/usr/share/octave/packages/control-2.6.2/@tf/__sys_group__.m is in octave-control 2.6.2-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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##
## 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 -*-
## Block diagonal concatenation of two TF models.
## This file is part of the Model Abstraction Layer.
## For internal use only.
## Author: Lukas Reichlin <lukas.reichlin@gmail.com>
## Created: September 2009
## Version: 0.2
function retsys = __sys_group__ (sys1, sys2)
if (! isa (sys1, "tf"))
sys1 = tf (sys1);
endif
if (! isa (sys2, "tf"))
sys2 = tf (sys2);
endif
retsys = tf ();
retsys.lti = __lti_group__ (sys1.lti, sys2.lti);
[p1, m1] = size (sys1);
[p2, m2] = size (sys2);
empty12 = tfpolyzeros (p1, m2);
empty21 = tfpolyzeros (p2, m1);
retsys.num = [sys1.num, empty12 ;
empty21, sys2.num];
empty12 = tfpolyones (p1, m2);
empty21 = tfpolyones (p2, m1);
retsys.den = [sys1.den, empty12 ;
empty21, sys2.den];
if (sys1.tfvar == sys2.tfvar)
retsys.tfvar = sys1.tfvar;
elseif (sys1.tfvar == "x")
retsys.tfvar = sys2.tfvar;
else
retsys.tfvar = sys1.tfvar;
endif
if (sys1.inv || sys2.inv)
retsys.inv = true;
endif
endfunction
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