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% LINSOLVE [STK internal]
%
% CALL: w = linsolve (kreq, rs)
%
% Overload base function 'linsolve' for stk_kreq_qr objects.
% Copyright Notice
%
% Copyright (C) 2011-2014 SUPELEC
%
% Authors: Julien Bect <julien.bect@centralesupelec.fr>
% Emmanuel Vazquez <emmanuel.vazquez@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 w = linsolve (kreq, rs)
if nargin < 2
rs = kreq.RS;
end
% Solves the linear equation A * ws = rs, where A is the kriging matrix
w = linsolve (kreq.LS_R, kreq.LS_Q' * rs, struct ('UT', true));
end % function
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