[Rd] Bug in rnorm? (PR#12016)
Prof Brian Ripley
ripley at stats.ox.ac.uk
Thu Aug 7 11:47:03 CEST 2008
Try printing floor(100*.29): you have forgotten about representation
>From the help page:
n: number of observations. If 'length(n) > 1', the length is
taken to be the number required.
and you asked for (just) less than 29 observations, and got what you asked
On Thu, 7 Aug 2008, paul.eckermann at adelaide.edu.au wrote:
> Full_Name: Paul Eckermann
> Version: 2.7.1
> OS: Windows XP Service Pack 2
> Submission from: (NULL) (184.108.40.206)
> This is the first time I have submitted a bug report, so apologies if I have not
> followed the correct protocol.
> If I enter
> it returns 28 rather than 29.
> z<-sapply(y,function(x) length(rnorm(x*100)))
> indicates that it has something to do with multiples of 7 (rounding error?),
> even though 29, 57 and 58 are the 3 values for which it returns incorrect values
> of z.
> I hope that this is not something obvious that I have missed. This can
> be overcome by doing the x*100 calculation outside the rnorm function,
> but I don't see why this needs to be done when the answer is (supposed
> to be) an integer.
Supposed by whom?
> Paul Eckermann
> R-devel at r-project.org mailing list
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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