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% STK_LM_POLYNOMIAL creates a polynomial linear model object
%
% CALL: LM = STK_LM_POLYNOMIAL (D)
%
% creates a polynomial linear model object LM of degree D.
% Copyright Notice
%
% Copyright (C) 2016-2018 CentraleSupelec
% Copyright (C) 2012-2014 SUPELEC
%
% 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 lm = stk_lm_polynomial (order)
% nargin check neded here. See https://sourceforge.net/p/kriging/tickets/52.
if nargin < 1
stk_error ('Not enough input arguments.', 'NotEnoughInputArgs');
end
switch order
case -1, % 'simple' kriging
lm = stk_lm_null ();
case 0, % 'ordinary' kriging
lm = stk_lm_constant ();
case 1, % affine trend
lm = stk_lm_affine ();
case 2, % quadratic trend
lm = stk_lm_quadratic ();
case 3, % cubic trend
lm = stk_lm_cubic ();
otherwise, % syntax error
stk_error ('order should be in {-1, 0, 1, 2, 3}', 'InvalidArgument');
end
end % function
%!error lm = stk_lm_polynomial ();
%!test
%! lm = stk_lm_polynomial (-1);
%! assert (isa (lm, 'stk_lm_null'));
%!test
%! lm = stk_lm_polynomial (0);
%! assert (isa (lm, 'stk_lm_constant'));
%!test
%! lm = stk_lm_polynomial (1);
%! assert (isa (lm, 'stk_lm_affine'));
%!test
%! lm = stk_lm_polynomial (2);
%! assert (isa (lm, 'stk_lm_quadratic'));
%!test
%! lm = stk_lm_polynomial (3);
%! assert (isa (lm, 'stk_lm_cubic'));
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