/usr/share/octave/packages/control-2.6.2/__is_stable__.m is in octave-control 2.6.2-1build1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 | ## Copyright (C) 2009-2014 Lukas F. Reichlin
##
## This file is part of LTI Syncope.
##
## LTI Syncope 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 3 of the License, or
## (at your option) any later version.
##
## LTI Syncope 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 LTI Syncope. If not, see <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## Determine whether all poles in a vector are stable.
## Author: Lukas Reichlin <lukas.reichlin@gmail.com>
## Created: December 2010
## Version: 0.2
function bool = __is_stable__ (pol, ct = true, tol = 0)
if (! is_real_scalar (tol) || tol < 0)
error ("isstable: tolerance must be a real-valued, non-negative scalar");
endif
if (ct) # continuous-time
bool = all (real (pol) < -tol*(1 + abs (pol)));
else # discrete-time
bool = all (abs (pol) < 1 - tol);
endif
endfunction
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