/usr/share/octave/packages/control-2.6.2/@ss/__minreal__.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 38 39 40 41 42 43 44 45 | ## 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 -*-
## Minimal realization of SS models. The physical meaning of states is lost.
## Uses SLICOT TB01PD and TG01JD by courtesy of
## @uref{http://www.slicot.org, NICONET e.V.}
## Author: Lukas Reichlin <lukas.reichlin@gmail.com>
## Created: October 2009
## Version: 0.3
function retsys = __minreal__ (sys, tol)
if (tol == "def")
tol = 0;
elseif (tol > 1)
error ("ss: minreal: require tol <= 1");
endif
if (isempty (sys.e))
[a, b, c] = __sl_tb01pd__ (sys.a, sys.b, sys.c, tol, sys.scaled);
retsys = ss (a, b, c, sys.d);
else
[a, e, b, c] = __sl_tg01jd__ (sys.a, sys.e, sys.b, sys.c, tol, sys.scaled, 0, 0);
retsys = dss (a, b, c, sys.d, e);
endif
retsys.lti = sys.lti; # retain i/o names and tsam
endfunction
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