Performance evaluation of programs related to the real gamma function

Authors:
W. J. Cody
Affiliations:
Argonne National Labs, Argonne, IL
Venue:
ACM Transactions on Mathematical Software (TOMS)
Year:
1991

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Abstract

Methods are presented for evaluating the performance of programs for the functions &Ggr;(x), ln &Ggr;(x), and &psgr;(x). Accuracy estimates are based on comparisons using the manipulation theorem. Ideas for checking robustness are also given, and details on specific implementations of test programs are included.