/src/r-source/src/nmath/dunif.c
Line | Count | Source |
1 | | /* |
2 | | * Mathlib : A C Library of Special Functions |
3 | | * Copyright (C) 1998 Ross Ihaka |
4 | | * Copyright (C) 2000 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 | | * https://www.R-project.org/Licenses/ |
19 | | * |
20 | | * DESCRIPTION |
21 | | * |
22 | | * The density of the uniform distribution. |
23 | | */ |
24 | | |
25 | | #include "nmath.h" |
26 | | #include "dpq.h" |
27 | | |
28 | | double dunif(double x, double a, double b, int give_log) |
29 | 0 | { |
30 | 0 | #ifdef IEEE_754 |
31 | 0 | if (ISNAN(x) || ISNAN(a) || ISNAN(b)) |
32 | 0 | return x + a + b; |
33 | 0 | #endif |
34 | 0 | if (b <= a) ML_WARN_return_NAN; |
35 | |
|
36 | 0 | if (a <= x && x <= b) |
37 | 0 | return give_log ? -log(b - a) : 1. / (b - a); |
38 | 0 | return R_D__0; |
39 | 0 | } |