cgamma cgamma_sub clgamma clgamma_sub crgamma crgamma_sub lgammas poch poch1 rgamma tgamma1pm1 tgammadratio tgammaratio

lgammas() double lgammas ( double  x, int *  sign  ) Logarithm of gamma function ln|Γ(x)| and sign of gamma function Purpose lgammas computes the logarithm of the gamma function ln|Γ(x)| at x, and the sign of the gamma function Γ(x). Returns Logarithm of the gamma function ln|Γ(x)|. Parameters [in] x Argument x. (x != negative integer, x != 0) [out] sign Sign of gamma function. = -1: Negative. = 1: Positive. Error handling If x is an negative integer or zero, inf is returned and range error (ERANGE) is reported. Other range error (ERANGE) may occur. Reference boost/math/special_functions