.TH GAMMA 2
.SH NAME
gamma \- log gamma function
.SH SYNOPSIS
.ta \w'\fLdouble 'u
.B
double	gamma(double x)
.PP
.B
int	signgam;
.SH DESCRIPTION
.I Gamma
returns
ln |\(*G(\|\fIx\fP\|)|.
The sign of
\(*G(\|\fIx\fP\|)
is returned in the external integer
.IR signgam .
.SH EXAMPLES
Computation of the gamma function:
.PP
.nf
.ta 8n +8n
.ft L
	errno = 0;
	y = gamma(x);
	if(errno || y > 88)
		error();
	y = signgam*exp(y);
.fi
.ft P
.SH SEE ALSO
.IR intro (2)