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annotate scripts/control/system/syschtsam.m @ 7016:93c65f2a5668

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[project @ 2007-10-12 06:40:56 by jwe]
author jwe
date Fri, 12 Oct 2007 06:41:26 +0000
parents 34f96dd5441b
children a1dbe9d80eee
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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
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7 ## the Free Software Foundation; either version 3 of the License, or (at
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8 ## your option) any later version.
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9 ##
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10 ## Octave is distributed in the hope that it will be useful, but
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 ## General Public License 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, see
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17 ## <http://www.gnu.org/licenses/>.
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18
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {} syschtsam (@var{sys}, @var{tsam})
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21 ## This function changes the sampling time (tsam) of the system. Exits with
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22 ## an error if sys is purely continuous time.
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23 ## @end deftypefn
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24
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25 ## Author: John Ingram <ingraje@eng.auburn.edu>
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26 ## Created: August 1996
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28 function retsys = syschtsam (sys, tsam)
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30 if (nargin != 2)
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31 print_usage ();
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32 elseif (! isstruct (sys))
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33 error ("sys must be in system data structure form");
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34 elseif (! isscalar (tsam))
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35 disp ("syschtsam:")
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36 tsam
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37 error ("tsam must be a scalar")
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38 elseif (! (is_sample (tsam) || tsam <= 0))
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39 error ("tsam must be real, scalar, and greater than zero");
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40 elseif (sysgettsam (sys) == 0)
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41 [nc, nz, mm, pp] = sysdimensions (sys);
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42 warning ("syschtsam: continuous system (nc=%d, nz=%d, mm=%d, pp=%d)",
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43 nc, nz, mm, pp);
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44 warning ("syschtsam: The system is continuous, use c2d to make the system discrete");
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45 endif
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46
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47 retsys = sys;
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48 retsys.tsam = tsam;
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49
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50 endfunction