Functions
doublecomplex	cdigamma (doublecomplex z)
	Digamma (or psi) function ψ(z) (complex argument)

void	cdigamma_sub (doublecomplex z, doublecomplex *zout)
	Digamma (or psi) function ψ(z) (complex argument)

double	digamma (double x)
	Digamma (or psi) function ψ(x)

double	polygamma (int n, double x)
	Polygamma function ψn(x)

double	trigamma (double x)
	Trigamma function ψ1(x)

Detailed Description

This is the group of C7c. Polygamma functions.

Functions