1 ## Copyright (C) 2006 Michel D. Schmid <michaelschmid@users.sourceforge.net>
4 ## This program is free software; you can redistribute it and/or modify it
5 ## under the terms of the GNU General Public License as published by
6 ## the Free Software Foundation; either version 2, or (at your option)
9 ## This program is distributed in the hope that it will be useful, but
10 ## WITHOUT ANY WARRANTY; without even the implied warranty of
11 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 ## General Public License for more details.
14 ## You should have received a copy of the GNU General Public License
15 ## along with this program; see the file COPYING. If not, see
16 ## <http://www.gnu.org/licenses/>.
19 ## @deftypefn {Function File} {}[@var{n} = __dtansig (@var{n})
20 ## first derivative of @code{tansig}
24 ## tansig is a symmetric non linear transfer function
25 ## used by neural networks.
26 ## Input n must be calculated with "n = tansig(n)".
31 ## Author: Michel D. Schmid
34 function a = __dtansig(n)