public static double IntegralE(
	int n,
	double x
)

Public Shared Function IntegralE ( _
	n As Integer, _
	x As Double _
) As Double

public:
static double IntegralE(
	int n, 
	double x
)

static member IntegralE : 
        n : int * 
        x : float -> float 

Return Value

The exponential integral is defined as:

It is related to the incomplete Gamma function for negative, integer shape parameters by Γ(-k, x) = Ei_k+1(x) / x^k.

In hydrology, E₁(x) is sometimes called the Well function.