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1 ## Copyright (C) 1996, 2000, 2002, 2003, 2004, 2005, 2006, 2007 |
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2 ## Auburn University. All rights reserved. |
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3 ## |
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4 ## This file is part of Octave. |
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5 ## |
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6 ## Octave is free software; you can redistribute it and/or modify it |
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7 ## under the terms of the GNU General Public License as published by |
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8 ## the Free Software Foundation; either version 3 of the License, or (at |
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9 ## your option) any later version. |
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10 ## |
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11 ## Octave is distributed in the hope that it will be useful, but |
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12 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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14 ## General Public License for more details. |
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15 ## |
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16 ## You should have received a copy of the GNU General Public License |
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17 ## along with Octave; see the file COPYING. If not, see |
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18 ## <http://www.gnu.org/licenses/>. |
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19 |
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20 ## -*- texinfo -*- |
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21 ## @deftypefn {Function File} {[@var{dsys}, @var{adc}, @var{cdc}] =} sysdisc (@var{sys}) |
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22 ## |
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23 ## @strong{Input} |
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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 ## @end table |
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28 ## |
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29 ## @strong{Outputs} |
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30 ## @table @var |
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31 ## @item dsys |
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32 ## Purely discrete portion of sys (returned empty if there is |
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33 ## no purely discrete path from inputs to outputs). |
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34 ## @item adc |
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35 ## @itemx cdc |
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36 ## Connections from continuous states to discrete states and discrete |
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37 ## outputs, respectively. |
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38 ## @end table |
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39 ## @end deftypefn |
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40 |
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41 function [dsys, Adc, Cdc] = sysdisc (sys) |
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42 |
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43 if (nargin != 1) |
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44 print_usage (); |
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45 elseif (!isstruct(sys)) |
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46 error("sys must be in system data structure form"); |
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47 endif |
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48 |
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49 sys = sysupdate (sys, "ss"); |
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50 [n_tot, st_c, st_d, y_c, y_d] = __syscont_disc__ (sys); # get ranges |
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51 |
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52 ## assume there's nothing there; build partitions as appropriate |
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53 Add = Adc = Bdd = Cdd = Cdc = Ddd = []; |
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54 |
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55 if(isempty(st_d) & isempty(y_d)) |
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56 error("sysdisc: expecting discrete states and/or continuous outputs"); |
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57 elseif (isempty(st_d)) |
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58 warning("sysdisc: no discrete states"); |
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59 elseif(isempty(y_d)) |
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60 warning("sysdisc: no discrete outputs"); |
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61 endif |
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62 |
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63 [aa,bb,cc,dd] = sys2ss(sys); |
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64 if(!isempty(st_d) ) |
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65 Add = aa( st_d , st_d); |
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66 stname = sysgetsignals(sys,"st",st_d); |
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67 Bdd = bb( st_d , :); |
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68 if(!isempty(st_c)) |
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69 Adc = aa( st_d , st_c); |
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70 endif |
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71 if(!isempty(y_d)) |
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72 Cdd = cc(y_d , st_d); |
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73 endif |
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74 else |
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75 stname = []; |
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76 endif |
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77 if(!isempty(y_d)) |
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78 Ddd = dd(y_d , :); |
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79 outname = sysgetsignals(sys,"out",y_d); |
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80 if(!isempty(st_c)) |
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81 Cdc = cc(y_d , st_c); |
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82 endif |
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83 else |
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84 outname=[]; |
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85 endif |
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86 inname = sysgetsignals(sys,"in"); |
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87 outlist = 1:rows(outname); |
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88 |
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89 if(!isempty(outname)) |
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90 tsam = sysgettsam(sys); |
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91 [nc,nz] = sysdimensions(sys); |
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92 dsys = ss(Add,Bdd,Cdd,Ddd,tsam,0,nz,stname,inname,outname,outlist); |
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93 else |
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94 dsys=[]; |
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95 endif |
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96 |
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97 endfunction |
