1function [endogenousvariables, info] = sim1_purely_forward(endogenousvariables, exogenousvariables, steadystate, M, options)
2% Performs deterministic simulation of a purely forward model
3
4% Copyright (C) 2012-2017 Dynare Team
5%
6% This file is part of Dynare.
7%
8% Dynare is free software: you can redistribute it and/or modify
9% it under the terms of the GNU General Public License as published by
10% the Free Software Foundation, either version 3 of the License, or
11% (at your option) any later version.
12%
13% Dynare is distributed in the hope that it will be useful,
14% but WITHOUT ANY WARRANTY; without even the implied warranty of
15% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16% GNU General Public License for more details.
17%
18% You should have received a copy of the GNU General Public License
19% along with Dynare.  If not, see <http://www.gnu.org/licenses/>.
20
21ny0 = nnz(M.lead_lag_incidence(1,:));    % Number of variables at current period
22iyf = find(M.lead_lag_incidence(2,:)>0); % Indices of variables at next period
23
24if ny0 ~= M.endo_nbr
25    error('All endogenous variables must appear at the current period!')
26end
27
28dynamicmodel = str2func([M.fname,'.dynamic']);
29
30info.status = 1;
31
32for it = options.periods:-1:1
33    yf = endogenousvariables(:,it+1); % Values at next period, also used as guess value for current period
34    yf1 = yf(iyf);
35    [tmp, check] = solve1(dynamicmodel, [yf; yf1], 1:M.endo_nbr, 1:M.endo_nbr, ...
36                          1, options.gstep, options.dynatol.f, ...
37                          options.dynatol.x, options.simul.maxit, ...
38                          options.debug, exogenousvariables, M.params, steadystate, ...
39                          it+M.maximum_lag);
40    if check
41        info.status = 0;
42    end
43    endogenousvariables(:,it) = tmp(1:M.endo_nbr);
44end
45