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annotate scripts/control/system/is_siso.m @ 7017:a1dbe9d80eee

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[project @ 2007-10-12 21:27:11 by jwe]
author jwe
date Fri, 12 Oct 2007 21:27:37 +0000
parents 93c65f2a5668
children
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1 ## Copyright (C) 1996, 2000, 2002, 2003, 2004, 2005, 2006, 2007
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2 ## Auburn University. All rights reserved.
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3 ##
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4 ## This file is part of Octave.
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5 ##
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6 ## Octave is free software; you can redistribute it and/or modify it
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7 ## under the terms of the GNU General Public License as published by
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8 ## the Free Software Foundation; either version 3 of the License, or (at
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9 ## your option) any later version.
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10 ##
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11 ## Octave is distributed in the hope that it will be useful, but
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12 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 ## General Public License for more details.
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15 ##
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16 ## You should have received a copy of the GNU General Public License
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17 ## along with Octave; see the file COPYING. If not, see
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18 ## <http://www.gnu.org/licenses/>.
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19
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20 ## -*- texinfo -*-
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21 ## @deftypefn {Function File} {} is_siso (@var{sys})
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22 ## Returns nonzero if the system data structure
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23 ## @var{sys} is single-input, single-output.
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24 ## @end deftypefn
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25
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26 ## Author: A. S. Hodel <a.s.hodel@eng.auburn.edu>
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27 ## Created: July 1996, 1998
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28
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29 function SISO = is_siso (sys)
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30
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31 if (nargin != 1)
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32 print_usage ();
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33 elseif (! isstruct (sys))
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34 error ("input must be a system structure (see ss, tf, zp)");
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35 endif
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36
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37 [n, nz, m, p] = sysdimensions (sys);
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38
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39 SISO = (m == 1 && p == 1);
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40
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41 endfunction