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Computes the Digamma function which is defined as the derivative of the log of the gamma function. The implementation is based on “Algorithm AS 103”, Jose Bernardo, Applied Statistics, Volume 25, Number 3 1976, pages 315 - 317
Computes the Digamma function which is defined as the derivative of the log of the gamma function. The implementation is based on “Algorithm AS 103”, Jose Bernardo, Applied Statistics, Volume 25, Number 3 1976, pages 315 - 317