NAME¶

lgamma - log gamma function

SYNOPSIS¶

#include <math.h>

double lgamma(double x);

DESCRIPTION¶

The lgamma() function returns the log of the absolute value of the Gamma function. The sign of the Gamma function is returned in the external integer signgam.

For negative integer values of x, lgamma() returns HUGE_VAL and errno is set to ERANGE.

ERRORS¶

ERANGE

Invalid argument - negative integer value of x.

CONFORMING TO¶

SVID 3, BSD 4.3

SEE ALSO¶

infnan(3)