1 ## Copyright (C) 2009, 2010 Lukas F. Reichlin
3 ## This file is part of LTI Syncope.
5 ## LTI Syncope is free software: you can redistribute it and/or modify
6 ## it under the terms of the GNU General Public License as published by
7 ## the Free Software Foundation, either version 3 of the License, or
8 ## (at your option) any later version.
10 ## LTI Syncope is distributed in the hope that it will be useful,
11 ## but WITHOUT ANY WARRANTY; without even the implied warranty of
12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 ## GNU General Public License for more details.
15 ## You should have received a copy of the GNU General Public License
16 ## along with LTI Syncope. If not, see <http://www.gnu.org/licenses/>.
19 ## @deftypefn {Function File} {@var{bool} =} isstable (@var{sys})
20 ## @deftypefnx {Function File} {@var{bool} =} isstable (@var{sys}, @var{tol})
21 ## Determine whether LTI system is stable.
28 ## Optional tolerance for stability. Default value is 0.
34 ## System is not stable.
41 ## real (p) < -tol*(1 + abs (p)) continuous-time
42 ## abs (p) < 1 - tol discrete-time
47 ## Author: Lukas Reichlin <lukas.reichlin@gmail.com>
48 ## Created: October 2009
51 function bool = isstable (sys, tol = 0)
60 bool = __is_stable__ (pol, ct, tol);