diff options
Diffstat (limited to 'gsl-1.9/cdf/gumbel2.c')
-rw-r--r-- | gsl-1.9/cdf/gumbel2.c | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/gsl-1.9/cdf/gumbel2.c b/gsl-1.9/cdf/gumbel2.c new file mode 100644 index 0000000..62df56b --- /dev/null +++ b/gsl-1.9/cdf/gumbel2.c @@ -0,0 +1,59 @@ +/* cdf/gumbel2.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., 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_gumbel2_P (const double x, const double a, const double b) +{ + double P; + + if (x == 0) + { + P = 0; + } + else + { + double u = pow (x, a); + P = exp (-b / u); + } + + return P; +} + +double +gsl_cdf_gumbel2_Q (const double x, const double a, const double b) +{ + double Q; + + if (x == 0) + { + Q = 1; + } + else + { + double u = pow (x, a); + Q = -expm1 (-b / u); + } + + return Q; +} |