function oo_=make_y_(M_,options_,oo_)
% function oo_=make_y_(M_,options_,oo_)
% forms oo_.endo_simul as guess values for deterministic simulations
%
% INPUTS
%   M_:           Dynare model structure
%   options_:     Dynare options structure
%   oo_:          Dynare results structure
%
% OUTPUTS
%   oo_:          Dynare results structure
%
% ALGORITHM
%   ...
% SPECIAL REQUIREMENTS
%   none
%

% Copyright (C) 1996-2017 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 <http://www.gnu.org/licenses/>.

global ys0_

if options_.steadystate_flag
    [oo_.steady_state,M_.params,check] = ...
        evaluate_steady_state_file(oo_.steady_state,oo_.exo_steady_state,M_, ...
                                   options_,~options_.steadystate.nocheck);
end

if isempty(oo_.steady_state)
    oo_.steady_state = zeros(M_.endo_nbr,1);
end

if isempty(M_.endo_histval)
    if isempty(ys0_)
        oo_.endo_simul = [oo_.steady_state*ones(1,M_.maximum_lag+options_.periods+M_.maximum_lead)];
    else
        oo_.endo_simul = [ys0_*ones(1,M_.maximum_lag) oo_.steady_state*ones(1,options_.periods+M_.maximum_lead)];
    end
else
    if ~isempty(ys0_)
        error('histval and endval cannot be used simultaneously')
    end
    % the first NaNs take care of the case where there are lags > 1 on
    % exogenous variables
    oo_.endo_simul = [M_.endo_histval ...
                      oo_.steady_state*ones(1,options_.periods+M_.maximum_lead)];
end