--- /dev/null
+## Copyright (C) 2001 Paul Kienzle <pkienzle@users.sf.net>
+##
+## 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 3 of the License, 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 program; if not, see <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {@var{v} =} nansum (@var{X})
+## @deftypefnx{Function File} {@var{v} =} nansum (@var{X}, @var{dim})
+## Compute the sum while ignoring NaN values.
+##
+## @code{nansum} is identical to the @code{sum} function except that NaN values are
+## treated as 0 and so ignored. If all values are NaN, the sum is
+## returned as 0.
+##
+## @seealso{sum, nanmin, nanmax, nanmean, nanmedian}
+## @end deftypefn
+
+function v = nansum (X, varargin)
+ if nargin < 1
+ print_usage;
+ else
+ X(isnan(X)) = 0;
+ v = sum (X, varargin{:});
+ endif
+endfunction