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1 ## Copyright (C) 1996 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, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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18 ## 02110-1301, USA. |
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19 |
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20 ## -*- texinfo -*- |
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21 ## @deftypefn {Function File} {} sysupdate (@var{sys}, @var{opt}) |
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22 ## Update the internal representation of a system. |
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23 ## |
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24 ## @strong{Inputs} |
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25 ## @table @var |
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26 ## @item sys: |
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27 ## system data structure |
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28 ## @item opt |
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29 ## string: |
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30 ## @table @code |
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31 ## @item "tf" |
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32 ## update transfer function form |
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33 ## @item "zp" |
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34 ## update zero-pole form |
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35 ## @item "ss" |
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36 ## update state space form |
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37 ## @item "all" |
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38 ## all of the above |
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39 ## @end table |
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40 ## @end table |
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41 ## |
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42 ## @strong{Outputs} |
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43 ## @table @var |
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44 ## @item retsys |
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45 ## Contains union of data in sys and requested data. |
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46 ## If requested data in @var{sys} is already up to date then @var{retsys}=@var{sys}. |
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47 ## @end table |
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48 ## |
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49 ## Conversion to @command{tf} or @command{zp} exits with an error if the system is |
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50 ## mixed continuous/digital. |
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51 ## @end deftypefn |
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52 ## |
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53 ## @seealso{tf, ss, zp, sysout, sys2ss, sys2tf, and sys2zp} |
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54 |
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55 ## Author: John Ingram <ingraje@eng.auburn.edu> |
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56 ## Created: July 9, 1996 |
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57 |
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58 function sys = sysupdate (sys, opt) |
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59 |
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60 ## check for correct number of inputs |
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61 if (nargin != 2) |
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62 usage("newsys = sysupdate(sys,opt)"); |
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63 elseif(! isstruct(sys) ) |
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64 error("1st argument must be system data structure") |
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65 elseif(! (strcmp(opt,"tf") + strcmp(opt,"zp") + ... |
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66 strcmp(opt,"ss") + strcmp(opt,"all")) ) |
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67 error("2nd argument must be \"tf\", \"zp\", \"ss\", or \"all\""); |
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68 endif |
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69 |
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70 ## check to make sure not trying to make a SISO system out of a MIMO sys |
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71 if ( (strcmp(opt,"tf") + strcmp(opt,"zp") + strcmp(opt,"all")) ... |
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72 & strcmp(sysgettype(sys),"ss") & (! is_siso(sys) ) ) |
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73 error("MIMO -> SISO update requested"); |
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74 endif |
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75 |
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76 ## update transfer function if desired |
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77 if ( (strcmp(opt, "tf") + strcmp(opt,"all"))&& (!sys.sys(2))) |
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78 ## check to make sure the system is not discrete and continuous |
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79 is_digital(sys); |
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80 |
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81 ## if original system zero-pole |
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82 if strcmp(sysgettype(sys),"zp") |
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83 [sys.num,sys.den] = zp2tf(sys.zer,sys.pol,sys.k); |
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84 sys.sys(2) = 1; |
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85 ## if original system is state-space |
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86 elseif(sys.sys(1) == 2) |
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87 [sys.num,sys.den] = ss2tf(sys.a,sys.b,sys.c,sys.d); |
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88 sys.sys(2) = 1; |
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89 endif |
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90 endif |
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91 |
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92 |
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93 ## update zero-pole if desired |
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94 if ( (strcmp(opt, "zp") + strcmp(opt,"all")) && (! sys.sys(3)) ) |
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95 ## check to make sure the system is not discrete and continuous |
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96 is_digital(sys); |
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97 |
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98 ## original system is transfer function |
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99 if (sys.sys(1) == 0) |
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100 [sys.zer,sys.pol,sys.k] = tf2zp(sys.num,sys.den); |
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101 sys.sys(3) = 1; |
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102 ## original system is state-space |
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103 |
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104 elseif(sys.sys(1) == 2) |
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105 [sys.zer,sys.pol,sys.k] = ss2zp(sys.a,sys.b,sys.c,sys.d); |
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106 sys.sys(3) = 1; |
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107 endif |
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108 |
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109 endif |
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110 |
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111 ## update state-space if desired |
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112 if ( (strcmp(opt, "ss") + strcmp(opt,"all")) && (! sys.sys(4)) ) |
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113 ## original system is transfer function |
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114 if (sys.sys(1) == 0) |
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115 [sys.a,sys.b,sys.c,sys.d] = tf2ss(sys.num,sys.den); |
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116 sys.sys(4) = 1; |
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117 ## original system is zero-pole |
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118 elseif(sys.sys(1) == 1) |
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119 [sys.a,sys.b,sys.c,sys.d] = zp2ss(sys.zer,sys.pol,sys.k); |
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120 sys.sys(4) = 1; |
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121 endif |
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122 |
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123 ## create new state names |
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124 sys.stname = __sysdefstname__ (sys.n, sys.nz); |
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125 endif |
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126 |
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127 endfunction |
