gamma, gammaf, gammal - (logarithm of the) gamma function
#include <math.h> double gamma(double x); float gammaf(float x); long double gammal(long double x); Link with -lm. Feature Test Macro Requirements for glibc (see feature_test_macros(7)): gamma(): _XOPEN_SOURCE || /* Since glibc 2.19: */ _DEFAULT_SOURCE || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
_XOPEN_SOURCE >= 600 || (_XOPEN_SOURCE && _ISOC99_SOURCE) || /* Since glibc 2.19: */ _DEFAULT_SOURCE || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
For the definition of the Gamma function, see tgamma(3).
The libm in 4.4BSD and some versions of FreeBSD had a gamma() function that computes the Gamma function, as one would expect.
For an explanation of the terms used in this section, see attributes(7).
|gamma(), gammaf(), gammal()||Thread safety||MT-Unsafe race:signgam|
Because of historical variations in behavior across systems, this function is not specified in any recent standard. It was documented in SVID 2.
"At some time in the future the name gamma will be rehabilitated and used for the Gamma function"
This page is part of release 4.15 of the Linux
man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.