--- /dev/null
+function [o] = nansum(i,DIM)
+% NANSUM same as SUM but ignores NaN's.
+% NANSUM is OBSOLETE; use SUMSKIPNAN instead. NANSUM is included
+% to fix a bug in some other versions.
+%
+% Y = nansum(x [,DIM])
+%
+% DIM dimension
+% 1 sum of columns
+% 2 sum of rows
+% default or []: first DIMENSION with more than 1 element
+% Y resulting sum
+%
+%
+% see also: SUM, SUMSKIPNAN, NANSUM
+
+% $Id: nansum.m 9033 2011-11-08 20:58:07Z schloegl $
+% Copyright (C) 2000-2003,2008 by Alois Schloegl <alois.schloegl@gmail.com>
+% This is part of the NaN-toolbox. For more details see
+% http://pub.ist.ac.at/~schloegl/matlab/NaN/
+%
+% 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/>.
+
+
+if nargin>1
+ o = sumskipnan(i,DIM);
+else
+ o = sumskipnan(i);
+end;
+
+%!assert(nansum(NaN),0)
+