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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 return; |
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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", |
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106 __sysdefioname__ (length (Gin), "Gin_u")); |
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107 |
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108 Gsys = syssetsignals (Gsys, "out", |
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109 __sysdefioname__ (length (Gout), "Gout_u")); |
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110 |
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111 Hsys = syssetsignals (Hsys, "in", |
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112 __sysdefioname__ (length (Hin), "Hin_u")); |
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113 |
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114 Hsys = syssetsignals (Hsys, "out", |
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115 __sysdefioname__ (length (Hout), "Hout_u")); |
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116 |
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117 sys = sysgroup (Gsys, Hsys); |
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118 |
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119 eyin = eye (mg); |
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120 eyout = eye (pg); |
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121 |
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122 sys = sysscale (sys, [eyout, eyout], [eyin; eyin], Gout, Gin); |
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123 |
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124 else |
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125 ## multiple systems (or a single system); combine together one by one |
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126 sys = arglist{1}; |
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127 for kk = 2:length(arglist) |
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128 sys = sysadd (sys, arglist{kk}); |
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129 endfor |
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130 endif |
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131 |
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132 endfunction |
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133 |
