Section : 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_SOURCEDESCRIPTIONThese 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).
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 Johanes Gumabo Data Size : 11,248 byte man-log1pl.3Build : 2025-03-22, 13:26 : Visitor Screen : x Visitor Counter ( page / site ) : 34 / 2,299,390 Visitor ID : : Visitor IP : 216.73.217.6 : Visitor Provider : AMAZON-02 : Provider Position ( lat x lon ) : 39.962500 x -83.006100 : x Provider Accuracy Radius ( km ) : 20 : Provider City : Columbus : Provider Province : Ohio , : , Provider Country : United States : Provider Continent : North America : Visitor Recorder : Version : Visitor Recorder : Library : Online Linux Manual Page : Version : Online Linux Manual Page - Fedora.40 - march=x86-64 - mtune=generic - 25.03.22 Online Linux Manual Page : Library : lib_c - 24.10.03 - march=x86-64 - mtune=generic - Fedora.40 Online Linux Manual Page : Library : lib_m - 24.10.03 - march=x86-64 - mtune=generic - Fedora.40 Data Base : Version : Online Linux Manual Page Database - 24.04.13 - march=x86-64 - mtune=generic - fedora-38 Data Base : Library : lib_c - 23.02.07 - march=x86-64 - mtune=generic - fedora.36
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