function set_shocks(flag,k,ivar,values)

% function set_shocks(flag,k,ivar,values)
% writes a deterministic shock into exo_simul or exo_det_simul
%
% INPUTS
%    flag=0:    replaces exo_simul  
%    flag=1:    multiplicative shock into exo_simul
%    flag=2:    replaces exo_det_simul
%    flag=3:    multipliczative shock into exo_det_simul
%    k:         period
%    ivar:      indice of exogenous variables
%    values:    shock values
%
% OUTPUTS
%    none
%        
% SPECIAL REQUIREMENTS
%    none

% Copyright (C) 2003-2011 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 oo_ M_

k = k + M_.maximum_lag;
n1 = size(oo_.exo_simul,1);
n2 = size(oo_.exo_det_simul,1);
if k(end) > n1 && flag <= 1
    oo_.exo_simul = [oo_.exo_simul; repmat(oo_.exo_steady_state',k(end)-n1,1)];
elseif k(end) > n2 && flag > 1
    oo_.exo_det_simul = [oo_.exo_det_simul; repmat(oo_.exo_det_steady_state',k(end)-n2,1)];
end

switch flag
  case 0
    if size(values,1) == 1
        oo_.exo_simul(k,ivar) = repmat(values,length(k),1);
    else
        oo_.exo_simul(k,ivar) = values;
    end
  case 1
    oo_.exo_simul(k,ivar) = oo_.exo_simul(k,ivar).*values;
  case 2
    if size(values,1) == 1
        oo_.exo_det_simul(k,ivar) = repmat(values,length(k),1);
    else
        oo_.exo_det_simul(k,ivar) = values;
    end
  case 3
    oo_.exo_det_simul(k,ivar) = oo_.exo_det_simul(k,ivar).*values;
end