Cgamma Cgamr Clngam Gamdratio Gamdratio_sub Gamma Gamma1pm1 Gamma1pm1_sub Gamr Gamr_sub Gamratio Gamratio_sub Lngam Lngam_sub Lngams Lngams_sub Poch Poch1 Poch1_sub Poch_sub

Gamma1pm1_sub() Sub Gamma1pm1_sub ( Ret As  Double, X As  Double, Optional Info As  Long  ) Gamma function Γ(1+x) - 1 (Subroutine version) Purpose Computes the gamma function Γ(1+x) - 1 accurately in the sense of relative error when x is very small. Parameters [out] Ret Gamma function Γ(1+x) - 1. [in] X Argument x. (X <> negative integer) [out] Info = 0: Successful exit. = -1: The argument X had an illegal value. (X is a negative integer) = 1: Floating point range error. Reference boost/math/special_functions