betax betaxc ibeta ibetac ibetaci ibetacia ibetacib ibetad ibetai ibetaia ibetaib

ibetai() double ibetai ( double  a, double  b, double  p, double *  py  ) Normalized incomplete beta function Ix(a, b) inverse for x Purpose ibetai returns a value x such that p = Ix(a, b), where p is the specified value of the normalized incomplete beta function. Returns Value of x. Parameters [in] a Argument a. (a > 0) [in] b Argument b. (b > 0) [in] p Specified value of normalized incomplete beta function. (0 <= p <= 1) [out] py Returne 1 - x. The value returned in py is free from cancellation errors. Even if ibetai returns 1, the value of py may be non-zero very small value. Error handling If a <= 0, b <= 0, p < 0 or p > 1, domain error (EDOM) occurs. Range error (ERANGE) may occur. Reference boost/math/special_functions