GAMMA(3) Linux Programmer's Manual GAMMA(3)[top]NAMEgamma, gammaf, gammal - (logarithm of the) gamma functionSYNOPSIS#include <math.h> double gamma(double x); float gammaf(float x); long double gammal(long double x); Link withFeature Test Macro Requirements for glibc (see feature_test_macros(7)): gamma(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE gammaf(), gammal(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600-lm.DESCRIPTIONThese functions are deprecated: instead, use either the tgamma(3) or the lgamma(3) functions, as appropriate. For the definition of theGammafunction, see tgamma(3). *BSD version The libm in 4.4BSD and some versions of FreeBSD had a gamma() function that computes theGammafunction, as one would expect. glibc version Glibc has a gamma() function that is equivalent to lgamma(3) and com‐ putes the natural logarithm of theGammafunction.RETURN VALUESee lgamma(3).ERRORSSee lgamma(3).CONFORMING TOBecause of historical variations in behavior across systems, this func‐ tion is not specified in any standard.NOTESHistory 4.2BSD had a gamma() that computed ln(|Gamma(|x|)|), leaving the sign of Gamma(|x|) in the external integer signgam. In 4.3BSD the name was changed to lgamma(3), and the man page promises "At some time in the future the name gamma will be rehabilitated and used for theGammafunction" This did indeed happen in 4.4BSD, where gamma() computes theGammafunction (with no effect on signgam). However, this came too late, and we now have tgamma(3), the "true gamma" function.SEE ALSOlgamma(3), signgam(3), tgamma(3)COLOPHONThis page is part of release 3.65 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.GNU2008-08-05 GAMMA(3)

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