gammai gammaic gammait gammap gammapd gammapi gammapia gammaq gammaqi gammaqia

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