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+## Copyright (C) 1995, 1996, 1997  Kurt Hornik
+## 
+## 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 file.  If not, write to the Free Software Foundation,
+## 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+## usage:  logistic_pdf (x)
+##
+## For each component of x, compute the PDF at x of the logistic
+## distribution.
+
+## Author:  KH <Kurt.Hornik@ci.tuwien.ac.at>
+## Description:  PDF of the logistic distribution
+
+function pdf = logistic_pdf (x)
+  
+  if (nargin != 1)
+    usage ("logistic_pdf (x)");
+  endif
+
+  cdf = logistic_cdf (x);
+  pdf = cdf .* (1 - cdf);
+  
+endfunction