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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 sysp = parallel(Asys,Bsys) |
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20 ## Forms the parallel connection of two systems. |
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21 ## |
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22 ## ____________________ |
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23 ## | ________ | |
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24 ## u ----->|----> | Asys |--->|----> y1 |
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25 ## | | -------- | |
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26 ## | | ________ | |
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27 ## |--->|----> | Bsys |--->|----> y2 |
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28 ## | -------- | |
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29 ## -------------------- |
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30 ## Ksys |
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31 |
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32 function sysp = parallel (Asys, Bsys) |
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33 |
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34 ## Written by David Clem August 15, 1994 |
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35 ## completely rewritten Oct 1996 a s hodel |
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36 ## SYS_INTERNAL accesses members of system structure |
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37 |
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38 if(nargin != 2) |
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39 usage("sysp = parallel(Asys,Bsys)"); |
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40 endif |
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41 if(! is_struct(Asys) ) |
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42 error("1st input argument is not a system data structure") |
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43 elseif (! is_struct(Bsys) ) |
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44 error("2nd input argument is not a system data structure") |
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45 endif |
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46 [Ann,Anz,mA] = sysdimensions(Asys); |
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47 [Bnn,Bnz,mB] = sysdimensions(Bsys); |
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48 if(mA != mB) |
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49 error(["Asys has ",num2str(mA)," inputs, Bsys has ",num2str(mB)," inputs"]); |
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50 endif |
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51 |
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52 ## save signal names |
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53 Ain = sysgetsignals(Asys,"in"); |
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54 |
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55 ## change signal names to avoid warning messages from sysgroup |
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56 Asys = syssetsignals(Asys,"in",sysdefioname(length(Ain),"Ain_u")); |
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57 Bsys = syssetsignals(Bsys,"in",sysdefioname(length(Ain),"Bin_u")); |
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58 |
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59 sysp = sysgroup(Asys,Bsys); |
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60 sysD = ss2sys([],[],[],[eye(mA);eye(mA)]); |
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61 |
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62 sysp = sysmult(sysp,sysD); |
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63 sysp = syssetsignals(sysp,"in",Ain); |
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64 |
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65 endfunction |
