From jerry.lewis at biogenidec.com  Fri Oct 23 05:55:26 2009
From: jerry.lewis at biogenidec.com (jerry.lewis at biogenidec.com)
Date: Fri, 23 Oct 2009 05:55:26 +0200 (CEST)
Subject: [Rd] (PR#14020) trigamma for very large arguments
Message-ID: <20091023035526.D5C0D282EF3D@mail.pubhealth.ku.dk>

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
  (-1)^(deriv-1)*factorial(deriv-1)/x^deriv
whenever deriv>=1 and x>=1e15
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[Rd] (PR#14020) trigamma for very large arguments
jerry.lewis at biogenidec.com