[Rd] (PR#14020) trigamma for very large arguments

jerry.lewis at biogenidec.com jerry.lewis at biogenidec.com
Fri Oct 23 05:55:26 CEST 2009

More generally, the accuracy and working range of psigamma(x,deriv) can be 
improved by having it return the leading term of the asymptotic expansion
whenever deriv>=1 and x>=1e15
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