EXPM1
Section: Linux Programmer's Manual (3)
Updated: September 16, 1995
NAME
expm1, log1p - exponential minus 1, logarithm of 1 plus argument
SYNOPSIS
#include <math.h>
double expm1 ( double x );
double log1p ( double x );
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
zero--a case where `exp (x) - 1' would be inaccurate due to
subtraction of two numbers that are nearly equal.
log1p(x)
returns a value equivalent to `log (1 + x)'. It is computed in a way
that is accurate even if the value of x is near zero.
CONFORMING TO
BSD
SEE ALSO
exp(3), log(3)