EXPM1(3) Linux Programmer's Manual EXPM1(3)
**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 inac-
curate 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)
GNU September 16, 1995 1