|
3430
|
1 ## Copyright (C) 1996 Auburn University. All rights reserved. |
|
|
2 ## |
|
|
3 ## This file is part of Octave. |
|
|
4 ## |
|
|
5 ## Octave is free software; you can redistribute it and/or modify it |
|
|
6 ## under the terms of the GNU General Public License as published by the |
|
|
7 ## Free Software Foundation; either version 2, or (at your option) any |
|
|
8 ## later version. |
|
|
9 ## |
|
|
10 ## Octave is distributed in the hope that it will be useful, but WITHOUT |
|
|
11 ## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
|
|
12 ## FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
|
|
13 ## for more details. |
|
|
14 ## |
|
|
15 ## You should have received a copy of the GNU General Public License |
|
|
16 ## along with Octave; see the file COPYING. If not, write to the Free |
|
5307
|
17 ## Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
|
|
18 ## 02110-1301 USA. |
|
3430
|
19 |
|
|
20 ## -*- texinfo -*- |
|
3502
|
21 ## @deftypefn {Function File} {[@var{csys}, @var{acd}, @var{ccd}] =} syscont (@var{sys}) |
|
3430
|
22 ## Extract the purely continuous subsystem of an input system. |
|
|
23 ## |
|
5016
|
24 ## @strong{Input} |
|
|
25 ## @table @var |
|
|
26 ## @item sys |
|
|
27 ## system data structure. |
|
|
28 ## @end table |
|
3430
|
29 ## |
|
|
30 ## @strong{Outputs} |
|
|
31 ## @table @var |
|
|
32 ## @item csys |
|
|
33 ## is the purely continuous input/output connections of @var{sys} |
|
3502
|
34 ## @item acd |
|
|
35 ## @itemx ccd |
|
3430
|
36 ## connections from discrete states to continuous states, |
|
|
37 ## discrete states to continuous outputs, respectively. |
|
|
38 ## |
|
|
39 ## returns @var{csys} empty if no continuous/continous path exists |
|
|
40 ## @end table |
|
|
41 ## @end deftypefn |
|
|
42 |
|
|
43 ## Author: John Ingram <ingraje@eng.auburn.edu> |
|
|
44 ## Created: August 1996 |
|
|
45 |
|
|
46 function [csys, Acd, Ccd] = syscont (sys) |
|
|
47 |
|
5568
|
48 if (nargin != 1) |
|
6046
|
49 print_usage (); |
|
5568
|
50 elseif (!isstruct(sys)) |
|
|
51 error("sys must be in system data structure form"); |
|
|
52 endif |
|
3430
|
53 |
|
5568
|
54 sys = sysupdate (sys, "ss"); |
|
|
55 [n_tot, st_c, st_d, y_c, y_d] = __syscont_disc__ (sys); # get ranges |
|
3430
|
56 |
|
5568
|
57 ## assume there's nothing there; build partitions as appropriate |
|
|
58 Acc = Acd = Bcc = Ccc = Ccd = Dcc = []; |
|
3430
|
59 |
|
5568
|
60 if(isempty(st_c) & isempty(y_c)) |
|
|
61 error("syscont: expecting continous states and/or continous outputs"); |
|
|
62 elseif (isempty(st_c)) |
|
|
63 warning("syscont: no continuous states"); |
|
|
64 elseif(isempty(y_c)) |
|
|
65 warning("syscont: no continuous outputs"); |
|
|
66 endif |
|
3430
|
67 |
|
5568
|
68 [sys_a, sys_b, sys_c, sys_d ] = sys2ss(sys); |
|
|
69 [sys_stname, sys_inname, sys_outname] = sysgetsignals(sys); |
|
|
70 [sys_n, sys_nz, sys_m, sys_p] = sysdimensions(sys); |
|
|
71 if(!isempty(st_c)) |
|
|
72 Acc = sys_a(st_c,st_c); |
|
|
73 stname = sys_stname(st_c); |
|
|
74 Bcc = sys_b(st_c,:); |
|
|
75 Ccc = sys_c(y_c,st_c); |
|
|
76 Acd = sys_a(st_c,st_d); |
|
|
77 else |
|
|
78 stname=[]; |
|
|
79 endif |
|
|
80 outname = sys_outname(y_c); |
|
|
81 Dcc = sys_d(y_c,:); |
|
|
82 Ccd = sys_c(y_c,st_d); |
|
|
83 inname = sys_inname; |
|
3430
|
84 |
|
5568
|
85 csys = ss(Acc,Bcc,Ccc,Dcc,0,sys_n,0,stname,inname,outname); |
|
3430
|
86 |
|
|
87 endfunction |
