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function Model = setup_solvers(Model)
% Setup solve_algo={12,14} by identifying equations with a log on the left hand side.
%
% INPUTS
% - Model [struct] Model description, aka M_.
% - Options [struct] Dynare's options, aka options_.
%
% OUTPUTS
% - Model [struct] Updated model description.
% Copyright © 2020 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/>.
cannot_use_solve_algo_12_14 = false;
try
json = loadjson_(sprintf('%s/model/json/modfile.json', Model.fname));
catch
cannot_use_solve_algo_12_14 = true;
message = 'Algorithms solve_algo={12,14} require json output of the model (use json=compute option)';
end
if ~cannot_use_solve_algo_12_14
lhs = cell(length(json.model),1);
isauxdiffloggedrhs = false(length(json.model), 1);
for i = 1:length(json.model)
if length(json.model)>1
lhs{i} = json.model{i}.lhs;
else
lhs{i} = json.model.lhs;
end
if isempty(regexp(lhs{i}, '^\w+$|^log\(\w+\)$'))
cannot_use_solve_algo_12_14 = true;
message = sprintf('With solve_algo={12,14}, each equation must have on the left hand side a single variable or logged variable (equation %d does not satisfy this condition).', i);
break
end
if length(json.model)>1
rhs = json.model{i}.rhs;
else
rhs = json.model.lhs;
end
if i>Model.orig_endo_nbr && ~isempty(regexp(lhs{i}, '\<AUX_DIFF_(\d*)\>', 'once')) && ismember(lhs{i}, lhs(1:i-1)) && ...
~isempty(regexp(rhs, 'log\(\w*\)-log\(\w*\(-1\)\)', 'once'))
isauxdiffloggedrhs(i) = true;
end
end
end
if ~cannot_use_solve_algo_12_14
islog = @(x) ~isempty(regexp(x, 'log\(\w*\)', 'once'));
lhs0 = lhs;
for i=1:length(json.model)
if islog(lhs{i})
lhs0{i} = strrep(strrep(lhs{i}, 'log(', ''), ')', '');
end
end
if ~isequal(length(unique(lhs0(1:Model.orig_endo_nbr))), length(lhs0(1:Model.orig_endo_nbr)))
cannot_use_solve_algo_12_14 = true;
message = sprintf('With solve_algo={12,14}, each equation must determine a different endogenous variable.')
end
end
if cannot_use_solve_algo_12_14
Model.isloggedlhs = {};
Model.lhs = {};
Model.isauxdiffloggedrhs = [];
Model.possible_to_use_solve_algo_12_14 = false;
Model.message_solve_algo_12_14 = message;
else
Model.isloggedlhs = cellfun(islog, lhs);
Model.lhs = lhs;
Model.isauxdiffloggedrhs = isauxdiffloggedrhs;
Model.possible_to_use_solve_algo_12_14 = true;
Model.message_solve_algo_12_14 = '';
end
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