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% STK_PARAM_GETDEFAULTBOUNDS_LNV [STK internal]
% Copyright Notice
%
% Copyright (C) 2017, 2018 CentraleSupelec
% Copyright (C) 2017 LNE
% Copyright (C) 2012 SUPELEC
%
% Authors: Emmanuel Vazquez <emmanuel.vazquez@centralesupelec.fr>
% Remi Stroh <remi.stroh@lne.fr>
% Julien Bect <julien.bect@centralesupelec.fr>
% 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 [lb_lnv, ub_lnv] = stk_param_getdefaultbounds_lnv ...
(model, lnv0, xi, zi) %#ok<INUSL>
if isnumeric (lnv0)
if isscalar (lnv0)
TOLVAR = 0.5;
% Bounds for the variance parameter
empirical_variance = var (zi);
lb_lnv = log (eps);
ub_lnv = log (empirical_variance) + TOLVAR;
% Make sure that lnv0 falls within the bounds
if ~ isempty (lnv0)
lb_lnv = min (lb_lnv, lnv0 - TOLVAR);
ub_lnv = max (ub_lnv, lnv0 + TOLVAR);
end
else
lb_lnv = [];
ub_lnv = [];
end
else % parameter object
[lb_lnv, ub_lnv] = stk_param_getdefaultbounds (lnv0, xi, zi);
end
end % function
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