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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 59dcf01bb3e3
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1 ## Copyright (C) 1993, 1994, 1995, 2000, 2002, 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} {[@var{retval}, @var{u}] =} is_observable (@var{a}, @var{c}, @var{tol})
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22 ## @deftypefnx {Function File} {[@var{retval}, @var{u}] =} is_observable (@var{sys}, @var{tol})
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23 ## Logical check for system observability.
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24 ##
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25 ## Default: tol = @code{tol = 10*norm(a,'fro')*eps}
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26 ##
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27 ## Returns 1 if the system @var{sys} or the pair (@var{a}, @var{c}) is
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28 ## observable, 0 if not.
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29 ##
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30 ## See @command{is_controllable} for detailed description of arguments
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31 ## and default values.
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32 ## @seealso{size, rows, columns, length, ismatrix, isscalar, isvector}
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33 ## @end deftypefn
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34
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35 ## Author: A. S. Hodel <a.s.hodel@eng.auburn.edu>
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36 ## Created: August 1993
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37 ## Updated by John Ingram (ingraje@eng.auburn.edu) July 1996.
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38
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39 function [retval, U] = is_observable (a, c, tol)
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40
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41 if( nargin < 1)
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42 print_usage ();
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43 elseif(isstruct(a))
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44 ## system form
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45 if(nargin == 2)
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46 tol = c;
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47 elseif(nargin > 2)
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48 print_usage ();
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49 endif
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50 [a,b,c] = sys2ss(a);
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51 elseif(nargin > 3)
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52 print_usage ();
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53 endif
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54 if(exist("tol"))
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55 [retval,U] = is_controllable (a', c', tol);
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56 else
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57 [retval,U] = is_controllable (a', c');
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58 endif
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59
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60 endfunction
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