Mercurial > octave
view scripts/control/is_detectable.m @ 3346:8dd4718801fd
[project @ 1999-11-09 18:18:12 by jwe]
author | jwe |
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date | Tue, 09 Nov 1999 18:18:37 +0000 |
parents | f7e4a95916f2 |
children | 69b167451491 |
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# Copyright (C) 1993, 1994, 1995 Auburn University. All Rights Reserved # # This file is part of Octave. # # Octave is free software; you can redistribute it and/or modify it # under the terms of the GNU General Public License as published by the # Free Software Foundation; either version 2, or (at your option) any # later version. # # Octave is distributed in the hope that it will be useful, but WITHOUT # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License # for more details. # # You should have received a copy of the GNU General Public License # along with Octave; see the file COPYING. If not, write to the Free # Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. ## -*- texinfo -*- ## @deftypefn {Function File } { [@var{retval}, @var{U}] =} is_detectable (@var{a}, @var{c}@{, @var{tol}@}) ## @deftypefnx {Function File } { [@var{retval}, @var{U}] =} is_detectable (@var{sys}@{, @var{tol}@}) ## Test for detactability (observability of unstable modes) of (@var{a},@var{c}). ## ## Returns 1 if the system @var{a} or the pair (@var{a},@var{c})is ## detectable, 0 if not. ## ## @strong{See} @code{is_stabilizable} for detailed description of arguments and ## computational method. ## ## Default: tol = 10*norm(a,'fro')*eps ## ## @end deftypefn ## See also: size, rows, columns, length, is_matrix, is_scalar, is_vector. function [retval,U] = is_detectable (a,c,tol) # Written by A. S. Hodel (scotte@eng.auburn.edu) August 1993. # Updated by John Ingram (ingraje@eng.auburn.edu) July 1996. if( nargin < 1) usage("[retval,U] = is_detectable(a , c {, tol})"); elseif(is_struct(a)) # system form if(nargin == 2) tol = c; elseif(nargin > 2) usage("[retval,U] = is_detectable(sys {, tol})"); endif [a,b,c] = sys2ss(a); elseif(nargin > 3) usage("[retval,U] = is_detectable(a , c {, tol})"); endif if(exist("tol")) [retval,U] = is_stabilizable (a', c', tol); else [retval,U] = is_stabilizable (a', c'); endif endfunction