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LGAMMA(3) Linux Programmer's Manual LGAMMA(3)

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)
June 25, 1993 BSD