gammai gammaic gammait gammap gammapd gammapi gammapia gammaq gammaqi gammaqia

gammapd() double gammapd ( double  a, double  x  ) Derivative of normalized incomplete gamma function P(a, x) Purpose gammapd computes the derivative of normalized incomplete gamma function P(a, x) with respect to x. d/dx P(a, x) = exp(-x)*x^(a-1)/Γ(a) Returns Derivative of normalized incomplete gamma function P(a, x) with respect to 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