1 ## Copyright (C) 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 ## Determine whether all poles in a vector are stable.
21 ## Author: Lukas Reichlin <lukas.reichlin@gmail.com>
22 ## Created: December 2010
25 function bool = __is_stable__ (pol, ct = true, tol = 0)
27 if (ct) # continuous-time
28 bool = all (real (pol) < -tol*(1 + abs (pol)));
30 bool = all (abs (pol) < 1 - tol);