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1 ## Copyright (C) 1993 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{zr} =} tzero2 (@var{a}, @var{b}, @var{c}, @var{d}, @var{bal}) |
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21 ## Compute the transmission zeros of @var{a}, @var{b}, @var{c}, @var{d}. |
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22 ## |
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23 ## @var{bal} = balancing option (see balance); default is @code{"B"}. |
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24 ## |
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25 ## Needs to incorporate @command{mvzero} algorithm to isolate finite zeros; |
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26 ## use @command{tzero} instead. |
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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 ## Created: August 1993 |
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31 |
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32 function zr = tzero2 (a, b, c, d, bal) |
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33 |
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34 if (nargin == 4) |
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35 bal = "B"; |
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36 elseif (nargin != 5) |
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37 error ("tzero: invalid number of arguments"); |
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38 endif |
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39 |
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40 [n, m, p] = abcddim (a, b, c, d); |
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41 |
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42 if (n > 0 && m > 0 && p > 0) |
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43 if (m != p) |
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44 fprintf (stderr, "tzero: number of inputs,outputs differ. squaring up"); |
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45 if (p > m) |
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46 fprintf (stderr, " by padding b and d with zeros."); |
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47 b = [b, (zeros (n, p-m))]; |
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48 d = [d, (zeros (p, p-m))]; |
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49 m = p; |
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50 else |
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51 fprintf (stderr, " by padding c and d with zeros."); |
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52 c = [c; (zeros (m-p, n))]; |
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53 d = [d; (zeros (m-p, m))]; |
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54 p = m; |
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55 endif |
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56 fprintf (stderr, "This is a kludge. Try again with SISO system."); |
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57 endif |
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58 ab = [-a, -b; c, d]; |
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59 bb = [(eye (n)), (zeros (n, m)); (zeros (p, n)), (zeros (p, m))]; |
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60 [ab,bb] = balance (ab, bb); |
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61 zr = -qz (ab, bb); |
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62 else |
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63 error ("tzero: a, b, c, d not compatible. exiting"); |
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64 endif |
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65 |
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66 endfunction |
