-
-
Notifications
You must be signed in to change notification settings - Fork 5.4k
/
plogis.c
39 lines (35 loc) · 1.29 KB
/
plogis.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
/*
* R : A Computer Language for Statistical Data Analysis
* Copyright (C) 1995, 1996 Robert Gentleman and Ross Ihaka
* Copyright (C) 2000 The R Development Core Team
*
* 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
* http:https://www.r-project.org/Licenses/
*/
#include "nmath.h"
#include "dpq.h"
double plogis(double x, double location, double scale,
int lower_tail, int log_p)
{
#ifdef IEEE_754
if (ISNAN(x) || ISNAN(location) || ISNAN(scale))
return x + location + scale;
#endif
if (scale <= 0.0) ML_ERR_return_NAN;
x = (x - location) / scale;
if (ISNAN(x)) ML_ERR_return_NAN;
R_P_bounds_Inf_01(x);
x = exp(lower_tail ? -x : x);
return (log_p ? -log1p(x) : 1 / (1 + x));
}