WChu WHyp0f1 WHyp1f0 WHyp1f1 WHyp1f1r WHyp2f0 WHyp2f1 WLhyp1f1

WChu() Function WChu ( A As  Double, B As  Double, X As  Double  ) Confluent hypergeometric function U(a, b, x) Purpose This routine computes the confluent hypergeometric function U(a, b, x). U(a, b, x) = (1/Γ(x)) * ∫ exp(-xt)t^(a-1)(1+t)^(b-a-1) dt [0, ∞] Returns Confluent hypergeometric function U(a, b, x) Parameters [in] A Argument a. [in] B Argument b. [in] X Argument x. (X >= 0) Note This function is not valid if 1 + a - b is close to zero when x is small. Reference boost/math/special_functions