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/* cdf/cdf_beta.c
*
* Copyright (C) 2003 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 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.
*/
#include <config.h>
#include <math.h>
#include <gsl/gsl_cdf.h>
#include <gsl/gsl_sf_gamma.h>
#include <gsl/gsl_math.h>
#include "beta_inc.c"
double
gsl_cdf_beta_P (const double x, const double a, const double b)
{
double P;
if (x <= 0.0 )
{
return 0.0;
}
if ( x >= 1.0 )
{
return 1.0;
}
P = beta_inc_AXPY (1.0, 0.0, a, b, x);
return P;
}
double
gsl_cdf_beta_Q (const double x, const double a, const double b)
{
double Q;
if ( x >= 1.0)
{
return 0.0;
}
if ( x <= 0.0 )
{
return 1.0;
}
Q = beta_inc_AXPY (-1.0, 1.0, a, b, x);
return Q;
}
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