chu hyp0f1 hyp1f0 hyp1f1 hyp1f1r hyp2f0 hyppfq lhyp1f1

chu() double chu ( double  a, double  b, double  x  ) Confluent hypergeometric function U(a,b,x) Purpose chu 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) Error handling If x < 0, domain error (EDOM) occurs. Range error (ERANGE) may occur. Note This routine is not valid if 1 + a - b is close to zero when x is small.