1 /*
2 * R : A Computer Language for Statistical Data Analysis
3 * Copyright (C) 1995, 1996 Robert Gentleman and Ross Ihaka
4 * Copyright (C) 2000--2008 The R Core Team
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, a copy is available at
18 * http://www.r-project.org/Licenses/
19 */
20
21 #include "nmath.h"
22
rlogis(double location,double scale)23 double rlogis(double location, double scale)
24 {
25 if (ISNAN(location) || !R_FINITE(scale))
26 ML_ERR_return_NAN;
27
28 if (scale == 0. || !R_FINITE(location))
29 return location;
30 else {
31 double u = unif_rand();
32 return location + scale * log(u / (1. - u));
33 }
34 }
35