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1 # Copyright (C) 1996 John W. Eaton |
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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 02111-1307, USA. |
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18 |
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19 function zr = tzero (a, b, c, d, bal) |
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20 |
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21 # Usage: zr = tzero (a, b, c, d, bal) |
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22 # |
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23 # Compute the transmission zeros of a, b, c, d. |
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24 # |
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25 # bal = balancing option (see balance); default is "B". |
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26 # |
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27 # Needs to incorporate mvzero algorithm to isolate finite zeros. |
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28 |
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29 # Written by A. S. Hodel (scotte@eng.auburn.edu) August 1993. |
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30 |
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31 if (nargin == 4) |
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32 bal = "B"; |
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33 elseif (nargin != 5) |
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904
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34 error ("tzero: invalid number of arguments"); |
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60
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35 endif |
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36 |
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37 [n, m, p] = abcddim (a, b, c, d); |
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38 |
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39 if (n > 0 && m > 0 && p > 0) |
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40 if (m != p) |
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904
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41 warning ("tzero: number of inputs,outputs differ. squaring up"); |
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73
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42 if (p > m) |
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904
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43 warning (" by padding b and d with zeros."); |
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44 b = [b, (zeros (n, p-m))]; |
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45 d = [d, (zeros (p, p-m))]; |
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46 m = p; |
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47 else |
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904
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48 warning (" by padding c and d with zeros."); |
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49 c = [c; (zeros (m-p, n))]; |
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50 d = [d; (zeros (m-p, m))]; |
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51 p = m; |
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52 endif |
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904
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53 warning ("This is a kludge. Try again with SISO system."); |
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54 endif |
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55 ab = [-a, -b; c, d]; |
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56 bb = [(eye (n)), (zeros (n, m)); (zeros (p, n)), (zeros (p, m))]; |
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57 [ab, bb] = balance (ab, bb); |
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58 zr = -qzval (ab, bb); |
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59 else |
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904
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60 error ("tzero: a, b, c, d not compatible"); |
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60
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61 endif |
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62 |
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63 endfunction |
