49 lines
1.7 KiB
Matlab
49 lines
1.7 KiB
Matlab
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 © 2020-2022 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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if iscell(expr)
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objects = splitexpr(expr{1});
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for i=2:length(expr)
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objects = [objects, splitexpr(expr{i})];
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end
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else
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objects = splitexpr(expr);
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end
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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 functions
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objects(cellfun(@(x) ismember(x, {'log', 'log10', 'ln', 'exp', 'sqrt', 'abs', 'sign', 'sin', 'cos', 'tan', 'asin', 'acos', 'atan', 'min', 'max', 'normcdf', 'normpdf', 'erf', 'diff', 'adl'}), objects)) = [];
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% Filter out empty elements.
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objects(cellfun(@(x) all(isempty(x)), objects)) = [];
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function o = splitexpr(expr)
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o = strsplit(expr, {'+','-','*','/','^', '(', ')', ',', '\n', '\t', ' '});
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