/*
  Copyright (C) 2005 Steven L. Scott

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  This library 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
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
*/

/*
 *  Mathlib : A C Library of Special Functions
 *  Copyright (C) 1998 Ross Ihaka
 *  Copyright (C) 2000 The R Development Core Team
 *
 *  This program 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 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA.
 *
 *  SYNOPSIS
 *
 *    #include "Rnorm.h"
 *    double rnorm(double mu, double sigma);
 *
 *  DESCRIPTION
 *
 *    Random variates from the normal distribution.
 *
 */

#include "nmath.hpp"
#include "cpputil/report_error.hpp"
#include <sstream>

namespace Rmath{

  double rnorm_mt(BOOM::RNG & rng, double mu, double sigma)
  {
    if(!R_FINITE(mu) || !R_FINITE(sigma) || sigma < 0.){
      std::ostringstream err;
      err << "Illegal value for mu: " << mu << " or sigma: " << sigma
          << " in rnorm_mt." << std::endl;
      BOOM::report_error(err.str());
    }
    if (sigma == 0.)
      return mu;
    else
      return mu + sigma * norm_rand(rng);
  }

  double rnorm(double mu, double sigma){
    return rnorm_mt(BOOM::GlobalRng::rng, mu, sigma);
  }

}
