AdvancedMathLogPochhammer Method

public static double LogPochhammer(
	double x,
	double y
)

Public Shared Function LogPochhammer ( 
	x As Double,
	y As Double
) As Double

public:
static double LogPochhammer(
	double x, 
	double y
)

static member LogPochhammer : 
        x : float * 
        y : float -> float 

Parameters

x  Double

The value of the base argument, which must be non-negative.

y  Double

The value of the exponent argument, which must be greater than or equal to -x.

Return Value

While Pochhammer(Double, Double) does not overflow for much of the parameter space for which Gamma(Double) of x or (x + y) would, there are still areas of parameter space for which it does. Additionally, for small y, Pochhammer(Double, Double) can be 1 to within floating-point accuracy, but you may still want to be able to quantify how much it differs from 1. This method overcomes both of those limitations by providing a non-overflowing value of the logarithm of the Pochammer symbol over its entire parameter space.

Reference