/usr/share/octave/packages/control-2.6.2/@ss/__sys_prune__.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 -*-
## Submodel extraction and reordering for SS objects.
## This file is part of the Model Abstraction Layer.
## For internal use only.
## Author: Lukas Reichlin <lukas.reichlin@gmail.com>
## Created: September 2009
## Version: 0.3
function sys = __sys_prune__ (sys, out_idx, in_idx, st_idx = ":")
[sys.lti, out_idx, in_idx] = __lti_prune__ (sys.lti, out_idx, in_idx);
if (ischar (st_idx) && ! strcmp (st_idx, ":"))
st_idx = {st_idx};
endif
if (iscell (st_idx))
st_idx = cellfun (@(x) __str2idx__ (sys.stname, x), st_idx);
endif
sys.a = sys.a(st_idx, st_idx);
sys.b = sys.b(st_idx, in_idx);
sys.c = sys.c(out_idx, st_idx);
sys.d = sys.d(out_idx, in_idx);
if (! isempty (sys.e))
sys.e = sys.e(st_idx, st_idx);
endif
sys.stname = sys.stname(st_idx);
endfunction
function idx = __str2idx__ (name, str)
tmp = strcmp (name, str)(:);
switch (nnz (tmp))
case 1
idx = find (tmp);
case 0
error ("ss: state name '%s' not found", str);
otherwise
error ("ss: state name '%s' is ambiguous", str);
endswitch
endfunction
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