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function [xparams, logpost] = GetOneDraw(type,M_,estim_params_,oo_,options_,bayestopt_)
% function [xparams, logpost] = GetOneDraw(type,M_,estim_params_,oo_,options_,bayestopt_)
% draws one parameter vector and its posterior from MCMC or the prior
%
% INPUTS
% type: [string] 'posterior': draw from MCMC draws
% 'prior': draw from prior
% M_ [structure] Definition of the model
% estim_params_ [structure] characterizing parameters to be estimated
% oo_ [structure] Storage of results
% options_ [structure] Options
% bayestopt_ [structure] describing the priors
%
% OUTPUTS
% xparams: vector of estimated parameters (drawn from posterior or prior distribution)
% logpost: log of the posterior density of this parameter vector
%
% SPECIAL REQUIREMENTS
% none
% Copyright (C) 2005-2017 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/>.
switch type
case 'posterior'
[xparams, logpost] = metropolis_draw(0);
case 'prior'
xparams = prior_draw();
if nargout>1
logpost = evaluate_posterior_kernel(xparams',M_,estim_params_,oo_,options_,bayestopt_);
end
end
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