Mercurial > hg > octave-nkf

annotate scripts/control/system/syschtsam.m @ 5249:5c2f58301790 ss-2-9-1

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
[project @ 2005-03-27 12:06:59 by jwe]
author jwe
date Sun, 27 Mar 2005 12:06:59 +0000
parents 3e48e60a1f8b
children 4c8a2e4e0717
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
3430
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
1 ## Copyright (C) 1996 Auburn University. All rights reserved.
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
2 ##
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
3 ## This file is part of Octave.
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
4 ##
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
5 ## Octave is free software; you can redistribute it and/or modify it
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
6 ## under the terms of the GNU General Public License as published by the
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
7 ## Free Software Foundation; either version 2, or (at your option) any
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
8 ## later version.
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
9 ##
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
10 ## Octave is distributed in the hope that it will be useful, but WITHOUT
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
11 ## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
12 ## FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
13 ## for more details.
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
14 ##
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
15 ## You should have received a copy of the GNU General Public License
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
16 ## along with Octave; see the file COPYING. If not, write to the Free
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
17 ## Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA.
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
18
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
19 ## -*- texinfo -*-
3500
7923abdeb4e5 [project @ 2000-01-31 06:35:00 by jwe]
jwe
parents: 3430
diff changeset
20 ## @deftypefn {Function File} {} syschtsam (@var{sys}, @var{tsam})
3430
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
21 ## This function changes the sampling time (tsam) of the system. Exits with
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
22 ## an error if sys is purely continuous time.
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
23 ## @end deftypefn
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
24
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
25 ## Author: John Ingram <ingraje@eng.auburn.edu>
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
26 ## Created: August 1996
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
27
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
28 function retsys = syschtsam (sys, tsam)
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
29
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
30 if (nargin != 2)
4462
3e48e60a1f8b [project @ 2003-07-12 03:31:41 by jwe]
jwe
parents: 4030
diff changeset
31 usage ("retsys = syschtsam (sys, tsam)");
3e48e60a1f8b [project @ 2003-07-12 03:31:41 by jwe]
jwe
parents: 4030
diff changeset
32 elseif (! isstruct (sys))
3e48e60a1f8b [project @ 2003-07-12 03:31:41 by jwe]
jwe
parents: 4030
diff changeset
33 error ("sys must be in system data structure form");
3e48e60a1f8b [project @ 2003-07-12 03:31:41 by jwe]
jwe
parents: 4030
diff changeset
34 elseif (! isscalar (tsam))
3e48e60a1f8b [project @ 2003-07-12 03:31:41 by jwe]
jwe
parents: 4030
diff changeset
35 disp ("syschtsam:")
3430
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
36 tsam
4462
3e48e60a1f8b [project @ 2003-07-12 03:31:41 by jwe]
jwe
parents: 4030
diff changeset
37 error ("tsam must be a scalar")
3e48e60a1f8b [project @ 2003-07-12 03:31:41 by jwe]
jwe
parents: 4030
diff changeset
38 elseif (! (is_sample (tsam) || tsam <= 0))
3e48e60a1f8b [project @ 2003-07-12 03:31:41 by jwe]
jwe
parents: 4030
diff changeset
39 error ("tsam must be real, scalar, and greater than zero");
3e48e60a1f8b [project @ 2003-07-12 03:31:41 by jwe]
jwe
parents: 4030
diff changeset
40 elseif (sysgettsam (sys) == 0)
3e48e60a1f8b [project @ 2003-07-12 03:31:41 by jwe]
jwe
parents: 4030
diff changeset
41 [nc, nz, mm, pp] = sysdimensions (sys);
3e48e60a1f8b [project @ 2003-07-12 03:31:41 by jwe]
jwe
parents: 4030
diff changeset
42 warning ("syschtsam: continuous system (nc=%d, nz=%d, mm=%d, pp=%d)",
3e48e60a1f8b [project @ 2003-07-12 03:31:41 by jwe]
jwe
parents: 4030
diff changeset
43 nc, nz, mm, pp);
3e48e60a1f8b [project @ 2003-07-12 03:31:41 by jwe]
jwe
parents: 4030
diff changeset
44 warning ("syschtsam: The system is continuous, use c2d to make the system discrete");
3430
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
45 endif
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
46
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
47 retsys = sys;
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
48 retsys.tsam = tsam;
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
49
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
50 endfunction