expm1 - Online Linux Manual PageSection : 3
Updated : 2023-02-05
Source : Linux man-pages 6.03
NAMEexpm1, expm1f, expm1l − exponential minus 1
LIBRARYMath library (libm, −lm)
SYNOPSIS#include <math.h>double expm1(double x);
float expm1f(float x);
long double expm1l(long double x);Feature Test Macro Requirements for glibc (see feature_test_macros(7)): expm1(): _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
|| _XOPEN_SOURCE >= 500
|| /* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCEexpm1f(), expm1l(): _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 exp(x) − 1The result is computed in a way that is accurate even if the value of x is near zero—a case where exp(x) − 1" would be inaccurate due to subtraction of two numbers that are nearly equal.
RETURN VALUEOn success, these functions return exp(x) − 1. If x is a NaN, a NaN is returned. If x is +0 (−0), +0 (−0) is returned. If x is positive infinity, positive infinity is returned. If x is negative infinity, −1 is returned. If the result overflows, a range error occurs, and the functions return −HUGE_VAL, −HUGE_VALF, or −HUGE_VALL, respectively.
ERRORSSee math_error(7) for information on how to determine whether an error has occurred when calling these functions. The following errors can occur: Range error, overflow errno is set to ERANGE (but see BUGS). An overflow floating-point exception (FE_OVERFLOW) is raised.
ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7). InterfaceAttributeValue expm1(), expm1f(), expm1l() Thread safetyMT-Safe
STANDARDSC99, POSIX.1-2001, POSIX.1-2008.
BUGSBefore glibc 2.17, on certain architectures (e.g., x86, but not x86_64) expm1() raised a bogus underflow floating-point exception for some large negative x values (where the function result approaches −1). Before approximately glibc 2.11, expm1() raised a bogus invalid floating-point exception in addition to the expected overflow exception, and returned a NaN instead of positive infinity, for some large positive x values. Before glibc 2.11, the glibc implementation did not set errno to ERANGE when a range error occurred.
SEE ALSOexp(3), log(3), log1p(3) 0
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