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1 # Copyright (C) 1996,1998 A. Scottedward Hodel |
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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, 675 Mass Ave, Cambridge, MA 02139, USA. |
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18 |
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19 function retsys = sysdup(Asys,output_list,input_list) |
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20 # function retsys = sysdup(Asys,output_list,input_list) |
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21 # Duplicate specified input/output connections of a system |
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22 # |
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23 # |
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24 # inputs: |
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25 # Asys: system data structure (see ss2sys) |
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26 # output_list,input_list: list of connections indices; |
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27 # duplicates are made of y(output_list(ii)) and u(input_list(ii)). |
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28 # output: retsys: resulting closed loop system: |
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29 # duplicated i/o names are appended with a "+" suffix. |
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30 # |
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31 # Operation: sysdup creates copies of selected inputs and outputs as |
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32 # shown below. u1/y1 is the set of original inputs/outputs, and |
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33 # u2,y2 is the set of duplicated inputs/outputs in the order specified |
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34 # in input_list,output_list, respectively |
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35 # ____________________ |
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36 # | | |
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37 # u1 ----->| |----> y1 |
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38 # | Asys | |
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39 # | | |
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40 # u2 ------------->| |----->y2 |
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41 # (input_list) | | (output_list) |
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42 # -------------------- |
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43 |
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44 # A. S. Hodel August 1995 |
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45 # modified by John Ingram July 1996 |
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46 # $Revision: 2.0.0.0 $ |
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47 |
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48 save_val = implicit_str_to_num_ok; # save for later |
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49 implicit_str_to_num_ok = 1; |
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50 |
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51 if( nargin != 3) |
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52 usage("retsys = sysdup(Asys,output_list,input_list)"); |
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53 endif |
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54 |
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55 if( !is_struct(Asys)) |
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56 error("Asys must be a system data structure (see ss2sys, tf2sys, or zp2sys)") |
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57 endif |
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58 |
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59 Asys = sysupdate(Asys,"ss"); |
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60 [nn,nz,mm,pp] = sysdimensions(Asys); |
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61 [aa,bb,cc,dd] = sys2ss(Asys); |
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62 |
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63 # first duplicate inputs |
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64 if(is_vector(input_list)) |
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65 for ii=1:length(input_list); |
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66 bb(:,mm+ii) = bb(:,input_list(ii)); |
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67 dd(:,mm+ii) = dd(:,input_list(ii)); |
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68 end |
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69 elseif(!isempty(input_list)) |
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70 error("input_list must be a vector or empty"); |
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71 endif |
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72 |
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73 |
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74 # now duplicate outputs |
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75 osize = min(size(output_list)); |
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76 if(osize == 1) |
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77 for ii=1:length(output_list); |
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78 cc(pp+ii,:) = cc(output_list(ii),:); |
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79 dd(pp+ii,:) = dd(output_list(ii),:); |
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80 end |
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81 elseif(osize != 0) |
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82 error("output_list must be a vector or empty"); |
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83 endif |
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84 |
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85 [stnam,innam,outnam,yd] = sysgetsignals(Asys); |
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86 tsam = sysgettsam(Asys); |
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87 |
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88 # pack system and then rename signals |
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89 retsys = ss2sys(aa,bb,cc,dd,tsam,nn,nz); |
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90 retsys = syssetsignals(retsys,"in",innam,1:mm); |
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91 retsys = syssetsignals(retsys,"out",outnam,1:pp); |
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92 retsys = syssetsignals(retsys,"yd",yd,1:pp); |
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93 |
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94 # update added input names |
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95 for ii=(mm+1):(mm+length(input_list)) |
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96 onum = input_list(ii-mm); |
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97 strval = sprintf("%s(dup)",sysgetsignals(retsys,"in",onum,1) ); |
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98 retsys = syssetsignals(retsys,"in",strval,ii); |
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99 endfor |
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100 |
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101 # update added output names/discrete flags |
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102 # give default names to the added outputs |
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103 for jj=(pp+1):(pp+length(output_list)) |
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104 onum = output_list(jj-pp); |
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105 strval = sprintf("%s(dup)",sysgetsignals(retsys,"out",onum,1) ); |
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106 retsys = syssetsignals(retsys,"out",strval,jj); |
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107 dflg = sysgetsignals(retsys,"yd",onum); |
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108 retsys = syssetsignals(retsys,"yd",dflg,jj); |
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109 endfor |
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110 |
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111 implicit_str_to_num_ok = save_val; # restore value |
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112 |
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113 endfunction |
