chi ci shi si

shi() double shi ( double  x ) Hyperbolic sine integral Shi(x) Purpose shi computes the hyperbolic sine integral. Shi(x) = ∫ sinh(t)/t dt [0, x] Returns info = 0: Hyperbolic sine integral Shi(x). info = 1: -∞. info = 2: ∞. Parameters [in] x Argument x. Error handling Range error (ERANGE) may occur.