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 man : tgamma(3) Command: man perldoc info search(apropos)   ```LGAMMA(3) OpenBSD Programmer's Manual LGAMMA(3) NAME lgamma, lgammaf, tgamma, tgammaf - log gamma functions SYNOPSIS #include extern int signgam; double lgamma(double x); float lgammaf(float x); double tgamma(double x); float tgammaf(float x); DESCRIPTION lgamma(x) returns ln||(x)|. The external integer signgam returns the sign of |(x). The lgammaf() function is a single precision version of lgamma(). The tgamma(x) and tgammaf(x) functions return |(x), with no effect on signgam. IDIOSYNCRASIES 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. For arguments in its range, tgamma() is preferred, as for positive arguments it is accurate to within one unit in the last place. RETURN VALUES lgamma() returns appropriate values unless an argument is out of range. Overflow will occur for sufficiently large positive values, and non- positive integers. For large non-integer negative values, tgamma() will underflow. On the VAX, the reserved operator is returned, and errno is set to ERANGE. SEE ALSO infnan(3), math(3) STANDARDS The lgamma(), lgammaf(), tgamma(), and tgammaf() functions are expected to conform to ISO/IEC 9899:1999 (``ISO C99''). gamma() and gammaf() are deprecated aliases for lgamma() and lgammaf(), respectively. HISTORY The lgamma() function first appeared in 4.3BSD. The tgamma() function first appeared in OpenBSD 4.4, and is based on the gamma() function that appeared in 4.4BSD as a function to compute |(x). OpenBSD 4.9 June 12, 2008 OpenBSD 4.9 ```
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