lgamma.3 (457f6cd2d6a252c742a247d30d8483a2a8f7d8e7) lgamma.3 (3892c30012a1d0e8e63be132db3149782c2b711a)
1.\" Copyright (c) 1985, 1991 Regents of the University of California.
2.\" All rights reserved.
3.\"
4.\" Redistribution and use in source and binary forms, with or without
5.\" modification, are permitted provided that the following conditions
6.\" are met:
7.\" 1. Redistributions of source code must retain the above copyright
8.\" notice, this list of conditions and the following disclaimer.

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51.Sh SYNOPSIS
52.In math.h
53.Ft extern int
54.Fa signgam ;
55.sp
56.Ft double
57.Fn lgamma "double x"
58.Ft double
1.\" Copyright (c) 1985, 1991 Regents of the University of California.
2.\" All rights reserved.
3.\"
4.\" Redistribution and use in source and binary forms, with or without
5.\" modification, are permitted provided that the following conditions
6.\" are met:
7.\" 1. Redistributions of source code must retain the above copyright
8.\" notice, this list of conditions and the following disclaimer.

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51.Sh SYNOPSIS
52.In math.h
53.Ft extern int
54.Fa signgam ;
55.sp
56.Ft double
57.Fn lgamma "double x"
58.Ft double
59.Fn lgamma_r "double x, int *signgamp"
59.Fn lgamma_r "double x" "int *signgamp"
60.Ft float
61.Fn lgammaf "float x"
62.Ft float
60.Ft float
61.Fn lgammaf "float x"
62.Ft float
63.Fn lgammaf_r "float x, int *signgamp"
63.Fn lgammaf_r "float x" "int *signgamp"
64.Ft double
65.Fn gamma "double x"
66.Ft double
64.Ft double
65.Fn gamma "double x"
66.Ft double
67.Fn gamma_r "double x, int *signgamp"
67.Fn gamma_r "double x" "int *signgamp"
68.Ft float
69.Fn gammaf "float x"
70.Ft float
68.Ft float
69.Fn gammaf "float x"
70.Ft float
71.Fn gammaf_r "float x, int *signgamp"
71.Fn gammaf_r "float x" "int *signgamp"
72.Ft double
73.Fn tgamma "double x"
74.Sh DESCRIPTION
75.Fn lgamma x
76and
77.Fn lgammaf x
78.if t \{\
79return ln\||\(*G(x)| where

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92.Pp
93.Fn lgamma_r x signgamp
94and
95.Fn lgammaf_r x signgamp
96provide the same functionality as
97.Fn lgamma x
98and
99.Fn lgammaf x
72.Ft double
73.Fn tgamma "double x"
74.Sh DESCRIPTION
75.Fn lgamma x
76and
77.Fn lgammaf x
78.if t \{\
79return ln\||\(*G(x)| where

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92.Pp
93.Fn lgamma_r x signgamp
94and
95.Fn lgammaf_r x signgamp
96provide the same functionality as
97.Fn lgamma x
98and
99.Fn lgammaf x
100but the caller must provide an integer to store the sign of \(*G(x)
100but the caller must provide an integer to store the sign of \(*G(x).
101.Pp
102.Fn gamma ,
103.Fn gammaf ,
104.Fn gamma_r ,
105and
106.Fn gammaf_r
107are deprecated aliases for
108.Fn lgamma ,

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133.Fn tgamma
134is preferred, as for positive arguments
135it is accurate to within one unit in the last place.
136Exponentiation of
137.Fn lgamma
138will lose up to 10 significant bits.
139.Sh RETURN VALUES
140.Fn gamma ,
101.Pp
102.Fn gamma ,
103.Fn gammaf ,
104.Fn gamma_r ,
105and
106.Fn gammaf_r
107are deprecated aliases for
108.Fn lgamma ,

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133.Fn tgamma
134is preferred, as for positive arguments
135it is accurate to within one unit in the last place.
136Exponentiation of
137.Fn lgamma
138will lose up to 10 significant bits.
139.Sh RETURN VALUES
140.Fn gamma ,
141.Fn gamma_r,
141.Fn gamma_r ,
142.Fn gammaf ,
143.Fn gammaf_r ,
144.Fn lgamma ,
145.Fn lgamma_r ,
142.Fn gammaf ,
143.Fn gammaf_r ,
144.Fn lgamma ,
145.Fn lgamma_r ,
146.Fn lgammaf,
146.Fn lgammaf ,
147and
148.Fn lgammaf_r
149return appropriate values unless an argument is out of range.
150Overflow will occur for sufficiently large positive values, and
151non-positive integers.
152On the
153.Tn VAX ,
154the reserved operator is returned,

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148.Fn lgammaf_r
149return appropriate values unless an argument is out of range.
150Overflow will occur for sufficiently large positive values, and
151non-positive integers.
152On the
153.Tn VAX ,
154the reserved operator is returned,

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