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Diffstat (limited to 'gsl-1.9/cdf/beta.c')
-rw-r--r-- | gsl-1.9/cdf/beta.c | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/gsl-1.9/cdf/beta.c b/gsl-1.9/cdf/beta.c new file mode 100644 index 0000000..524391d --- /dev/null +++ b/gsl-1.9/cdf/beta.c @@ -0,0 +1,66 @@ +/* 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; +} |