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1 # Copyright (C) 1996 A. Scottedward Hodel |
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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, 675 Mass Ave, Cambridge, MA 02139, USA. |
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18 |
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19 function [num,den,tsam,inname,outname] = sys2tf(Asys) |
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20 # function [num,den,tsam,inname,outname] = sys2tf(Asys) |
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21 # Conversion from a system data structure format to a transfer function. The |
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22 # transfer function part of ASYS is returned to the user in the form: |
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23 # |
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24 # num(s) |
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25 # G(s)=------- |
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26 # den(s) |
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27 # |
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28 # The user can also have the sampling time (TSAM), the name of the input |
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29 # (INNAME), and the output name (OUTNAME) |
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30 |
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31 # Written by R. Bruce Tenison (June 24, 1994) btenison@eng.auburn.edu |
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32 # modified to make sys2tf by A. S. Hodel Aug 1995 |
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33 # modified again for updated system format by John Ingram July 1996 |
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34 # $Revision: 2.0.0.0 $ |
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35 |
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36 if(nargin != 1) |
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37 usage("[num,den,tsam,inname,outname] = sys2tf(Asys)"); |
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38 endif |
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39 |
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40 if( !is_struct(Asys)) |
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41 error("Asys must be a system data structure (see ss2sys, tf2sys, zp2sys)"); |
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42 elseif (! is_siso(Asys) ) |
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43 [n, nz, m, p] = sysdimensions(Asys); |
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44 error(["system is not SISO (",num2str(m)," inputs, ... |
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45 ", num2str(p)," outputs"]); |
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46 endif |
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47 |
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48 Asys = sysupdate(Asys,"tf"); # just in case |
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49 |
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50 num = Asys.num; |
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51 den = Asys.den; |
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52 |
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53 tsam = sysgettsam(Asys); |
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54 inname = sysgetsignals(Asys,"in"); |
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55 outname = sysgetsignals(Asys,"out"); |
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56 |
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57 endfunction |
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58 |
