/usr/share/octave/packages/nnet-0.1.13/logsig.m is in octave-nnet 0.1.13-2.
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 | ## Copyright (C) 2007 Michel D. Schmid <michaelschmid@users.sourceforge.net>
##
##
## 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 2, 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; see the file COPYING. If not, see
## <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} {}@var{a} = logsig (@var{n})
## @code{logsig} is a non-linear transfer function used to train
## neural networks.
## This function can be used in newff(...) to create a new feed forward
## multi-layer neural network.
##
## @end deftypefn
## @seealso{purelin,tansig}
## Author: Michel D. Schmid
function a = logsig(n)
a = 1 ./ (1 + exp(-n));
## attention with critical values ==> infinite values
## must be set to 1! Still the same problem as in "tansig"
i = find(!finite(a));
a(i) = sign(n(i));
endfunction
|