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

tgamma1pm1() double tgamma1pm1 ( double  x ) Gamma function Γ(1+x) - 1 Purpose tgamma1pm1 computes the gamma function Γ(1+x) - 1 accurately in the sense of relative error when x is very small. Returns Gamma function Γ(1+x) - 1. Parameters [in] x Argument x. (x != negative integer) Error handling If x is an negative integer, domain error (EDOM) occurs. Range error (ERANGE) may occur. Reference boost/math/special_functions