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gammai() double gammai ( double  a, double  x  ) Incomplete gamma function γ(a, x) Purpose gammai computes the incomplete gamma function γ(a, x). γ(a, x) = ∫ t^(a-1)*exp(-t) dt [0, x] Returns Incomplete gamma function γ(a, x). Parameters [in] a Argument a. (a > 0) [in] x Argument x. (x >= 0) Error handling If a <= 0 or x < 0, domain error (EDOM) occurs. Range error (ERANGE) may occur. Reference boost/math/special_functions