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1 ## Copyright (C) 1996, 1999, 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} {} sysadd (@var{gsys}, @var{hsys}) |
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22 ## returns @var{sys} = @var{gsys} + @var{hsys}. |
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23 ## @itemize @bullet |
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24 ## @item Exits with |
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25 ## an error if @var{gsys} and @var{hsys} are not compatibly dimensioned. |
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26 ## @item Prints a warning message is system states have identical names; |
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27 ## duplicate names are given a suffix to make them unique. |
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28 ## @item @var{sys} input/output names are taken from @var{gsys}. |
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29 ## @end itemize |
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30 ## @example |
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31 ## @group |
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32 ## ________ |
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33 ## ----| gsys |--- |
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34 ## u | ---------- +| |
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35 ## ----- (_)----> y |
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36 ## | ________ +| |
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37 ## ----| hsys |--- |
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38 ## -------- |
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39 ## @end group |
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40 ## @end example |
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41 ## @end deftypefn |
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42 |
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43 ## Author: John Ingram <ingraje@eng.auburn.edu> |
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44 ## Created: July 1996 |
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45 ## Updated for variable number of arguments July 1999 A. S. Hodel |
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46 |
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47 function sys = sysadd (varargin) |
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48 |
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49 if(nargin < 1) |
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50 print_usage (); |
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51 endif |
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52 |
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53 ## collect all arguments |
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54 arglist = {}; |
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55 for kk=1:nargin |
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56 arglist{kk} = varargin{kk}; |
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57 if(!isstruct(arglist{kk})) |
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58 error("sysadd: argument %d is not a data structure",kk); |
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59 endif |
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60 endfor |
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61 |
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62 ## check system dimensions |
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63 [n,nz,mg,pg,Gyd] = sysdimensions(arglist{1}); |
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64 for kk=2:nargin |
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65 [n,nz,mh,ph,Hyd] = sysdimensions(arglist{kk}); |
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66 if(mg != mh) |
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67 error("arg 1 has %d inputs; arg %d has vs %d inputs",mg,kk,mh); |
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68 elseif(pg != ph) |
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69 error("arg 1 has %d outputs; arg %d has vs %d outputs",pg,kk,ph); |
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70 elseif(norm(Gyd - Hyd)) |
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71 warning("cannot add a discrete output to a continuous output"); |
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72 error("Output type mismatch: arguments 1 and %d\n",kk); |
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73 endif |
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74 endfor |
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75 |
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76 ## perform the add |
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77 if (nargin == 2) |
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78 Gsys = arglist{1}; |
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79 Hsys = arglist{2}; |
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80 |
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81 # check if adding scalar transfer functions with identical denoms |
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82 [Gn, Gnz, Gm, Gp] = sysdimensions(Gsys); |
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83 [Hn, Hnz, Hm, Hp] = sysdimensions(Hsys); |
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84 if ( Gm ==1 & Gp == 1 & Hm == 1 & Hp == 1 & Gn == Hn & Gnz == Hnz ) |
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85 # dimensions are compatible, check if can add |
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86 [Gnum,Gden,GT,Gin,Gout] = sys2tf(Gsys); |
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87 [Hnum,Hden,HT,Hin,Hout] = sys2tf(Hsys); |
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88 if (length(Hden) == length(Gden) ) |
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89 if( (Hden == Gden) & (HT == GT) ) |
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90 sys = tf(Gnum+Hnum,Gden,GT,Gin,Gout); |
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91 |
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92 return; # return prematurely since the add is done. |
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93 endif |
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94 endif |
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95 endif |
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96 |
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97 ## make sure in ss form |
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98 Gsys = sysupdate(Gsys,"ss"); |
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99 Hsys = sysupdate(Hsys,"ss"); |
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100 Gin = sysgetsignals(Gsys,"in"); |
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101 Gout = sysgetsignals(Gsys,"out"); |
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102 Hin = sysgetsignals(Hsys,"in"); |
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103 Hout = sysgetsignals(Hsys,"out"); |
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104 |
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105 ## change signal names to avoid warning messages from sysgroup |
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106 Gsys = syssetsignals(Gsys,"in",__sysdefioname__(length(Gin),"Gin_u")); |
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107 Gsys = syssetsignals(Gsys,"out",__sysdefioname__(length(Gout),"Gout_u")); |
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108 Hsys = syssetsignals(Hsys,"in",__sysdefioname__(length(Hin),"Hin_u")); |
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109 Hsys = syssetsignals(Hsys,"out",__sysdefioname__(length(Hout),"Hout_u")); |
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110 |
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111 sys = sysgroup(Gsys,Hsys); |
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112 |
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113 eyin = eye(mg); |
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114 eyout = eye(pg); |
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115 |
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116 sys = sysscale(sys,[eyout, eyout],[eyin;eyin],Gout,Gin); |
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117 |
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118 else |
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119 ## multiple systems (or a single system); combine together one by one |
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120 sys = arglist{1}; |
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121 for kk=2:length(arglist) |
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122 sys = sysadd(sys,arglist{kk}); |
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123 endfor |
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124 endif |
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125 |
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126 endfunction |
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127 |
