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annotate scripts/control/system/syschtsam.m @ 3500:7923abdeb4e5

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[project @ 2000-01-31 06:35:00 by jwe]
author jwe
date Mon, 31 Jan 2000 06:35:23 +0000
parents 65b3519ac3a1
children 22bd65326ec1
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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 ## -*- 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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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 usage("retsys = syschtsam(sys,tsam)");
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32 elseif (!is_struct(sys))
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33 error("sys must be in system data structure form");
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34 elseif(!is_scalar(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