/usr/share/octave/packages/optim-1.3.0/private/__bracket_min.m is in octave-optim 1.3.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 | ## Copyright (C) 2002 Etienne Grossmann <etienne@egdn.net>
## Copyright (C) 2009 Levente Torok <TorokLev@gmail.com>
##
## 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/>.
## [a, b, ga, gb, nev] = semi_bracket (f, dx, a, narg, args)
##
## Find an interval containing a local minimum of the function
## g : h in reals ---> f (x+h*dx) where x = args{narg}
##
## a < b.
## nev is the number of function evaluations
function [a, b, ga, gb, n] = __bracket_min (f, dx, narg, args)
[a,b, ga,gb, n] = __semi_bracket (f, dx, 0, narg, args);
if a != 0, return; end
[a2,b2, ga2,gb2, n2] = __semi_bracket (f, -dx, 0, narg, args);
n += n2;
if a2 == 0,
a = -b2; ga = gb2;
else
a = -b2;
b = -a2;
ga = gb2;
gb = ga2;
end
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