Functions
Function	Cdigamma (Z As Complex, Optional Info As Long) As Complex
	Digamma (or psi) function ψ(z) (complex argument)

Function	Digamma (X As Double, Optional Info As Long) As Double
	Digamma (or psi) function ψ(x)

Function	Polygamma (X As Double, N As Long, Optional Info As Long) As Double
	Polygamma function ψn(x)

Function	Trigamma (X As Double, Optional Info As Long) As Double
	Trigamma function ψ1(x)

Detailed Description

This is the group of C7c. Polygamma functions.

Functions