/* cdf/pareto.c

 * 

 * Copyright (C) 2003, 2007 Brian Gough

 * 

 * 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 3 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

 */

#include <config.h>

#include <math.h>

#include <gsl/gsl_math.h>

#include <gsl/gsl_cdf.h>

double

gsl_cdf_pareto_P (const double x, const double a, const double b)

{

  double P;

  if (x < b)

    {

      P = 0;

    }

  else

    {

      P = 1 - pow(b/x, a);

    }

  return P;

}

double

gsl_cdf_pareto_Q (const double x, const double a, const double b)

{

  double Q;

  if (x < b)

    {

      Q = 1;

    } 

  else

    {

      Q = pow(b/x, a);

    }

  return Q;

}