3 * Copyright (C) 2004 Jason H. Stover.
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 3 of the License, or (at
8 * your option) any later version.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
22 #include <gsl/gsl_math.h>
23 #include <gsl/gsl_errno.h>
24 #include <gsl/gsl_cdf.h>
28 /* Pr (X <= k), i.e., the probability of n or fewer failures until the
32 gsl_cdf_geometric_P (const unsigned int k, const double p)
36 if (p > 1.0 || p < 0.0)
38 CDF_ERROR ("p < 0 or p > 1", GSL_EDOM);
51 P = -expm1 (a * log1p (-p));
62 gsl_cdf_geometric_Q (const unsigned int k, const double p)
66 if (p > 1.0 || p < 0.0)
68 CDF_ERROR ("p < 0 or p > 1", GSL_EDOM);
81 Q = exp (a * log1p (-p));