fderive

 FUNCTION f() implements the first derivative of tanh function.

 INPUT:
 x: input signal

 OUTPUT:
 y: output signal


 Complex Valued Nonlinear Adaptive Filtering toolbox for MATLAB
 Supplementary to the book:
 
 "Complex Valued Nonlinear Adaptive Filters: Noncircularity, Widely Linear and Neural Models"
 by Danilo P. Mandic and Vanessa Su Lee Goh
 
 (c) Copyright Danilo P. Mandic 2009
 http://www.commsp.ee.ic.ac.uk/~mandic
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    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 of the License, 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 can obtain a copy of the GNU General Public License from
    http://www.gnu.org/copyleft/gpl.html or by writing to
    Free Software Foundation, Inc.,675 Mass Ave, Cambridge, MA 02139, USA.
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


 ...........................................

0001 % FUNCTION f() implements the first derivative of tanh function.
0002 %
0003 % INPUT:
0004 % x: input signal
0005 %
0006 % OUTPUT:
0007 % y: output signal
0008 %
0009 %
0010 % Complex Valued Nonlinear Adaptive Filtering toolbox for MATLAB
0011 % Supplementary to the book:
0012 %
0013 % "Complex Valued Nonlinear Adaptive Filters: Noncircularity, Widely Linear and Neural Models"
0014 % by Danilo P. Mandic and Vanessa Su Lee Goh
0015 %
0016 % (c) Copyright Danilo P. Mandic 2009
0017 % http://www.commsp.ee.ic.ac.uk/~mandic
0018 %
0019 % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
0020 %    This program is free software; you can redistribute it and/or modify
0021 %    it under the terms of the GNU General Public License as published by
0022 %    the Free Software Foundation; either version 2 of the License, or
0023 %    (at your option) any later version.
0024 %
0025 %    This program is distributed in the hope that it will be useful,
0026 %    but WITHOUT ANY WARRANTY; without even the implied warranty of
0027 %    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
0028 %    GNU General Public License for more details.
0029 %
0030 %    You can obtain a copy of the GNU General Public License from
0031 %    http://www.gnu.org/copyleft/gpl.html or by writing to
0032 %    Free Software Foundation, Inc.,675 Mass Ave, Cambridge, MA 02139, USA.
0033 % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
0034 %
0035 %
0036 % ...........................................
0037 function y = fderive(x)
0038 y = 1 - (tanh(x).^2);