E1 Ei En Li Spence

Spence() Function Spence ( X As  Double, Optional Info As  Long  ) Spence's function (dilogarithm) Li2(x) Purpose This routine computes a Spence's function (dilogarithm). Li2(x) = ∫ -ln(1-t)/t dt [0, x] Returns Double Spence's function Li2(x). Parameters [in] X Argument x. [out] Info (Optional) = 0: Successful exit. = 1: Floating point range error.