40 lines
1.6 KiB
Matlab
40 lines
1.6 KiB
Matlab
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function objects = get_variables_and_parameters_in_expression(expr)
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% Returns the variables and parameters appearing in an expression.
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%
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% INPUTS
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% - expr [char] 1×m char array, dynare model expression (typically RHS or LHS of an equation).
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%
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% OUTPUTS
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% - objects [cell] cell of row char arrays, names of the variables and parameters in expr.
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% Copyright (C) 2020 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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objects = strsplit(expr, {'+','-','*','/','^', ...
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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(', '(', ')', '\n', '\t', ' '});
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% Filter out the numbers, punctuation.
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objects(cellfun(@(x) all(isstrprop(x, 'digit')+isstrprop(x, 'punct')), objects)) = [];
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% Filter out empty elements.
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objects(cellfun(@(x) all(isempty(x)), objects)) = [];
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