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annotate scripts/control/system/syschtsam.m @ 5762:0163e7d69161

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[project @ 2006-04-14 15:37:38 by jwe]
author jwe
date Fri, 14 Apr 2006 15:37:38 +0000
parents 4c8a2e4e0717
children 34f96dd5441b
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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, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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18 ## 02110-1301 USA.
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19
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20 ## -*- texinfo -*-
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21 ## @deftypefn {Function File} {} syschtsam (@var{sys}, @var{tsam})
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22 ## This function changes the sampling time (tsam) of the system. Exits with
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23 ## an error if sys is purely continuous time.
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24 ## @end deftypefn
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25
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26 ## Author: John Ingram <ingraje@eng.auburn.edu>
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27 ## Created: August 1996
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29 function retsys = syschtsam (sys, tsam)
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31 if (nargin != 2)
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32 usage ("retsys = syschtsam (sys, tsam)");
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33 elseif (! isstruct (sys))
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34 error ("sys must be in system data structure form");
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35 elseif (! isscalar (tsam))
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36 disp ("syschtsam:")
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37 tsam
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38 error ("tsam must be a scalar")
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39 elseif (! (is_sample (tsam) || tsam <= 0))
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40 error ("tsam must be real, scalar, and greater than zero");
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41 elseif (sysgettsam (sys) == 0)
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42 [nc, nz, mm, pp] = sysdimensions (sys);
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43 warning ("syschtsam: continuous system (nc=%d, nz=%d, mm=%d, pp=%d)",
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44 nc, nz, mm, pp);
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45 warning ("syschtsam: The system is continuous, use c2d to make the system discrete");
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46 endif
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47
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48 retsys = sys;
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49 retsys.tsam = tsam;
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50
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51 endfunction