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## Copyright (C) 1996 John W. Eaton
##
## This file is part of Octave.
##
## Octave 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.
##
## Octave 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 Octave; see the file COPYING. If not, write to the Free
## Software Foundation, 59 Temple Place - Suite 330, Boston, MA
## 02111-1307, USA.
## usage: mean (a)
##
## For vector arguments, return the mean the values.
##
## For matrix arguments, return a row vector containing the mean for
## each column.
##
## See also: median, std
## Author: jwe
function retval = mean (a)
if (nargin != 1)
usage ("mean (a)");
endif
[nr, nc] = size (a);
if (nr == 1 || nc == 1)
retval = sum (a) / length (a);
elseif (nr > 0 && nc > 0)
retval = sum (a) / nr;
else
error ("mean: invalid matrix argument");
endif
endfunction
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