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% STK_MINIMIZE_UNCONSTRAINED performs unconstrained minimisation using fminsearch.
%
% CALL: U_OPT = stk_minimize_unconstrained (ALGO, F, U_INIT)
%
% estimates the parameters U_OPT without any bounds, which gives the minimum
% value of the function F. A starting point U_INIT must be provided.
%
% CALL: [U_OPT, LIK] = stk_minimize_unconstrained (ALGO, F, U_INIT)
%
% also estimates the minimum function value LIK after the unconstrained
% minimisation using fminsearch.
%
% NOTE: Here ALGO is an input argument to the function, that is an object of
% class 'stk_optim_fminsearch'.
% Copyright Notice
%
% Copyright (C) 2018 CentraleSupelec
% Copyright (C) 2014 SUPELEC & A. Ravisankar
%
% Authors: Julien Bect <julien.bect@supelec.fr>
% Ashwin Ravisankar <ashwinr1993@gmail.com>
% 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 [u_opt,lik] = stk_minimize_unconstrained (algo, f, u_init)
[u_opt,lik] = fminsearch (f, u_init, algo.options);
end % function
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