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)