/usr/share/octave/packages/signal-1.3.2/polystab.m is in octave-signal 1.3.2-1.
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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 | ## Copyright (C) 2001 Paul Kienzle <pkienzle@users.sf.net>
##
## This program 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.
##
## This program 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
## this program; if not, see <http://www.gnu.org/licenses/>.
## b = polystab(a)
##
## Stabilize the polynomial transfer function by replacing all roots
## outside the unit circle with their reflection inside the unit circle.
function b = polystab(a)
r = roots(a);
v = find(abs(r)>1);
r(v) = 1./conj(r(v));
b = a(1) * poly ( r );
if isreal(a), b = real(b); endif
endfunction
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