/* cdf/exponential.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> /* 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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