betax betaxc ibeta ibetac ibetaci ibetacia ibetacib ibetad ibetai ibetaia ibetaib

ibeta() double ibeta ( double  a, double  b, double  x  ) Normalized incomplete beta function Ix(a, b) Purpose ibeta computes the normalized incomplete beta function Ix(a, b) = (1/B(a, b))∫t^(a-1)*(1-t)^(b-1) dt [0, x] Returns Normalized incomplete beta function Ix(a, b). Parameters [in] a Argument a. (a >= 0, but a = b = 0 is not allowed) [in] b Argument b. (b >= 0, but a = b = 0 is not allowed) [in] x Argument x. (0 <= x <= 1) Error handling If a < 0, b < 0, a = b = 0, x < 0 or x > 1, domain error (EDOM) occurs. Range error (ERANGE) may occur. Reference boost/math/special_functions