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1 ## Copyright (C) 1996, 1999 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} {} sysadd (@var{gsys}, @var{hsys}) |
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21 ## returns @var{sys} = @var{gsys} + @var{hsys}. |
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22 ## @itemize @bullet |
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23 ## @item Exits with |
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24 ## an error if @var{gsys} and @var{hsys} are not compatibly dimensioned. |
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25 ## @item Prints a warning message is system states have identical names; |
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26 ## duplicate names are given a suffix to make them unique. |
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27 ## @item @var{sys} input/output names are taken from @var{gsys}. |
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28 ## @end itemize |
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29 ## @example |
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30 ## @group |
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31 ## ________ |
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32 ## ----| gsys |--- |
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33 ## u | ---------- +| |
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34 ## ----- (_)----> y |
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35 ## | ________ +| |
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36 ## ----| hsys |--- |
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37 ## -------- |
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38 ## @end group |
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39 ## @end example |
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40 ## @end deftypefn |
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41 |
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42 ## Author: John Ingram <ingraje@eng.auburn.edu> |
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43 ## Created: July 1996 |
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44 ## Updated for variable number of arguments July 1999 A. S. Hodel |
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45 |
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46 function sys = sysadd (varargin) |
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47 |
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48 if(nargin < 1) |
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49 usage("sysadd: sys = sysysadd(Gsys{,Hsys, ...})"); |
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50 endif |
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51 |
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52 ## collect all arguments |
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53 arglist = {}; |
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54 for kk=1:nargin |
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55 arglist{kk} = varargin{kk}; |
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56 if(!isstruct(arglist{kk})) |
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57 error("sysadd: argument %d is not a data structure",kk); |
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58 endif |
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59 endfor |
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60 |
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61 ## check system dimensions |
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62 [n,nz,mg,pg,Gyd] = sysdimensions(arglist{1}); |
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63 for kk=2:nargin |
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64 [n,nz,mh,ph,Hyd] = sysdimensions(arglist{kk}); |
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65 if(mg != mh) |
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66 error("arg 1 has %d inputs; arg %d has vs %d inputs",mg,kk,mh); |
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67 elseif(pg != ph) |
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68 error("arg 1 has %d outputs; arg %d has vs %d outputs",pg,kk,ph); |
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69 elseif(norm(Gyd - Hyd)) |
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70 warning("cannot add a discrete output to a continuous output"); |
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71 error("Output type mismatch: arguments 1 and %d\n",kk); |
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72 endif |
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73 endfor |
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74 |
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75 ## perform the add |
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76 if (nargin == 2) |
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77 Gsys = arglist{1}; |
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78 Hsys = arglist{2}; |
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79 |
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80 # check if adding scalar transfer functions with identical denoms |
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81 [Gn, Gnz, Gm, Gp] = sysdimensions(Gsys); |
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82 [Hn, Hnz, Hm, Hp] = sysdimensions(Hsys); |
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83 if ( Gm ==1 & Gp == 1 & Hm == 1 & Hp == 1 & Gn == Hn & Gnz == Hnz ) |
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84 # dimensions are compatible, check if can add |
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85 [Gnum,Gden,GT,Gin,Gout] = sys2tf(Gsys); |
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86 [Hnum,Hden,HT,Hin,Hout] = sys2tf(Hsys); |
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87 if (length(Hden) == length(Gden) ) |
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88 if( (Hden == Gden) & (HT == GT) ) |
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89 sys = tf(Gnum+Hnum,Gden,GT,Gin,Gout); |
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90 |
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91 return; # return prematurely since the add is done. |
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92 endif |
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93 endif |
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94 endif |
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95 |
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96 ## make sure in ss form |
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97 Gsys = sysupdate(Gsys,"ss"); |
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98 Hsys = sysupdate(Hsys,"ss"); |
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99 Gin = sysgetsignals(Gsys,"in"); |
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100 Gout = sysgetsignals(Gsys,"out"); |
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101 Hin = sysgetsignals(Hsys,"in"); |
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102 Hout = sysgetsignals(Hsys,"out"); |
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103 |
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104 ## change signal names to avoid warning messages from sysgroup |
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105 Gsys = syssetsignals(Gsys,"in",__sysdefioname__(length(Gin),"Gin_u")); |
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106 Gsys = syssetsignals(Gsys,"out",__sysdefioname__(length(Gout),"Gout_u")); |
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107 Hsys = syssetsignals(Hsys,"in",__sysdefioname__(length(Hin),"Hin_u")); |
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108 Hsys = syssetsignals(Hsys,"out",__sysdefioname__(length(Hout),"Hout_u")); |
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109 |
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110 sys = sysgroup(Gsys,Hsys); |
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111 |
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112 eyin = eye(mg); |
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113 eyout = eye(pg); |
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114 |
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115 sys = sysscale(sys,[eyout, eyout],[eyin;eyin],Gout,Gin); |
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116 |
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117 else |
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118 ## multiple systems (or a single system); combine together one by one |
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119 sys = arglist{1}; |
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120 for kk=2:length(arglist) |
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121 sys = sysadd(sys,arglist{kk}); |
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122 endfor |
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123 endif |
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124 |
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125 endfunction |
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126 |
