EXPM1(3) Linux Programmer's Manual EXPM1(3)
NAME
expm1, expm1f, expm1l  exponential minus 1
SYNOPSIS
#include <<math.h>>
double expm1(double x);
float expm1f(float x);
long double expm1l(long double x);
Link with lm.
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
expm1(), expm1f(), expm1l(): _BSD_SOURCE  _SVID_SOURCE 
_XOPEN_SOURCE >= 500  _ISOC99_SOURCE; or cc std=c99
DESCRIPTION
expm1(x) returns a value equivalent to
exp(x)  1
It is computed in a way that is accurate even if the value of x is near
zeroa case where exp(x)  1 would be inaccurate due to subtraction of
two numbers that are nearly equal.
CONFORMING TO
BSD, C99. The float and long double variants are C99 requirements.
SEE ALSO
exp(3), log(3), log1p(3)
COLOPHON
This page is part of release 3.05 of the Linux manpages project. A
description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/manpages/.
20070726 EXPM1(3)
