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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, 59 Temple Place, Suite 330, Boston, MA 02111 USA. |
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18 |
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19 function [a,b,c,d] = series(a1,b1,c1,d1,a2,b2,c2,d2) |
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20 ## Forms the series connection of two systems. |
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21 ## |
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22 ## Superseded by sysmult. Do not use this routine! |
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23 ## used internally in zp2ss |
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24 ## |
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25 ## Type of input: Transfer functions |
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26 ## Command: [num,den]=series(num1,den1,num2,den2) |
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27 ## Forms the series representation of the two transfer functions. |
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28 ## |
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29 ## Type of input: State space systems |
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30 ## Command: [a,b,c,d]=series(a1,b1,c1,d1,a2,b2,c2,d2) |
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31 ## Forms the series representation of the two state space system arguments. |
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32 ## The series connected system will have the inputs of system 1 and the |
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33 ## outputs of system 2. |
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34 ## |
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35 ## Type of input: system data structure |
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36 ## Command: syst=series(syst1,syst2) |
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37 ## Forms the series representation of the two mu system arguments. |
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38 ## Written by David Clem August 15, 1994 |
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39 |
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40 ## If two arguments input, take care of mu system case |
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41 |
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42 warning("series is superseded by sysmult; use sysmult instead.") |
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43 |
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44 muflag = 0; |
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45 if(nargin == 2) |
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46 temp=b1; |
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47 [a1,b1,c1,d1]=sys2ss(a1); |
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48 [a2,b2,c2,d2]=sys2ss(temp); |
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49 muflag = 1; |
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50 endif |
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51 |
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52 ## If four arguments input, put two transfer functions in series |
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53 |
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54 if(nargin == 4) |
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55 a = conv(a1,c1); % was conv1 |
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56 b = conv(b1,d1); % was conv1 |
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57 c = 0; |
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58 d = 0; |
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59 |
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60 ## Find series combination of 2 state space systems |
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61 |
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62 elseif((nargin == 8)||(muflag == 1)) |
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63 |
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64 ## check matrix dimensions |
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65 |
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66 [n1,m1,p1] = abcddim(a1,b1,c1,d1); |
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67 [n2,m2,p2] = abcddim(a2,b2,c2,d2); |
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68 |
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69 if((n1 == -1) || (n2 == -1)) |
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70 error("Incorrect matrix dimensions"); |
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71 endif |
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72 |
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73 ## check to make sure the number of outputs of system1 equals the number |
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74 ## of inputs of system2 |
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75 |
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76 if(p1 ~= m2) |
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77 error("System 1 output / System 2 input connection sizes do not match"); |
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78 endif |
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79 |
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80 ## put the two state space systems in series |
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81 |
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82 a = [a1, zeros(rows(a1),columns(a2));b2*c1, a2]; |
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83 b = [b1;b2*d1]; |
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84 c = [d2*c1, c2]; |
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85 d = [d2*d1]; |
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86 |
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87 ## take care of mu output |
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88 |
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89 if(muflag == 1) |
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90 a=ss2sys(a,b,c,d); |
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91 b=c=d=0; |
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92 endif |
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93 endif |
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94 |
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95 endfunction |
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96 |
