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1 ## Copyright (C) 1996 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{zer}, @var{pol}, @var{k}, @var{tsam}, @var{inname}, @var{outname}] =} sys2zp (@var{sys}) |
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21 ## Extract zero/pole/leading coefficient information from a system data |
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22 ## structure |
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23 ## |
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24 ## See @ref{zp2sys} 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=ss2sys([1 -2; -1.1,-2.1],[0;1],[1 1]); |
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29 ## octave:2> [zer,pol,k] = sys2zp(sys) |
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30 ## zer = 3.0000 |
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31 ## pol = |
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32 ## -2.6953 |
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33 ## 1.5953 |
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34 ## k = 1 |
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35 ## @end example |
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36 ## @end deftypefn |
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37 |
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38 ## Author: John Ingram <ingraje@eng.auburn.edu> |
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39 ## Created: July 15, 1996 |
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40 |
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41 function [zer, pol, k, tsam, inname, outname] = sys2zp (sys) |
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42 |
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43 if(nargin != 1) |
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44 usage("[zer,pol,k,tsam,inname,outname] = sys2zp(sys)"); |
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45 elseif( !is_struct(sys)) |
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46 error("sysconnect: sys must be in system data structure form") |
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47 elseif (! is_siso(sys) ) |
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48 [n, nz, m, p] = sysdimensions(sys); |
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49 error(["system is not SISO (",num2str(m)," inputs, ... |
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50 ", num2str(p)," outputs"]); |
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51 endif |
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52 |
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53 ## update zero-pole form |
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54 sys = sysupdate(sys,"zp"); |
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55 |
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56 zer = sys.zer; |
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57 pol = sys.pol; |
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58 k = sys.k; |
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59 tsam = sysgettsam(sys); |
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60 inname = sysgetsignals(sys,"in"); |
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61 outname = sysgetsignals(sys,"out"); |
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62 |
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63 endfunction |
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64 |
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65 |
