digamma Function

public pure elemental function digamma(x) result(rst)

Computes the digamma function.

The digamma function is defined as: $$\psi(x) = \frac{d}{dx}\left( \ln \left( \Gamma \left( x \right) \right) \right)$$

See Also

• Wikipedia

Arguments

Type	Intent	Optional	Attributes		Name
real(kind=real64),	intent(in)			::	x	The value at which to evaluate the function.

Return Value real(kind=real64)

The function value.

Contents