%
% -------------------------------------------------------------------------
% This file is part of BayesOpt, an efficient C++ library for
% Bayesian optimization.
%
% Copyright (C) 2011-2013 Ruben Martinez-Cantin
%
% BayesOpt 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.
%
% BayesOpt 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 BayesOpt. If not, see .
% ------------------------------------------------------------------------
%
function x_out = langermann(x_in)
% Bounds [3,5]
a = [3,5,2,1,7];
b = [5,2,1,4,9];
c = [1,2,5,2,3];
x = x_in(1);
y = x_in(2);
t1 = exp(-(x-a).^2/pi -(y-b).^2/pi);
t2 = cos(pi*(x-a).^2 + pi*(y-b).^2);
x_out = sum(c.*t1.*t2);