated system format by John Ingram July 1996 |
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39 |
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40 function [num, den, tsam, inname, outname] = sys2tf (Asys) |
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41 |
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42 if (nargin != 1) |
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43 print_usage (); |
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44 endif |
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45 |
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46 if (! isstruct (Asys)) |
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47 error ("Asys must be a system data structure (see ss, tf, zp)"); |
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48 elseif (! is_siso (Asys)) |
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49 [n, nz, m, p] = sysdimensions (Asys); |
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50 error ("system is not SISO: %d inputs, %d outputs", m, p); |
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51 endif |
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52 |
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53 Asys = sysupdate (Asys, "tf"); # just in case |
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54 |
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55 num = Asys.num; |
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56 den = Asys.den; |
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57 |
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58 tsam = sysgettsam (Asys); |
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59 inname = sysgetsignals (Asys, "in"); |
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60 outname = sysgetsignals (Asys, "out"); |
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61 |
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62 endfunction |
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63 |
