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- /* cdf/exponential.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 "gsl__config.h"
- #include <math.h>
- #include "gsl_math.h"
- #include "gsl_cdf.h"
- /* The exponential distribution has the form
- p(x) dx = exp(-x/mu) dx/mu
- for x = 0 ... +infty */
- double
- gsl_cdf_exponential_P (const double x, const double mu)
- {
- if (x < 0)
- {
- return 0;
- }
- else
- {
- double P = -expm1 (-x / mu);
- return P;
- }
- }
- double
- gsl_cdf_exponential_Q (const double x, const double mu)
- {
- if (x < 0)
- {
- return 1;
- }
- else
- {
- double Q = exp (-x / mu);
- return Q;
- }
- }
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