/usr/share/octave/packages/nnet-0.1.13/__dtansig.m is in octave-nnet 0.1.13-2.
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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 31 32 33 34 35 36 37 38 | ## Copyright (C) 2006 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{n} = __dtansig (@var{n})
## first derivative of @code{tansig}
##
## @example
##
## tansig is a symmetric non linear transfer function
## used by neural networks.
## Input n must be calculated with "n = tansig(n)".
## @end example
##
## @end deftypefn
## Author: Michel D. Schmid
function a = __dtansig(n)
a = 1-(n.*n);
endfunction
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