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function FLAG = flag_implicit_skip_nan(i)
% FLAG_IMPLICIT_SKIP_NAN sets and gets default mode for handling NaNs
% 1 skips NaN's (the default mode if no mode is set)
% 0 NaNs are propagated; input NaN's give NaN's at the output
%
% FLAG = flag_implicit_skip_nan()
% gets current mode
%
% flag_implicit_skip_nan(FLAG) % sets mode
%
% prevFLAG = flag_implicit_skip_nan(nextFLAG)
% gets previous set FLAG and sets FLAG for the future
% flag_implicit_skip_nan(prevFLAG)
% resets FLAG to previous mode
%
% It is used in:
% SUMSKIPNAN, MEDIAN, QUANTILES, TRIMEAN
% and affects many other functions like:
% CENTER, KURTOSIS, MAD, MEAN, MOMENT, RMS, SEM, SKEWNESS,
% STATISTIC, STD, VAR, ZSCORE etc.
%
% The mode is stored in the global variable FLAG_implicit_skip_nan
% It is recommended to use flag_implicit_skip_nan(1) as default and
% flag_implicit_skip_nan(0) should be used for exceptional cases only.
% This feature might disappear without further notice, so you should really not
% rely on it.
% 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, write to the Free Software
% Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
% $Id: flag_implicit_skip_nan.m 8351 2011-06-24 17:35:07Z carandraug $
% Copyright (C) 2001-2003,2009 by Alois Schloegl <alois.schloegl@gmail.com>
% Copyright (C) 2014-2017 Dynare Team
%
% This function is part of the NaN-toolbox
% http://pub.ist.ac.at/~schloegl/matlab/NaN/
persistent FLAG_implicit_skip_nan;
%% if strcmp(version,'3.6'), FLAG_implicit_skip_nan=(1==1); end; %% hack for the use with Freemat3.6
%%% set DEFAULT value of FLAG
if isempty(FLAG_implicit_skip_nan)
FLAG_implicit_skip_nan = (1==1); %logical(1); % logical.m not available on 2.0.16
end
FLAG = FLAG_implicit_skip_nan;
if nargin>0
FLAG_implicit_skip_nan = (i~=0); %logical(i); %logical.m not available in 2.0.16
if (~i)
warning('flag_implicit_skipnan(0): You are warned!!! You have turned off skipping NaN in sumskipnan. This is not recommended. Make sure you really know what you do.')
end
end
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