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diff --git a/octave_packages/nan-2.5.5/cumsumskipnan.m b/octave_packages/nan-2.5.5/cumsumskipnan.m
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+function [x] = cumsumskipnan(x, DIM)
+% CUMSUMSKIPNAN Cumulative sum while skiping NaN's.
+% If DIM is omitted, it defaults to the first non-singleton dimension.
+%
+% Y = cumsumskipnan(x [,DIM])
+%
+% x input data
+% DIM dimension (default: [])
+% y resulting sum
+%
+% see also: CUMSUM, SUMSKIPNAN
+
+
+% 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 .
+
+% $Id$
+% Copyright (C) 2011 by Alois Schloegl
+% This function is part of the NaN-toolbox
+% http://pub.ist.ac.at/~schloegl/matlab/NaN/
+
+
+%%% TODO: implement as mex-function
+
+i = isnan(x);
+x(i) = 0;
+
+if nargin==2,
+ x = cumsum(x,DIM);
+ x(i) = NaN;
+elseif nargin==1,
+ x = cumsum(x);
+ x(i) = NaN;
+else
+ help cumsumskipnan
+end;
+
+
+