V8/usr/man/man3/gamma.3

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.TH GAMMA 3M 
.SH NAME
gamma \- log gamma function
.SH SYNOPSIS
.nf
.B #include <math.h>
.PP
.B double gamma(x)
.B double x;
.fi
.SH DESCRIPTION
.I Gamma
returns
ln \(*G(\|\|\fIx\fR\|\|).
The sign of
\(*G(\|\|\fIx\fR\|\|)
is returned in the external integer
.IR signgam .
The following C program might be
used to calculate
\(*G:
.PP
.nf
	y = gamma(x);
	if (y > 88.0)
		error();
	y = signgam*exp(y);
.fi
.SH DIAGNOSTICS
A huge value is returned for negative integer arguments.
.SH BUGS
There should be a positive indication of error.