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% STK_MODEL_FIXLM [STK internal]
%
% This internal STK function ensures backward compatiblity for model structures
% with a .order field.
% Copyright Notice
%
% Copyright (C) 2016 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 model = stk_model_fixlm (model)
if isfield (model, 'lm') % Modern style: .lm field
if isfield (model, 'order')
% If model.order is also present, it should be NaN
if ~ isnan (model.order)
% We also tolerate the case where model.order is compatible with
% model.lm (i.e., model.lm is a polynomial trend object, with the
% appropriate degree.
if ((model.order == -1) && (isa (model.lm, 'stk_lm_null'))) ...
|| ((model.order == 0) && (isa (model.lm, 'stk_lm_constant'))) ...
|| ((model.order == 1) && (isa (model.lm, 'stk_lm_affine'))) ...
|| ((model.order == 2) && (isa (model.lm, 'stk_lm_quadratic'))) ...
|| ((model.order == 3) && (isa (model.lm, 'stk_lm_cubic')))
model.order = nan;
else
stk_error (sprintf (['Invalid model structure: both ' ...
'model.lm and model.order are present, and their ' ...
'values are not compatible.\nThe ''.order'' field ' ...
'is deprecated, please consider using ''.lm'' only.']), ...
'InvalidArgument');
end
end % if ~ isnan (model.order)
model = rmfield (model, 'order');
end % if isfield (model.order)
elseif isfield (model, 'order') % Old style: .order field only
model.lm = stk_lm_polynomial (model.order);
model = rmfield (model, 'order');
else % Assume constant mean when neither .order nor .lm is present
model.lm = stk_lm_constant ();
end
end % function
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