AdvancedMath.Psi Method (Double)
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AdvancedMathPsi Method (Double)

Computes the digamma function.

Namespace:  Meta.Numerics.Functions
Assembly:  Meta.Numerics (in Meta.Numerics.dll) Version: (
public static double Psi(
	double x


Type: SystemDouble
The argument.

Return Value

Type: Double
The value of ψ(x).

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).

See Also