| /* |
| * Mathlib : A C Library of Special Functions |
| * Copyright (C) 1998 Ross Ihaka |
| * Copyright (C) 2000-8 The R Core Team |
| * Copyright (C) 2005 The R Foundation |
| * |
| * 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, a copy is available at |
| * https://www.R-project.org/Licenses/ |
| * |
| * DESCRIPTION |
| * |
| * This the lognormal quantile function. |
| */ |
| |
| #include "nmath.h" |
| #include "dpq.h" |
| |
| double qlnorm(double p, double meanlog, double sdlog, int lower_tail, int log_p) |
| { |
| #ifdef IEEE_754 |
| if (ISNAN(p) || ISNAN(meanlog) || ISNAN(sdlog)) |
| return p + meanlog + sdlog; |
| #endif |
| R_Q_P01_boundaries(p, 0, ML_POSINF); |
| |
| return exp(qnorm(p, meanlog, sdlog, lower_tail, log_p)); |
| } |