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function n = get_difference_order(var)
% Returns true iff endogenous variable `var` is a variable in difference.
%
% INPUTS
% - var [string, integer] Variable name or index in M_.endo_names.
%
% OUTPUTS
% - boo [logical] true/false.
% Copyright © 2018 Dynare Team
%
% This file is part of Dynare.
%
% Dynare 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.
%
% Dynare 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 Dynare. If not, see <https://www.gnu.org/licenses/>.
global M_
% Get index of the auxiliary
id = get_aux_variable_id(var);
% Set default difference order
n = 0;
% If var is not an auxiliary variable it cannot be a first difference.
if ~id, return, end
while id
if M_.aux_vars(id).type==8
% diff auxiliary variable.
n = n+1;
v = M_.aux_vars(id).orig_index;
if v<=M_.orig_endo_nbr
id = 0;
else
id = get_aux_variable_id(v);
end
elseif M_.aux_vars(id).type==9
% lagged diff auxiliary variable
v = M_.aux_vars(id).orig_index;
id = get_aux_variable_id(v);
else
break
end
end
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