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gammaq() double gammaq ( double  a, double  x  ) Normalized complementary incomplete gamma function Q(a, x) Purpose gammaq computes the normalized complementary incomplete gamma function Q(a, x). Q(a, x) = Γ(a, x)/Γ(a) = (1/Γ(a))∫ t^(a-1)*exp(-t) dt [x, ∞] Returns Normalized complementary incomplete gamma function Q(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