+++ /dev/null
-.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
-.\" and Copyright 2008, Linux Foundation, written by Michael Kerrisk
-.\" <mtk.manpages@gmail.com>
-.\"
-.\" %%%LICENSE_START(GPL_NOVERSION_ONELINE)
-.\" Distributed under GPL
-.\" %%%LICENSE_END
-.\"
-.\" based on glibc infopages
-.\"
-.TH LGAMMA 3 2014-01-18 "" "Linux Programmer's Manual"
-.SH NAME
-lgamma, lgammaf, lgammal, lgamma_r, lgammaf_r, lgammal_r, signgam \-
-log gamma function
-.SH SYNOPSIS
-.nf
-.B #include <math.h>
-.sp
-.BI "double lgamma(double " x );
-.br
-.BI "float lgammaf(float " x );
-.br
-.BI "long double lgammal(long double " x );
-.sp
-.BI "double lgamma_r(double " x ", int *" signp );
-.br
-.BI "float lgammaf_r(float " x ", int *" signp );
-.br
-.BI "long double lgammal_r(long double " x ", int *" signp );
-.sp
-.BI "extern int " signgam ;
-.fi
-.sp
-Link with \fI\-lm\fP.
-.sp
-.in -4n
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.in
-.sp
-.ad l
-.BR lgamma ():
-.RS 4
-_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE || _ISOC99_SOURCE ||
-_POSIX_C_SOURCE\ >=\ 200112L;
-.br
-or
-.I cc\ -std=c99
-.RE
-.br
-.BR lgammaf (),
-.BR lgammal ():
-.RS 4
-_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE\ >=\ 600 || _ISOC99_SOURCE ||
-_POSIX_C_SOURCE\ >=\ 200112L;
-.br
-or
-.I cc\ -std=c99
-.RE
-.BR lgamma_r (),
-.BR lgammaf_r (),
-.BR lgammal_r ():
-.RS 4
-_BSD_SOURCE || _SVID_SOURCE
-.RE
-.IR signgam :
-.RS 4
-_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE
-.RE
-.ad b
-.SH DESCRIPTION
-For the definition of the Gamma function, see
-.BR tgamma (3).
-.PP
-The
-.BR lgamma ()
-function returns the natural logarithm of
-the absolute value of the Gamma function.
-The sign of the Gamma function is returned in the
-external integer
-.I signgam
-declared in
-.IR <math.h> .
-It is 1 when the Gamma function is positive or zero, \-1
-when it is negative.
-.PP
-Since using a constant location
-.I signgam
-is not thread-safe, the functions
-.BR lgamma_r (),
-.BR lgammaf_r (),
-and
-.BR lgammal_r ()
-have been introduced; they return the sign via the argument
-.IR signp .
-.SH RETURN VALUE
-On success, these functions return the natural logarithm of Gamma(x).
-
-If
-.I x
-is a NaN, a NaN is returned.
-
-If
-.I x
-is 1 or 2, +0 is returned.
-
-If
-.I x
-is positive infinity or negative infinity,
-positive infinity is returned.
-
-If
-.I x
-is a nonpositive integer,
-a pole error occurs,
-and the functions return
-.RB + HUGE_VAL ,
-.RB + HUGE_VALF ,
-or
-.RB + HUGE_VALL ,
-respectively.
-
-If the result overflows,
-a range error occurs,
-.\" e.g., lgamma(DBL_MAX)
-and the functions return
-.BR HUGE_VAL ,
-.BR HUGE_VALF ,
-or
-.BR HUGE_VALL ,
-respectively, with the correct mathematical sign.
-.SH ERRORS
-See
-.BR math_error (7)
-for information on how to determine whether an error has occurred
-when calling these functions.
-.PP
-The following errors can occur:
-.TP
-Pole error: \fIx\fP is a nonpositive integer
-.I errno
-is set to
-.BR ERANGE
-(but see BUGS).
-A divide-by-zero floating-point exception
-.RB ( FE_DIVBYZERO )
-is raised.
-.TP
-Range error: result overflow
-.I errno
-is set to
-.BR ERANGE .
-An overflow floating-point exception
-.RB ( FE_OVERFLOW )
-is raised.
-.\" glibc (as at 2.8) also supports an inexact
-.\" exception for various cases.
-.SH CONFORMING TO
-The
-.BR lgamma ()
-functions are specified in C99 and POSIX.1-2001.
-.I signgam
-is specified in POSIX.1-2001, but not in C99.
-The
-.BR lgamma_r ()
-functions are nonstandard, but present on several other systems.
-.SH BUGS
-In glibc 2.9 and earlier,
-.\" http://sources.redhat.com/bugzilla/show_bug.cgi?id=6777
-when a pole error occurs,
-.I errno
-is set to
-.BR EDOM ;
-instead of the POSIX-mandated
-.BR ERANGE .
-Since version 2.10, glibc does the right thing.
-.SH SEE ALSO
-.BR tgamma (3)
-.SH COLOPHON
-This page is part of release 3.79 of the Linux
-.I man-pages
-project.
-A description of the project,
-information about reporting bugs,
-and the latest version of this page,
-can be found at
-\%http://www.kernel.org/doc/man\-pages/.
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