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1 ## Copyright (C) 1996, 1998 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 |
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7 ## the Free Software Foundation; either version 3 of the License, or (at |
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8 ## your option) any later version. |
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9 ## |
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10 ## Octave is distributed in the hope that it will be useful, but |
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 ## General Public License 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, see |
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17 ## <http://www.gnu.org/licenses/>. |
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18 |
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19 ## -*- texinfo -*- |
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20 ## @deftypefn {Function File} {@var{retsys} =} sysscale (@var{sys}, @var{outscale}, @var{inscale}, @var{outname}, @var{inname}) |
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21 ## scale inputs/outputs of a system. |
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22 ## |
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23 ## @strong{Inputs} |
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24 ## @table @var |
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25 ## @item sys |
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26 ## Structured system. |
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27 ## @item outscale |
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28 ## @itemx inscale |
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29 ## Constant matrices of appropriate dimension. |
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30 ## @item outname |
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31 ## @itemx inname |
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32 ## Lists of strings with the names of respectively outputs and inputs. |
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33 ## @end table |
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34 ## |
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35 ## @strong{Output} |
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36 ## @table @var |
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37 ## @item retsys |
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38 ## resulting open loop system: |
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39 ## @example |
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40 ## ----------- ------- ----------- |
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41 ## u --->| inscale |--->| sys |--->| outscale |---> y |
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42 ## ----------- ------- ----------- |
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43 ## @end example |
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44 ## @end table |
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45 ## If the input names and output names (each a list of strings) |
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46 ## are not given and the scaling matrices |
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47 ## are not square, then default names will be given to the inputs and/or |
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48 ## outputs. |
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49 ## |
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50 ## A warning message is printed if outscale attempts to add continuous |
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51 ## system outputs to discrete system outputs; otherwise @var{yd} is |
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52 ## set appropriately in the returned value of @var{sys}. |
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53 ## @end deftypefn |
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54 |
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55 ## Author: A. S. Hodel <a.s.hodel@eng.auburn.edu> |
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56 ## Created: August 1995 |
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57 ## modified by John Ingram 7-15-96 |
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58 |
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59 function sys = sysscale (sys, outscale, inscale, outname, inname) |
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60 |
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61 if( (nargin < 3) || (nargin > 5) ) |
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62 print_usage (); |
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63 elseif (!isstruct(sys)) |
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64 error("sys must be a structured system"); |
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65 endif |
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66 |
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67 [nn,nz,mm,pp] = sysdimensions(sys); |
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68 |
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69 ## check for omitted scales |
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70 if(isempty(outscale)) outscale = eye(pp); endif |
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71 if(isempty(inscale)) inscale = eye(mm); endif |
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72 |
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73 ## check dimensions of scaling matrices |
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74 if(mm!=rows(inscale)) |
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75 error("inscale(%dx%d) should have %d rows(# system inputs)", ... |
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76 rows(inscale),columns(inscale),mm); |
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77 elseif( pp != columns(outscale) ) |
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78 error("outscale(%dx%d) should have %d columns(# system outputs)", ... |
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79 rows(outscale), columns(outscale),pp); |
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80 endif |
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81 |
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82 sysyd = sysgetsignals(sys,"yd"); |
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83 outc = find(sysyd==0); |
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84 outd = find(sysyd==1); |
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85 |
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86 if(length(outc) & length(outd)) |
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87 for ii = 1:rows(outscale) |
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88 nci = norm(outscale(ii,outc)); |
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89 ndi = norm(outscale(ii,outd)); |
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90 |
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91 if( nci & ndi) |
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92 warning("sysscale: outscale(%d,:) sums continuous and discrete outputs; setting output to cont",ii) |
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93 sysyd(ii) = 0; |
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94 else |
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95 sysyd(ii) = (ndi != 0); |
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96 endif |
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97 endfor |
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98 else |
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99 sysyd = ones(1,rows(outscale))*( length(outd) > 0); |
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100 endif |
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101 |
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102 ## check for SISO system type |
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103 if strcmp(sysgettype(sys),"tf") |
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104 [num,den,tsam,innam,outnam] = sys2tf(sys); |
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105 num = num*inscale*outscale; |
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106 sys = tf(num,den,tsam,innam,outnam); |
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107 return |
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108 elseif strcmp(sysgettype(sys),"zp") |
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109 [zer,pol,kk,tsam,innam,outnam] = sys2zp(sys); |
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110 kk = kk*inscale*outscale; |
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111 sys = zp(zer,pol,k,tsam,innam,outnam); |
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112 return |
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113 endif |
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114 |
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115 ## it's a state space system... |
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116 |
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117 [sysa,sysb,sysc,sysd,systsam, ... |
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118 sysn,sysnz,sysstname,sysinname,sysoutname,oldyd] = sys2ss(sys); |
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119 |
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120 sysb = sysb*inscale; |
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121 sysc = outscale*sysc; |
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122 sysd = outscale*sysd*inscale; |
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123 |
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124 if( !issquare(outscale) ) |
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125 ## strip extra output names (if any) |
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126 sysoutname = sysoutname(1:min(rows(outscale),columns(outscale))); |
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127 if( nargin < 4) |
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128 warning("sysscale: outscale not square, outname not specified"); |
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129 warning("sysscale: using default output names"); |
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130 outname = __sysdefioname__(rows(sysc),"y"); |
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131 endif |
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132 else |
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133 outname = sysoutname; |
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134 endif |
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135 if( !issquare(inscale) ) |
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136 ## strip extra output names (if any) |
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137 sysinname = sysinname(1:min(rows(inscale),columns(inscale))); |
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138 if(nargin < 5) |
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139 warning("sysscale: inscale not square, inname not specified"); |
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140 warning("sysscale: using default input names"); |
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141 inname = __sysdefioname__(columns(sysb),"u"); |
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142 endif |
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143 else |
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144 inname = sysgetsignals(sys,"in"); |
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145 endif |
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146 |
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147 sys = ss(sysa,sysb,sysc,sysd,systsam,nn,nz,sysstname, ... |
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148 inname,outname,find(sysyd==1)); |
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149 |
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150 endfunction |
