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GNU/Linux man pages

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GNU/Linux	CentOS 5.2
	log1pl(3)

LOG1P

log1p − logarithm of 1 plus argument

#include <math.h>

double log1p(double x);
float log1pf(float x);
long double log1pl(long double x);

Compile with −std=c99; link with −lm.

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.