log1pl.3.gz

LOG1P

log1p - logarithm of 1 plus argument

#include <math.h>
 I double log1p(double  x );

I float log1pf(float  x );

I long double log1pl(long double  x );

Compile with -std=c99; link with -lm.

I 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.

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