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gammait() double gammait ( double  a, double  x  ) Tricomi's incomplete gamma function γ*(a, x) Purpose gammait computes the Tricomi's incomplete gamma function γ*(a, x). γ*(a, x) = x^(-a)/Γ(a)*γ(a, x) Returns Tricomi's incomplete gamma function γ*(a, x). Parameters [in] a Argument a. [in] x Argument x. (x >= 0) Error handling If x < 0, domain error (EDOM) occurs. Range error (ERANGE) may occur.