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% STK_TESTFUN_TWOBUMPS computes the TwoBumps response function
%
% CALL: Z = stk_testfun_twobumps (X)
%
% computes the response Z of the TwoBumps function at X.
%
% The TwoBumps function is defined as:
%
% TwoBumps(x) = - (0.7x + sin(5x + 1) + 0.1 sin(10x))
%
% for x in [-1.0; 1.0].
% Authors
%
% Julien Bect <julien.bect@centralesupelec.fr>
% Emmanuel Vazquez <emmanuel.vazquez@centralesupelec.fr>
% Copying Permission Statement (this file)
%
% To the extent possible under law, CentraleSupelec has waived all
% copyright and related or neighboring rights to
% stk_testfun_twobumps.m. This work is published from France.
%
% License: CC0 <http://creativecommons.org/publicdomain/zero/1.0/>
% Copying Permission Statement (STK toolbox as a whole)
%
% This file is part of
%
% STK: a Small (Matlab/Octave) Toolbox for Kriging
% (https://github.com/stk-kriging/stk/)
%
% 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 z = stk_testfun_twobumps (x)
x = double (x);
z = -(0.7 * x + (sin (5 * x + 1)) + 0.1 * (sin (10 * x)));
end % function
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