WE_1 WEi WEn WLi WSpence

WEn() Function WEn ( X As  Double, N As  Long, Optional Kode As  Long = 1  ) Exponential integral En(x) Purpose WEn computes the exponential integrals En(x) for nonnegative argument x. En(x) = ∫ exp(-xt)/t^n dt [1, ∞] Returns Exponential integral En(x). Parameters [in] X Argument x. (X >= 0) [in] N Order of the exponential integral n. (N >= 0) [in] Kode (Optional) Scaling option parameter. (default = 1) = 1: No scaling. (For other parameter values, the default value will be used except that Kode = 2 causes #VALUE! error) Reference boost/math/special_functions