[Rd] zapsmall (PR#7755)
Prof Brian Ripley
ripley at stats.ox.ac.uk
Tue Mar 29 17:12:50 CEST 2005
On Tue, 29 Mar 2005 vosp at mail.ecu.edu wrote:
> Full_Name: Paul Vos
> Version: 2.0.1
> OS: windows XP
> Submission from: (NULL) (18.104.22.168)
>  -2.775558e-17
> This should be zero.
Why `should' it? The documentation says:
'zapsmall' determines a 'digits' argument 'dr' for calling
'round(x, digits = dr)' such that values "close to zero" (compared
with the maximal absolute one) are "zapped", i.e., treated as '0'.
That value is not small compared with the maximal absolute one: it is
equal to it.
Brian D. Ripley, ripley at 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 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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