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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-15 19:40:15 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-15 19:40:15 +0000 |
commit | 399644e47874bff147afb19c89228901ac39340e (patch) | |
tree | 1c4c0b733f4c16b5783b41bebb19194a9ef62ad1 /man3/gamma.3 | |
parent | Initial commit. (diff) | |
download | manpages-399644e47874bff147afb19c89228901ac39340e.tar.xz manpages-399644e47874bff147afb19c89228901ac39340e.zip |
Adding upstream version 6.05.01.upstream/6.05.01
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'man3/gamma.3')
-rw-r--r-- | man3/gamma.3 | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/man3/gamma.3 b/man3/gamma.3 new file mode 100644 index 0000000..2dc9075 --- /dev/null +++ b/man3/gamma.3 @@ -0,0 +1,122 @@ +'\" t +.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de) +.\" +.\" SPDX-License-Identifier: GPL-1.0-or-later +.\" +.\" Modified 2003-11-18, aeb: historical remarks +.\" +.TH gamma 3 2023-07-20 "Linux man-pages 6.05.01" +.SH NAME +gamma, gammaf, gammal \- (logarithm of the) gamma function +.SH LIBRARY +Math library +.RI ( libm ", " \-lm ) +.SH SYNOPSIS +.nf +.B #include <math.h> +.PP +.BI "[[deprecated]] double gamma(double " x ");" +.BI "[[deprecated]] float gammaf(float " x ");" +.BI "[[deprecated]] long double gammal(long double " x ");" +.fi +.PP +.RS -4 +Feature Test Macro Requirements for glibc (see +.BR feature_test_macros (7)): +.RE +.PP +.BR gamma (): +.nf + _XOPEN_SOURCE + || /* Since glibc 2.19: */ _DEFAULT_SOURCE + || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE +.fi +.PP +.BR gammaf (), +.BR gammal (): +.nf + _XOPEN_SOURCE >= 600 || (_XOPEN_SOURCE && _ISOC99_SOURCE) + || /* Since glibc 2.19: */ _DEFAULT_SOURCE + || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE +.fi +.SH DESCRIPTION +These functions are deprecated: instead, use either the +.BR tgamma (3) +or the +.BR lgamma (3) +functions, as appropriate. +.PP +For the definition of the Gamma function, see +.BR tgamma (3). +.SS *BSD version +The libm in 4.4BSD and some versions of FreeBSD had a +.BR gamma () +function that computes the Gamma function, as one would expect. +.SS glibc version +glibc has a +.BR gamma () +function that is equivalent to +.BR lgamma (3) +and computes the natural logarithm of the Gamma function. +.SH RETURN VALUE +See +.BR lgamma (3). +.SH ERRORS +See +.BR lgamma (3). +.SH ATTRIBUTES +For an explanation of the terms used in this section, see +.BR attributes (7). +.TS +allbox; +lbx lb lb +l l l. +Interface Attribute Value +T{ +.na +.nh +.BR gamma (), +.BR gammaf (), +.BR gammal () +T} Thread safety MT-Unsafe race:signgam +.TE +.sp 1 +.SH STANDARDS +None. +.SH HISTORY +SVID 2. +.PP +Because of historical variations in behavior across systems, +this function is not specified in any recent standard. +.PP +4.2BSD had a +.BR gamma () +that computed +.RI ln(|Gamma(| x |)|), +leaving the sign of +.RI Gamma(| x |) +in the external integer +.IR signgam . +In 4.3BSD the name was changed to +.BR lgamma (3), +and the man page promises +.PP +.in +4n +"At some time in the future the name gamma will be rehabilitated +and used for the Gamma function" +.in +.PP +This did indeed happen in 4.4BSD, where +.BR gamma () +computes the Gamma function (with no effect on +.IR signgam ). +However, this came too late, and we now have +.BR tgamma (3), +the "true gamma" function. +.\" The FreeBSD man page says about gamma() that it is like lgamma() +.\" except that is does not set signgam. +.\" Also, that 4.4BSD has a gamma() that computes the true gamma function. +.SH SEE ALSO +.BR lgamma (3), +.BR signgam (3), +.BR tgamma (3) |