gammai gammaic gammait gammap gammapd gammapi gammapia gammaq gammaqi gammaqia

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