--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/scripts/statistics/base/mean.m	Thu Oct 29 05:23:09 1998 +0000
@@ -0,0 +1,71 @@
+## 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:  mean (x [, opt])
+##
+## For vector arguments, return the mean the values.
+## For matrix arguments, return a row vector containing the mean for
+## each column.
+##
+## With the optional argument opt, the kind of mean computed can be
+## selected.
+## If opt is "a", the (ordinary) arithmetic mean is computed.  This
+## is the default.
+## If opt is "g", the geometric mean is computed.
+## If opt is "h", the harmonic mean is computed.
+  
+## Author:  KH <Kurt.Hornik@ci.tuwien.ac.at>
+## Description:  Compute arithmetic, geometric, and harmonic mean
+
+function y = mean (x, opt)
+
+  if ((nargin < 1) || (nargin > 2))
+    usage ("mean (x [, opt])");
+  endif
+
+  if isempty (x)
+    error ("mean:  x must not be empty");
+  endif
+  
+  if (rows (x) == 1)
+    x = x';
+  endif
+  
+  if (nargin == 1)
+    opt = "a";
+  endif
+
+  [r, c] = size (x);
+  
+  if (strcmp (opt, "a"))
+    y = sum (x) / r;
+  elseif (strcmp (opt, "g"))
+    y = NaN * ones (1, c);
+    i = find (all (x > 0));
+    if any (i)
+      y(i) = exp (sum (log (x(:, i))) / r);
+    endif
+  elseif (strcmp (opt, "h"))
+    y = NaN * ones (1, c);
+    i = find (all (x != 0));
+    if any (i)
+      y(i) = r ./ sum (1 ./ x(:, i));
+    endif
+  else
+    error (sprintf ("mean:  option `%s' not recognized", opt));
+  endif
+    
+endfunction