56 lines
1.5 KiB
Matlab
56 lines
1.5 KiB
Matlab
function n = get_difference_order(var)
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% Returns true iff endogenous variable `var` is a variable in difference.
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%
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% INPUTS
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% - var [string, integer] Variable name or index in M_.endo_names.
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%
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% OUTPUTS
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% - boo [logical] true/false.
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% Copyright © 2018 Dynare Team
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%
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% This file is part of Dynare.
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%
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% Dynare is free software: you can redistribute it and/or modify
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% it under the terms of the GNU General Public License as published by
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% the Free Software Foundation, either version 3 of the License, or
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% (at your option) any later version.
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%
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% Dynare is distributed in the hope that it will be useful,
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% but WITHOUT ANY WARRANTY; without even the implied warranty of
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% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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% GNU General Public License for more details.
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%
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% You should have received a copy of the GNU General Public License
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% along with Dynare. If not, see <https://www.gnu.org/licenses/>.
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global M_
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% Get index of the auxiliary
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id = get_aux_variable_id(var);
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% Set default difference order
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n = 0;
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% If var is not an auxiliary variable it cannot be a first difference.
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if ~id, return, end
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while id
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if M_.aux_vars(id).type==8
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% diff auxiliary variable.
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n = n+1;
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v = M_.aux_vars(id).orig_index;
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if v<=M_.orig_endo_nbr
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id = 0;
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else
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id = get_aux_variable_id(v);
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end
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elseif M_.aux_vars(id).type==9
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% lagged diff auxiliary variable
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v = M_.aux_vars(id).orig_index;
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id = get_aux_variable_id(v);
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else
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break
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end
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end |