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

Lngams_sub() Sub Lngams_sub ( Ret As  Double, X As  Double, Sign As  Long, Optional Info As  Long  ) Logarithm of gamma function ln|Γ(x)| and sign of gamma function (Subroutine version) Purpose Computes the logarithm of the gamma function ln|Γ(x)| at x, where x is not 0, -1, -2, ..., and the sign of the gamma function Γ(x). Parameters [out] Ret Logarithm of the gamma function ln|Γ(x)|. [in] X Argument x (X <> 0 and X <> negative integer) (If X < 0, computes the real part = ln(|Γ(X)|)) [out] Sign Sign of gamma function. = -1: Negative. = 1: Positive. [out] info = 0: Successful exit. = -1: The argument X had an illegal value. (X = 0 or negative integer) = 1: Floating point range error. Reference boost/math/special_functions