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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 function [dsys,Adc,Cdc] = sysdisc(sys) |
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20 # function [dsys,Adc,Cdc] = sysdisc(sys) |
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21 # inputs: sys = system data structure |
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22 # outputs: |
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23 # dsys: purely discrete portion of sys (returned empty if there is |
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24 # no purely discrete path from inputs to outputs) |
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25 # Adc, Cdc: connections from continuous states to discrete states/discrete |
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26 # outputs, respectively. |
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27 # |
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28 |
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29 save_val = implicit_str_to_num_ok; # save for later |
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30 save_empty = empty_list_elements_ok; |
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31 empty_list_elements_ok = implicit_str_to_num_ok = 1; |
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32 |
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33 |
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34 if (nargin != 1) |
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35 usage("[dsys,Adc,Cdc] = sysdisc(sys)"); |
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36 elseif (!is_struct(sys)) |
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37 error("sys must be in system data structure form"); |
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38 endif |
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39 |
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40 sys = sysupdate(sys,"ss"); |
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41 [n_tot,st_c,st_d,y_c,y_d] = syscont_disc(sys); # get ranges |
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42 |
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43 # assume there's nothing there; build partitions as appropriate |
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44 Add = Adc = Bdd = Cdd = Cdc = Ddd = []; |
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45 |
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46 if(isempty(st_d) & isempty(y_d)) |
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47 error("sysdisc: expecting discrete states and/or continous outputs"); |
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48 elseif (isempty(st_d)) |
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49 warning("sysdisc: no discrete states"); |
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50 elseif(isempty(y_d)) |
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51 warning("sysdisc: no discrete outputs"); |
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52 endif |
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53 |
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54 [aa,bb,cc,dd] = sys2ss(sys); |
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55 if(!isempty(st_d) ) |
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56 Add = aa( st_d , st_d); |
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57 stname = sysgetsignals(sys,"st",st_d); |
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58 Bdd = bb( st_d , :); |
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59 if(!isempty(st_c)) |
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60 Adc = aa( st_d , st_c); |
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61 endif |
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62 if(!isempty(y_d)) |
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63 Cdd = cc(y_d , st_d); |
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64 endif |
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65 else |
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66 stname = []; |
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67 endif |
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68 if(!isempty(y_d)) |
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69 Ddd = dd(y_d , :); |
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70 outname = sysgetsignals(sys,"out",y_d); |
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71 if(!isempty(st_c)) |
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72 Cdc = cc(y_d , st_c); |
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73 endif |
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74 else |
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75 outname=[]; |
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76 endif |
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77 inname = sysgetsignals(sys,"in"); |
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78 outlist = 1:rows(outname); |
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79 |
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80 if(!isempty(outname)) |
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81 tsam = sysgettsam(sys); |
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82 [nc,nz] = sysdimensions(sys); |
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83 dsys = ss2sys(Add,Bdd,Cdd,Ddd,tsam,0,nz,stname,inname,outname,outlist); |
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84 else |
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85 dsys=[]; |
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86 endif |
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87 implicit_str_to_num_ok = save_val; # restore value |
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88 empty_list_elements_ok = save_empty; |
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89 |
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90 endfunction |
