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% STK_MINIMIZE_BOXCONSTRAINED [overload STK function]
%
% CALL: [U_OPT, LIK] = stk_minimize_boxconstrained (ALGO, F, U_INIT, LB, UB)
%
% NOTE
%
% This function simply ignores the bounds, since fminsearch does not handle
% them. This is provided as a last recourse for Matlab users that have
% neither the Optimization toolbox nor MOSEK.
% Copyright Notice
%
% Copyright (C) 2017, 2018 CentraleSupelec
%
% Authors: Julien Bect <julien.bect@centralesupelec.fr>
% Copying Permission Statement
%
% 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 [u_opt, lik] = stk_minimize_boxconstrained (algo, f, u_init, lb, ub)
persistent already_warned
if isempty (already_warned)
w_id = 'STK:stk_optim_fminsearch:stk_minimize_boxconstrained:BoxIgnored';
warning (['STK is going to use fminsearch for a box-constrained ' ...
'optimization problem. There is no guarantee that the solution ' ...
'will be inside the box. You should consider getting a proper ' ...
'box-constrained optimizer.']);
% Even if the persistent gets cleared, don't display the warning again.
% This trick allows us to avoid mlock'ing the file.
warning ('off', w_id);
already_warned = 1;
end
[u_opt, lik] = stk_minimize_unconstrained (algo, f, u_init);
end % function
%#ok<*INUSD> % lb and ub are ignored on purpose
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