log1p - Online Linux Manual PageSection : 3
Updated : 2023-02-05
Source : Linux man-pages 6.03
NAMElog1p, log1pf, log1pl − logarithm of 1 plus argument
LIBRARYMath library (libm, −lm)
SYNOPSIS#include <math.h>double log1p(double x);
float log1pf(float x);
long double log1pl(long double x);Feature Test Macro Requirements for glibc (see feature_test_macros(7)): log1p():
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
|| _XOPEN_SOURCE >= 500
|| /* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCElog1pf(), log1pl(): _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
|| /* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
DESCRIPTIONThese functions return a value equivalent to log (1 + x)The result is computed in a way that is accurate even if the value of x is near zero.
RETURN VALUEOn success, these functions return the natural logarithm of (1 + x). If x is a NaN, a NaN is returned. If x is positive infinity, positive infinity is returned. If x is −1, a pole error occurs, and the functions return −HUGE_VAL, −HUGE_VALF, or −HUGE_VALL, respectively. If x is less than −1 (including negative infinity), a domain error occurs, and a NaN (not a number) is returned.
ERRORSSee math_error(7) for information on how to determine whether an error has occurred when calling these functions. The following errors can occur: Domain error: x is less than −1 errno is set to EDOM (but see BUGS). An invalid floating-point exception (FE_INVALID) is raised. Pole error: x is −1 errno is set to ERANGE (but see BUGS). A divide-by-zero floating-point exception (FE_DIVBYZERO) is raised.
ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7). InterfaceAttributeValue log1p(), log1pf(), log1pl() Thread safetyMT-Safe
STANDARDSC99, POSIX.1-2001, POSIX.1-2008.
BUGSBefore glibc 2.22, the glibc implementation did not set errno to EDOM when a domain error occurred. Before glibc 2.22, the glibc implementation did not set errno to ERANGE when a range error occurred.
SEE ALSOexp(3), expm1(3), log(3) 0
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