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1 # Copyright (C) 1996 A. Scottedward Hodel |
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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, 675 Mass Ave, Cambridge, MA 02139, USA. |
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18 |
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19 function sys = sysupdate(sys,opt) |
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20 # function retsys = sysupdate(sys,opt) |
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21 # Update the internal representation of a system. |
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22 # inputs: |
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23 # sys: system data structure |
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24 # opt: string: "tf" -> update transfer function |
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25 # "zp" -> update zero-pole form |
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26 # "ss" -> update state space form |
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27 # "all" -> all of the above |
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28 # outputs: retsys: contains union of data in sys and requested data. |
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29 # if requested data in sys is already up to date then retsys=sys. |
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30 # |
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31 # conversion to tf or zp exits with an error if the system is |
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32 # mixed continuous/digital |
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33 # |
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34 # see also: tf2sys, ss2sys, zp2sys, sysout, sys2ss, sys2tf, sys2zp |
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35 |
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36 # Written by John Ingram 7-9-96 |
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37 # $Revision: 1.1.1.1 $ |
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38 |
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39 # check for correct number of inputs |
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40 if (nargin != 2) |
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41 usage("newsys = sysupdate(sys,opt)"); |
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42 elseif(! is_struct(sys) ) |
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43 error("1st argument must be system data structure") |
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44 elseif(! (strcmp(opt,"tf") + strcmp(opt,"zp") + ... |
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45 strcmp(opt,"ss") + strcmp(opt,"all")) ) |
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46 error("2nd argument must be \"tf\", \"zp\", \"ss\", or \"all\""); |
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47 endif |
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48 |
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49 # check to make sure not trying to make a SISO system out of a MIMO sys |
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50 if ( (strcmp(opt,"tf") + strcmp(opt,"zp") + strcmp(opt,"all")) ... |
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51 & (sys.sys(1) == 2) & (! is_siso(sys) ) ) |
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52 error("MIMO -> SISO update requested"); |
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53 endif |
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54 |
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55 # update transfer function if desired |
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56 if ( (strcmp(opt, "tf") + strcmp(opt,"all"))&& (!sys.sys(2))) |
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57 # check to make sure the system is not discrete and continuous |
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58 is_digital(sys); |
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59 |
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60 # if original system zero-pole |
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61 if (sys.sys(1) == 1) |
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62 [sys.num,sys.den] = zp2tf(sys.zer,sys.pol,sys.k); |
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63 sys.sys(2) = 1; |
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64 # if original system is state-space |
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65 elseif(sys.sys(1) == 2) |
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66 [sys.num,sys.den] = ss2tf(sys.a,sys.b,sys.c,sys.d); |
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67 sys.sys(2) = 1; |
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68 endif |
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69 endif |
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70 |
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71 |
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72 # update zero-pole if desired |
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73 if ( (strcmp(opt, "zp") + strcmp(opt,"all")) && (! sys.sys(3)) ) |
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74 # check to make sure the system is not discrete and continuous |
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75 is_digital(sys); |
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76 |
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77 # original system is transfer function |
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78 if (sys.sys(1) == 0) |
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79 [sys.zer,sys.pol,sys.k] = tf2zp(sys.num,sys.den); |
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80 sys.sys(3) = 1; |
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81 # original system is state-space |
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82 |
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83 elseif(sys.sys(1) == 2) |
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84 [sys.zer,sys.pol,sys.k] = ss2zp(sys.a,sys.b,sys.c,sys.d); |
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85 sys.sys(3) = 1; |
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86 endif |
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87 |
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88 endif |
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89 |
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90 # update state-space if desired |
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91 if ( (strcmp(opt, "ss") + strcmp(opt,"all")) && (! sys.sys(4)) ) |
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92 # original system is transfer function |
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93 if (sys.sys(1) == 0) |
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94 [sys.a,sys.b,sys.c,sys.d] = tf2ss(sys.num,sys.den); |
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95 sys.sys(4) = 1; |
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96 # original system is zero-pole |
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97 elseif(sys.sys(1) == 1) |
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98 [sys.a,sys.b,sys.c,sys.d] = zp2ss(sys.zer,sys.pol,sys.k); |
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99 sys.sys(4) = 1; |
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100 endif |
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101 |
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102 # create new state names |
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103 sys.stname = sysdefstname(sys.n, sys.nz); |
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104 endif |
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105 |
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106 |
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107 endfunction |
