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1 ## Copyright (C) 1996 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{dsys}, @var{Adc}, @var{Cdc}] =} sysdisc (@var{sys}) |
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21 ## |
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22 ## @strong{Inputs} |
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23 ## @var{sys} = system data structure |
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24 ## |
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25 ## @strong{Outputs} |
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26 ## @table @var |
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27 ## @item dsys |
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28 ## purely discrete portion of sys (returned empty if there is |
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29 ## no purely discrete path from inputs to outputs) |
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30 ## @item Adc |
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31 ## @itemx Cdc |
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32 ## connections from continuous states to discrete states and discrete |
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33 ## outputs, respectively. |
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34 ## @end table |
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35 ## |
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36 ## @end deftypefn |
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37 |
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38 function [dsys, Adc, Cdc] = sysdisc (sys) |
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39 |
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40 save_empty = empty_list_elements_ok; |
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41 empty_list_elements_ok = 1; |
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42 |
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43 if (nargin != 1) |
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44 usage("[dsys,Adc,Cdc] = sysdisc(sys)"); |
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45 elseif (!is_struct(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 continous 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 = ss2sys(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 empty_list_elements_ok = save_empty; |
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98 |
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99 endfunction |
