WorksheetFunction.GammaLn(Double) Method

Reference

Definition

Namespace:: Microsoft.Office.Interop.Excel

Assembly:: Microsoft.Office.Interop.Excel.dll

Important

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Returns the natural logarithm of the gamma function, Γ(x).

public:
 double GammaLn(double Arg1);

public double GammaLn (double Arg1);

Public Function GammaLn (Arg1 As Double) As Double

Parameters

Arg1: Double

X - the value for which you want to calculate GAMMALN.

Returns

Double

Remarks

Important: This function has been replaced with one or more new functions that may provide improved accuracy and whose names better reflect their usage. This function is still available for compatibility with earlier versions of Excel. However, if backward compatibility is not required, you should consider using the new functions from now on, because they more accurately describe their functionality. For more information about the new function, see the GammaLn_Precise(Double) method.

If x is nonnumeric, GammaLn returns the #VALUE! error value.

If x ≤ 0, GammaLn returns the #NUM! error value.

The number e raised to the GAMMALN(i) power, where i is an integer, returns the same result as (i - 1)!.

GammaLn is calculated as follows:

Figure 1: Equation for the GammaLn method

Where:

Figure 2: Equation

Applies to