/usr/share/octave/packages/3.2/optim-1.0.17/__bracket_min.m is in octave-optim 1.0.17-1.
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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 30 | ## [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
## Author : Etienne Grossmann <etienne@isr.ist.utl.pt>
## Modified by: Levente Torok <TorokLev@gmail.com>
## This software is distributed under the terms of the GPL
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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