X-Git-Url: https://git.creatis.insa-lyon.fr/pubgit/?p=CreaPhase.git;a=blobdiff_plain;f=octave_packages%2Fnnet-0.1.13%2Ftansig.m;fp=octave_packages%2Fnnet-0.1.13%2Ftansig.m;h=3f14d423169229a401c394b85a02a9e4ed83e1d0;hp=0000000000000000000000000000000000000000;hb=f5f7a74bd8a4900f0b797da6783be80e11a68d86;hpb=1705066eceaaea976f010f669ce8e972f3734b05

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+## 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{a} = tansig (@var{n})
+## @code{tansig} 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, logsig}
+
+## Author: Michel D. Schmid
+
+
+function a = tansig(n)
+
+  ## see MATLAB(TM) online help
+  a = 2 ./ (1 + exp(-2*n)) - 1;
+  ## attention with critical values ==> infinite values
+  ## must be set to 1
+  i = find(!finite(a));
+  a(i) = sign(n(i));
+
+endfunction
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