betax betaxc ibeta ibetac ibetaci ibetacia ibetacib ibetad ibetai ibetaia ibetaib

ibetad() double ibetad ( double  a, double  b, double  x  ) Derivative of normalized incomplete beta function Ix(a, b) Purpose ibetad computes the partial derivative with respect to x of the normalized incomplete beta function Ix(a, b). d/dx Ix(a, b) = (1 - x)^(b - 1)*x^(a - 1)/B(a, b) Returns Partial derivative with respect to x of Ix(a, b). Parameters [in] a Argument a. (a > 0) [in] b Argument b. (b > 0) [in] x Argument x. (0 <= x <= 1) Error handling If a <= 0, b <= 0, x < 0 or x > 1, domain error (EDOM) occurs. Range error (ERANGE) may occur. Reference boost/math/special_functions