gammai gammaic gammait gammap gammapd gammapi gammapia gammaq gammaqi gammaqia

gammaqi() double gammaqi ( double  a, double  q  ) Inverse function of x for normalized complementary incomplete gamma function Q(a, x) Purpose gammaqi computes the inverse function of x for normalized complementary incomplete gamma function Q(a, x). Returns Inverse function of x for normalized complementary incomplete gamma function Q(a, x). Parameters [in] a Argument a. (a > 0) [in] q Argument q. (0 <= q <= 1) Error handling If a <= 0, q < 0 or q > 1, domain error (EDOM) occurs. Range error (ERANGE) may occur. Reference boost/math/special_functions