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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:  stdnormal_cdf (x)
+##
+## For each component of x, compute the CDF of the standard normal
+## distribution at x.
+
+## Author:  KH <Kurt.Hornik@ci.tuwien.ac.at>
+## Description:  CDF of the standard normal distribution
+
+function cdf = stdnormal_cdf (x)
+  
+  if (nargin != 1)
+    usage ("stdnormal_cdf (x)");
+  endif
+
+  [r_x, c_x] = size (x);
+  if (r_x * c_x == 0)
+    error ("stdnormal_cdf:  x must not be empty.");
+  endif
+
+  cdf = ( ones (r_x, c_x) + erf (x / sqrt(2)) ) / 2; 
+  
+endfunction
+  
+
+
+