log1p

Sommaire

NAME

log1p - logarithm of 1 plus argument

SYNOPSIS

 #include <math.h>
 
 double log1p(double x);
 
 float log1pf(float x);
 
 long double log1pl(long double x);
Compile with -std=c99; link with -lm.

DESCRIPTION

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, C99. The float and long double variants are C99 requirements.

SEE ALSO

exp(3), expm1(3), log(3)