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% STK_GENERATE_SAMPLEPATHS [overload STK function]
% Copyright Notice
%
% Copyright (C) 2017, 2018 CentraleSupelec
%
% Author: 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 zsim = stk_generate_samplepaths (model, varargin)
switch nargin
case {0, 1}
stk_error ('Not enough input arguments.', 'NotEnoughInputArgs');
case 2
% CALL: ZSIM = stk_generate_samplepaths (MODEL, XT)
xt = varargin{1};
nb_paths = 1;
conditional = false;
case 3
% CALL: ZSIM = stk_generate_samplepaths (MODEL, XT, NB_PATHS)
xt = varargin{1};
nb_paths = varargin{2};
conditional = false;
case 4
% CALL: ZSIM = stk_generate_samplepaths (MODEL, XI, ZI, XT)
xi = varargin{1};
zi = varargin{2};
xt = varargin{3};
nb_paths = 1;
conditional = true;
otherwise
% CALL: ZSIM = stk_generate_samplepaths (MODEL, XI, ZI, XT, NB_PATHS)
xi = varargin{1};
zi = varargin{2};
xt = varargin{3};
nb_paths = varargin{4};
conditional = true;
end
if ~ isa (model, 'stk_model_gpposterior')
stk_error ('Syntax error.', 'SyntaxError');
end
if conditional
model = stk_model_update (model, xi, zi);
end
xi = stk_get_input_data (model);
zi = stk_get_output_data (model);
model = stk_get_prior_model (model);
zsim = stk_generate_samplepaths (model, xi, zi, xt, nb_paths);
end % function
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