Betax Betax_sub Betaxc Betaxc_sub Ibeta Ibeta_sub Ibetac Ibetac_sub Ibetaci Ibetaci_sub Ibetacia Ibetacia_sub Ibetacib Ibetacib_sub Ibetad Ibetad_sub Ibetai Ibetai_sub Ibetaia Ibetaia_sub Ibetaib Ibetaib_sub

Ibetad_sub() Sub Ibetad_sub ( Ret As  Double, A As  Double, B As  Double, X As  Double, Optional Info As  Long  ) Derivative of normalized incomplete beta function Ix(a, b) (Subroutine version) Purpose 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) Parameters [out] Ret Partial derivative with respect to x of Ix(a, b). [in] A Argument a. (A > 0) [in] B Argument b. (B > 0) [in] X Argument x. (0 <= X <= 1) [out] Info (Optional) = 0: Successful exit. = -1: The argument A had an illegal value. (A <= 0) = -2: The argument B had an illegal value. (B <= 0) = -3: The argument X had an illegal value. (X < 0 or X > 1) = 1: Floating point range error. Reference boost/math/special_functions