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1 ## Copyright (C) 1996,1998 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{n}, @var{nz}, @var{m}, @var{p},@var{yd}] =} sysdimensions (@var{sys}@{, @var{opt}@}) |
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21 ## return the number of states, inputs, and/or outputs in the system @var{sys}. |
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22 ## |
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23 ## @strong{Inputs} |
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24 ## @table @var |
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25 ## @item sys |
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26 ## system data structure |
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27 ## |
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28 ## @item opt |
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29 ## String indicating which dimensions are desired. Values: |
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30 ## @table @code |
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31 ## @item "all" |
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32 ## (default) return all parameters as specified under Outputs below. |
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33 ## |
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34 ## @item "cst" |
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35 ## return @var{n}= number of continuous states |
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36 ## |
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37 ## @item "dst" |
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38 ## return @var{n}= number of discrete states |
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39 ## |
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40 ## @item "in" |
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41 ## return @var{n}= number of inputs |
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42 ## |
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43 ## @item "out" |
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44 ## return @var{n}= number of outputs |
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45 ## @end table |
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46 ## @end table |
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47 ## |
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48 ## @strong{Outputs} |
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49 ## @table @var |
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50 ## @item n |
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51 ## number of continuous states (or individual requested dimension as specified |
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52 ## by @var{opt}). |
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53 ## @item nz |
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54 ## number of discrete states |
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55 ## @item m |
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56 ## number of system inputs |
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57 ## @item p |
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58 ## number of system outputs |
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59 ## @item yd |
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60 ## binary vector; @var{yd}(@var{ii}) is nonzero if output @var{ii} is |
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61 ## discrete. |
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62 ## @math{yd(ii) = 0} if output @var{ii} is continous |
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63 ## @end table |
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64 ## |
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65 ## @end deftypefn |
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66 |
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67 ## See also: sysgetsignals, sysgettsam |
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68 |
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69 function [n, nz, m, p, yd] = sysdimensions (sys, opt) |
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70 if(nargout > 5 | nargin < 1 | nargin > 2) |
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71 usage("[n,nz,m,p[,yd]] = sysdimensions(sys{,opt})"); |
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72 elseif(!is_struct(sys)) |
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73 usage("[n,nz,m,p] = sysdimensions(sys)"); |
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74 elseif(nargin == 1) |
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75 opt = "all"; |
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76 endif |
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77 |
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78 n = sys.n; |
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79 nz = sys.nz; |
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80 m = length(sysgetsignals(sys,"in")); |
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81 p = length(sysgetsignals(sys,"out")); |
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82 yd = sys.yd; |
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83 legal_options = list("all","cst","dst","st","in","out"); |
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84 legal_values = list(n,n,nz,n+nz,m,p); |
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85 |
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86 legal_opt = 0; |
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87 for ii=1:length(legal_options) |
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88 if(strcmp(nth(legal_options,ii),opt)) |
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89 n = nth(legal_values,ii); |
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90 legal_opt = 1; |
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91 if(ii > 1 & nargout > 1) |
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92 warning("opt=%s, %d output arguments requested",opt,nargout); |
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93 endif |
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94 endif |
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95 endfor |
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96 if(!legal_opt) |
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97 error("illegal option passed = %s",opt); |
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98 endif |
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99 |
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100 endfunction |
