1## Copyright (C) 2000 Kai Habel <kai.habel@gmx.de> 2## 3## This program is free software; you can redistribute it and/or modify it under 4## the terms of the GNU General Public License as published by the Free Software 5## Foundation; either version 3 of the License, or (at your option) any later 6## version. 7## 8## This program is distributed in the hope that it will be useful, but WITHOUT 9## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10## FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more 11## details. 12## 13## You should have received a copy of the GNU General Public License along with 14## this program; if not, see <http://www.gnu.org/licenses/>. 15 16## -*- texinfo -*- 17## @deftypefn {Function File} @var{s}= std2 (@var{I}) 18## Returns the standard deviation for a 2d real type matrix. 19## Uses @code{std (I(:))} 20## @seealso{mean2,std} 21## @end deftypefn 22 23function s = std2 (I) 24 25 if !(nargin == 1) 26 print_usage (); 27 endif 28 29 if (! isreal (I)) 30 error("std2: I be a real type array"); 31 endif 32 33 s = std (I(:)); 34endfunction 35