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SpecialDigammazeta_series Method

Evaluates digamma(z) near a simple root using a Taylor series whose coefficients are expressed via the Hurwitz zeta function.

Namespace: Altaxo.Calc
Assembly: AltaxoCore (in AltaxoCore.dll) Version: 4.8.3448.0 (4.8.3448.0)
Syntax
C#
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public static Complex zeta_series(
	Complex z,
	double root,
	double rootval
)

Parameters

z  Complex
The complex argument.
root  Double
An approximation of the (real) root location around which to expand.
rootval  Double
The precomputed value of digamma at root corresponding to the chosen floating-point approximation.

Return Value

Complex
The digamma function value at z.
See Also