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% @STK_SAMPCRIT_EQI/SET [overload base function]
% Copyright Notice
%
% Copyright (C) 2017 CentraleSupelec
%
% Author: 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 crit = set (crit, propname, value)
switch propname
case 'model'
if isempty (value)
crit.model = [];
crit.current_minimum = +inf;
else
crit.model = value;
crit.current_minimum = compute_current_minimum (crit);
end
case 'quantile_order'
order = double (value);
if (~ isscalar (order)) || (order < 0) || (order > 1)
stk_error (['The value of property ''quantile_order'' ' ...
'must be a scalar between 0 and 1.'], 'InvalidArgument');
else
crit.quantile_order = order;
try
crit.quantile_value = norminv (order);
catch
crit.quantile_value = - sqrt (2) * erfcinv (2 * order); % CG#09
end
end
if ~ isempty (crit.model)
crit.current_minimum = compute_current_minimum (crit);
end
case 'point_batch_size'
if ischar (value)
crit.point_batch_size = str2func (value);
elseif isa (value, 'function_handle')
crit.point_batch_size = value;
else % Last possibility: a fixed numeric value
point_batch_size = double (value);
if (~ isscalar (point_batch_size)) || (point_batch_size <= 0) ...
|| (point_batch_size ~= floor (point_batch_size))
stk_error ('Incorrect ''point_batch_size'' value', ...
'InvalidArgument');
else
crit.point_batch_size = point_batch_size;
end
end
case 'current_minimum' % Visible but read-only property
stk_error (sprintf (['Property ''current_minimum'' is read-only.' ...
'\n\nWHY: The value of ''current_minimum'' is computed ' ...
'automatically from the input data of the model.']), ...
'ReadOnlyProperty');
case 'quantile_value' % Hidden, read-only property
stk_error (sprintf (['Property ''quantile_value'' is read-only.' ...
'\n\nWHY: The value of ''quantile_value'' is computed ' ...
'automatically from the value of ''quantile_order''.']), ...
'ReadOnlyProperty');
otherwise
errmsg = sprintf ('There is no property named %s', propname);
stk_error (errmsg, 'InvalidArgument');
end % switch
end % function
function m = compute_current_minimum (crit)
xi = stk_get_input_data (crit.model);
if isempty (xi)
m = +inf;
else
zp = stk_predict (crit.model, xi);
q = zp.mean + crit.quantile_value * (sqrt (zp.var));
m = min (q);
end
end % function
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