_chu _hyp0f1 _hyp1f0 _hyp1f1 _hyp1f1r _hyp2f0 _hyp2f1 _lhyp1f1

_hyp2f1() double _hyp2f1 ( double  a1, double  a2, double  b, double  z  ) Hypergeometric function 2F1(a1, a2; b; z) (Gaussian hypergeometric function) Purpose hyp2f1 computes the hypergeometric function 2F1(a1, a2; b; z). 2F1(a1, a2; b; z) = Σ(a1)k*(a2)k/(b)k * z^k/k! (k = 1 to ∞) Returns 2F1(a1, a2; b; z). Parameters [in] a1 Argument a1. [in] a2 Argument a2. [in] b Argument b. [in] z Argument z. Error handling If z is outside the addressed range, domain error (EDOM) occurs. Range error (ERANGE) may occur. Notes z < -1 and z > 1 are not addressed except for some special cases. The parameters a1, a2 and b ranging from -1 to 7 are tested (-7 to 7 for some special cases). It is recommended to use within this range. The parameters a1, a2 and b are considered to be integer valued if they are within 1.0e-13 of the nearest integer. Reference netlib/cephes