[unix-history] / usr / man / man3 / gamma.3m

.TH GAMMA 3M  "19 January 1983"
.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 = exp(y);
	if(signgam)
		y = \-y;
.fi
.SH DIAGNOSTICS
A huge value is returned for negative integer arguments.
.SH BUGS
There should be a positive indication of error.
Commit	Line	Data
05dda90f C	1	.TH GAMMA 3M "19 January 1983"
	2	.SH NAME
	3	gamma \- log gamma function
	4	.SH SYNOPSIS
	5	.nf
	6	.B #include <math.h>
	7	.PP
	8	.B double gamma(x)
	9	.B double x;
	10	.fi
	11	.SH DESCRIPTION
	12	.I Gamma
	13	returns ln \\|\|\\|\(*G(\\|\|\\|\fIx\fR\\|\|\\|)\\|\|\\|.
	14	The sign of \(*G(\\|\|\\|\fIx\fR\\|\|\\|) is returned in the external integer
	15	.IR signgam .
	16	The following C program might be used to calculate \(*G:
	17	.PP
	18	.nf
	19	y = gamma(x);
	20	if (y > 88.0)
	21	error();
	22	y = exp(y);
	23	if(signgam)
	24	y = \-y;
	25	.fi
	26	.SH DIAGNOSTICS
	27	A huge value is returned for negative integer arguments.
	28	.SH BUGS
	29	There should be a positive indication of error.