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RocketLink!--> Man page versions: OpenBSD FreeBSD RedHat Others

LGAMMA(3)                 OpenBSD Programmer's Manual                LGAMMA(3)

     lgamma, lgammaf - log gamma functions

     #include <math.h>

     extern int signgam;

     lgamma(double x);

     lgammaf(float x);

DESCRIPTION                _
     lgamma(x) returns ln|| (x)|.
     The external integer signgam returns the sign of | (x).

     Do not use the expression ``signgam*exp(lgamma(x))'' to compute g :=
     | (x).  Instead use a program like this (in C):

           lg = lgamma(x); g = signgam*exp(lg);

     Only after lgamma() has returned can signgam be correct.

     lgamma() returns appropriate values unless an argument is out of range.
     Overflow will occur for sufficiently large positive values, and non-posi-
     tive integers.  On the VAX, the reserved operator is returned, and errno
     is set to ERANGE.

     infnan(3),  math(3)

     The lgamma() function appeared in 4.3BSD.

OpenBSD 2.6                    December 3, 1992                              1

Source: OpenBSD 2.6 man pages. Copyright: Portions are copyrighted by BERKELEY
SOFTWARE DESIGN, INC., The Regents of the University of California, Massachusetts
Institute of Technology, Free Software Foundation, FreeBSD Inc., and others.

(Corrections, notes, and links courtesy of RocketAware.com)

[Detailed Topics]
FreeBSD Sources for lgamma(3) functions
FreeBSD Sources for lgamma(3) functions
OpenBSD sources for lgamma(3)

[Overview Topics]

Up to: Floating point math - Floating point math (including complex numbers)

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