AdvancedMathPsi Method (Double)

public static double Psi(
	double x
)

Public Shared Function Psi ( 
	x As Double
) As Double

public:
static double Psi(
	double x
)

static member Psi : 
        x : float -> float 

Parameters

x

Type: SystemDouble
The argument.

Return Value

The psi function, also called the digamma function, is the logrithmic derivative of the Γ function.

Because it is defined as a logarithmic derivative, the digamma function does not overflow Double even for arguments for which Gamma(Double) does.

To evaluate the psi function for complex arguments, use Psi(Complex).

Reference

Other Resources