AdvancedMathIntegralEi Method

public static double IntegralEi(
	double x
)

Public Shared Function IntegralEi ( 
	x As Double
) As Double

public:
static double IntegralEi(
	double x
)

static member IntegralEi : 
        x : float -> float 

Parameters

x  Double

The argument, which must be non-negative.

Return Value

The function Ei(x) appears in the evaluation of some indefinite integrals involving exponents and in number theory in the approximation li(x) = Ei(ln x) to the cumulative distribution of primes.

Ei(x) is related to the real part of E₁(x) for negative arguments by:

To compute Ei(z) in the entire complex plane, use Ein(Complex).

Reference

Other Resources