[Rd] gamma and lgamma functions (PR#684)
ripley@stats.ox.ac.uk
ripley@stats.ox.ac.uk
Wed, 4 Oct 2000 14:12:12 +0200 (MET DST)
> From: james.lindsey@luc.ac.be
> Date: Wed, 4 Oct 2000 13:59:14 +0200 (MET DST)
>
> The following seems very strange:
> > lgamma(-0.04)
> [1] 3.243307
> > gamma(-0.04)
> [1] -25.61830
> Jim
It is as documented, though: ?lgamma gives
The functions `gamma' and `lgamma' return the gamma function
Gamma(x) and the natural logarithm of the absolute value of the
^^^^^^^^^^^^^^^^^
gamma function.
and log(25.61830) = 3.243307.
It's not S-compatible, I grant.
--
Brian D. Ripley, ripley@stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272860 (secr)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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