logmdigamma

fnreal logmdigamma(real x)

Log Minus Digamma function

logmdigamma(x) = log(x) - digamma(x)

References:

  1. Abramowitz, M., and Stegun, I. A. (1970).

Handbook of mathematical functions. Dover, New York, pages 258-259, equations 6.3.6 and 6.3.18.