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1 ## Copyright (C) 1996, 1997 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 |
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7 ## the Free Software Foundation; either version 2, or (at your option) |
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8 ## any later version. |
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9 ## |
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10 ## Octave is distributed in the hope that it will be useful, but |
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 ## General Public License 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 |
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18 ## 02111-1307, USA. |
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19 |
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20 ## Usage: [n, m, p] = abcddim (a, b, c, d) |
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21 ## |
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22 ## Check for compatibility of the dimensions of the matrices defining |
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23 ## the linear system (a, b, c, d). |
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24 ## |
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25 ## Returns n = number of system states, |
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26 ## m = number of system inputs, |
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27 ## p = number of system outputs. |
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28 ## |
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29 ## Returns n = m = p = -1 if the system is not compatible. |
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30 |
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31 ## Author: A. S. Hodel <scotte@eng.auburn.edu> |
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32 ## Created: August 1993 |
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33 ## Adapted-By: jwe |
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34 |
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35 function [n, m, p] = abcddim (a, b, c, d) |
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36 |
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37 if (nargin != 4) |
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38 error ("usage: abcddim (a, b, c, d)"); |
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39 endif |
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40 |
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41 n = m = p = -1; |
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42 |
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43 [an, am] = size(a); |
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44 if (an != am) |
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45 error ("abcddim: a is not square"); |
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46 endif |
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47 |
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48 [bn, bm] = size(b); |
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49 if (bn != am) |
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50 error ("abcddim: a and b are not compatible"); |
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51 endif |
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52 |
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53 [cn, cm] = size(c); |
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54 if (cm != an) |
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55 error ("abcddim: a and c are not compatible"); |
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60
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56 endif |
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57 |
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58 [dn, dm] = size(d); |
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60
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59 if (cn != dn) |
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60 error ("abcddim: c and d are not compatible"); |
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60
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61 endif |
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62 |
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63 if (bm != dm) |
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64 error ("abcddim: b and d are not compatible"); |
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60
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65 endif |
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66 |
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67 n = an; |
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68 m = bm; |
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69 p = cn; |
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70 |
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71 endfunction |
