87 lines
3.4 KiB
Matlab
87 lines
3.4 KiB
Matlab
function [pnames, enames, xnames, pid, eid, xid] = get_variables_and_parameters_in_equation(lhs, rhs, DynareModel)
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% Returns the lists of parameters, endogenous variables and exogenous variables in an equation.
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%
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% INPUTS
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% - lhs [string] Left hand side of an equation.
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% - rhs [string] Right hand side of an equation.
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% - DynareModel [struct] Structure describing the current model (M_).
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%
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% OUTPUTS
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% - pnames [cell] Cell of row char arrays (p elements), names of the parameters.
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% - enames [cell] Cell of row char arrays (n elements), names of the endogenous variables.
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% - xnames [cell] Cell of row char arrays (m elements), names of the exogenous variables.
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% - pid [Integer] p*1 vector of indices in M_.param_names for the listed parameters in params.
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% - eid [Integer] n*1 vector of indices in M_.endo_names for the listed parameters in endogenous.
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% - xid [Integer] m*1 vector of indices in M_.exo_names for the listed parameters in exogenous.
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% Copyright (C) 2018-2019 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 <http://www.gnu.org/licenses/>.
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% Get the tokens in the rhs member of the equation.
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rhs_ = strsplit(rhs,{'+','-','*','/','^', ...
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'log(', 'log10(', 'ln(', 'exp(', ...
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'sqrt(', 'abs(', 'sign(', ...
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'sin(', 'cos(', 'tan(', 'asin(', 'acos(', 'atan(', ...
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'min(', 'max(', ...
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'normcdf(', 'normpdf(', 'erf(', ...
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'diff(', 'adl(', '(', ')'});
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% Filter out the numbers and punctuation.
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rhs_(cellfun(@(x) all(isstrprop(x, 'digit')+isstrprop(x, 'punct')), rhs_)) = [];
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% Get list of parameters.
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pnames = DynareModel.param_names;
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pnames = intersect(rhs_, pnames);
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% Get list of endogenous variables.
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enames = DynareModel.endo_names;
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enames = intersect(rhs_, enames);
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% Get list of exogenous variables
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xnames = DynareModel.exo_names;
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xnames = intersect(rhs_, xnames);
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% Decide if we are dealing with a dynamic model. If so, the lhs variable
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% already belongs to enames, we remove this variable from enames.
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id = find(strcmp(lhs, enames));
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if ~isempty(id)
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enames(id) = [];
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end
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% Add lhs variable in first position of enames.
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enames = [lhs; enames];
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% Returns vector of indices for parameters endogenous and exogenous
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% variables if required.
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if nargout>3
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p = length(pnames);
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pid = zeros(p, 1);
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for i = 1:p
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pid(i) = find(strcmp(pnames{i}, DynareModel.param_names));
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end
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p = length(enames);
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eid = zeros(p, 1);
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for i = 1:p
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eid(i) = find(strcmp(enames{i}, DynareModel.endo_names));
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end
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p = length(xnames);
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xid = zeros(p, 1);
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for i = 1:p
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xid(i) = find(strcmp(xnames{i}, DynareModel.exo_names));
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end
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end |