WChi WCi WShi WSi

WCi() Function WCi ( X As  Double ) Cosine integral Ci(x) Purpose WCi computes the cosine integral. Ci(x) = -∫ cos(t)/t dt [x, ∞] Returns Cosine integral Ci(x). (If x < 0, returns real part = Ci(|x|)) Parameters [in] X Argument x. (X <> 0)