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1 ## Copyright (C) 1997 Kai P. Mueller |
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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} {} is_abcd (@var{a}, @var{b}, @var{c}, @var{d}) |
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21 ## Returns @var{retval} = 1 if the dimensions of @var{a}, @var{b}, |
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22 ## @var{c}, @var{d} are compatible, otherwise @var{retval} = 0 with an |
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23 ## appropriate diagnostic message printed to the screen. The matrices |
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24 ## b, c, or d may be omitted. |
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25 ## @end deftypefn |
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26 ## @seealso{abcddim} |
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27 |
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28 ## Author: Kai P. Mueller <mueller@ifr.ing.tu-bs.de> |
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29 ## Created: November 4, 1997 |
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30 ## based on is_controllable.m of Scottedward Hodel |
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31 |
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32 function retval = is_abcd (a, b, c, d) |
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33 |
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34 retval = 0; |
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35 switch (nargin) |
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36 case (1) |
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37 ## A only |
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38 [na, ma] = size(a); |
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39 if (na != ma) |
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40 disp("Matrix A ist not square.") |
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41 endif |
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42 case (2) |
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43 ## A, B only |
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44 [na, ma] = size(a); [nb, mb] = size(b); |
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45 if (na != ma) |
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46 disp("Matrix A ist not square.") |
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47 return; |
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48 endif |
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49 if (na != nb) |
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50 disp("A and B column dimension different.") |
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51 return; |
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52 endif |
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53 case (3) |
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54 ## A, B, C only |
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55 [na, ma] = size(a); [nb, mb] = size(b); [nc, mc] = size(c); |
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56 if (na != ma) |
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57 disp("Matrix A ist not square.") |
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58 return; |
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59 endif |
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60 if (na != nb) |
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61 disp("A and B column dimensions not compatible.") |
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62 return; |
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63 endif |
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64 if (ma != mc) |
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65 disp("A and C row dimensions not compatible.") |
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66 return; |
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67 endif |
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68 case (4) |
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69 ## all matrices A, B, C, D |
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70 [na, ma] = size(a); [nb, mb] = size(b); |
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71 [nc, mc] = size(c); [nd, md] = size(d); |
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72 if (na != ma) |
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73 disp("Matrix A ist not square.") |
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74 return; |
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75 endif |
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76 if (na != nb) |
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77 disp("A and B column dimensions not compatible.") |
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78 return; |
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79 endif |
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80 if (ma != mc) |
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81 disp("A and C row dimensions not compatible.") |
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82 return; |
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83 endif |
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84 if (mb != md) |
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85 disp("B and D row dimensions not compatible.") |
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86 return; |
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87 endif |
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88 if (nc != nd) |
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89 disp("C and D column dimensions not compatible.") |
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90 return; |
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91 endif |
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92 otherwise |
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93 usage("retval = is_abcd(a [, b, c, d])") |
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94 endswitch |
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95 ## all tests passed, signal ok. |
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96 retval = 1; |
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97 endfunction |
