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% UMINUS [overload base function]
% Copyright Notice
%
% Copyright (C) 2015 CentraleSupelec
%
% Author: Julien Bect <julien.bect@supelec.fr>
% Copying Permission Statement
%
% This file is part of
%
% STK: a Small (Matlab/Octave) Toolbox for Kriging
% (http://sourceforge.net/projects/kriging)
%
% STK 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.
%
% STK 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 STK. If not, see <http://www.gnu.org/licenses/>.
function x = uminus (x)
x.stk_dataframe = - x.stk_dataframe;
x.levels = cellfun (@uminus, x.levels, 'UniformOutput', false);
end % function uminus
%!test
%! x = stk_factorialdesign ({1:3, 1:2});
%! y = stk_factorialdesign ({-(1:3), -(1:2)});
%! assert (isequal (-x, y))
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