148 lines
5.1 KiB
Matlab
148 lines
5.1 KiB
Matlab
function [dr,info]=PCL_resol(ys,check_flag)
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% function [dr,info]=PCL_resol(ys,check_flag)
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% Computes first and second order approximations
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%
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% INPUTS
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% ys: vector of variables in steady state
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% check_flag=0: all the approximation is computed
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% check_flag=1: computes only the eigenvalues
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%
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% OUTPUTS
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% dr: structure of decision rules for stochastic simulations
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% info=1: the model doesn't determine the current variables '...' uniquely
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% info=2: MJDGGES returns the following error code'
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% info=3: Blanchard Kahn conditions are not satisfied: no stable '...' equilibrium
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% info=4: Blanchard Kahn conditions are not satisfied:'...' indeterminacy
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% info=5: Blanchard Kahn conditions are not satisfied:'...' indeterminacy due to rank failure
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% info=6: The jacobian evaluated at the steady state is complex.
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% info=19: The steadystate file did not compute the steady state (inconsistent deep parameters).
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% info=20: can't find steady state info(2) contains sum of sqare residuals
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% info=21: steady state is complex
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% info(2) contains sum of sqare of
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% imaginary part of steady state
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% info=30: Variance can't be computed
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%
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% SPECIAL REQUIREMENTS
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% none
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% Copyright (C) 2001-2017 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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global M_ options_ oo_
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global it_
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jacobian_flag = false;
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info = 0;
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it_ = M_.maximum_lag + 1 ;
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if M_.exo_nbr == 0
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oo_.exo_steady_state = [] ;
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end
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% check if ys is steady state
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tempex = oo_.exo_simul;
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oo_.exo_simul = repmat(oo_.exo_steady_state',M_.maximum_lag+M_.maximum_lead+1,1);
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if M_.exo_det_nbr > 0
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tempexdet = oo_.exo_det_simul;
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oo_.exo_det_simul = repmat(oo_.exo_det_steady_state',M_.maximum_lag+M_.maximum_lead+1,1);
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end
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dr.ys = ys;
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check1 = 0;
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% testing for steadystate file
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fh = str2func([M_.fname '.static']);
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if options_.steadystate_flag
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[dr.ys,check1] = feval([M_.fname '_steadystate'],dr.ys,...
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[oo_.exo_steady_state; ...
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oo_.exo_det_steady_state]);
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if size(dr.ys,1) < M_.endo_nbr
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if length(M_.aux_vars) > 0
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dr.ys = add_auxiliary_variables_to_steadystate(dr.ys,M_.aux_vars,...
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M_.fname,...
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oo_.exo_steady_state,...
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oo_.exo_det_steady_state,...
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M_.params);
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else
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error([M_.fname '_steadystate.m doesn''t match the model']);
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end
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end
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else
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% testing if ys isn't a steady state or if we aren't computing Ramsey policy
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if ~options_.ramsey_policy
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if options_.linear == 0
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% nonlinear models
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if max(abs(feval(fh,dr.ys,[oo_.exo_steady_state; ...
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oo_.exo_det_steady_state], M_.params))) > options_.solve_tolf
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opt = options_;
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opt.jacobian_flag = false;
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[dr.ys,check1] = dynare_solve(fh,dr.ys,opt,...
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[oo_.exo_steady_state; ...
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oo_.exo_det_steady_state], M_.params);
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end
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else
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% linear models
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[fvec,jacob] = feval(fh,dr.ys,[oo_.exo_steady_state;...
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oo_.exo_det_steady_state], M_.params);
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if max(abs(fvec)) > 1e-12
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dr.ys = dr.ys-jacob\fvec;
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end
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end
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end
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end
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% testing for problem
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if check1
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if options_.steadystate_flag
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info(1)= 19;
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resid = check1 ;
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else
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info(1)= 20;
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resid = feval(fh,ys,oo_.exo_steady_state, M_.params);
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end
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info(2) = resid'*resid ;
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return
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end
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if ~isreal(dr.ys)
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info(1) = 21;
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info(2) = sum(imag(ys).^2);
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dr.ys = real(dr.ys);
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return
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end
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dr.fbias = zeros(M_.endo_nbr,1);
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if( options_.partial_information || options_.ACES_solver)%&& (check_flag == 0)
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[dr,info,M_,options_,oo_] = dr1_PI(dr,check_flag,M_,options_,oo_);
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else
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[dr,info,M_,options_,oo_] = dr1(dr,check_flag,M_,options_,oo_);
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end
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if info(1)
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return
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end
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if M_.exo_det_nbr > 0
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oo_.exo_det_simul = tempexdet;
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end
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oo_.exo_simul = tempex;
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tempex = [];
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% 01/01/2003 MJ added dr_algo == 1
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% 08/24/2001 MJ uses Schmitt-Grohe and Uribe (2001) constant correction
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% in dr.ghs2
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% 05/26/2003 MJ added temporary values for oo_.exo_simul
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