Re: [Rd] Bug in rnorm? (PR#12016)

From: ONKELINX, Thierry <Thierry.ONKELINX_at_inbo.be>
Date: Thu, 07 Aug 2008 11:49:51 +0200

That's not a bug. It's FAQ 7.31

Thierry




ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature and Forest
Cel biometrie, methodologie en kwaliteitszorg / Section biometrics, methodology and quality assurance
Gaverstraat 4
9500 Geraardsbergen
Belgium
tel. + 32 54/436 185
Thierry.Onkelinx_at_inbo.be
www.inbo.be

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~ Sir Ronald Aylmer Fisher

The plural of anecdote is not data.
~ Roger Brinner

The combination of some data and an aching desire for an answer does not ensure that a reasonable answer can be extracted from a given body of data.
~ John Tukey

-----Oorspronkelijk bericht-----
Van: r-devel-bounces_at_r-project.org
[mailto:r-devel-bounces_at_r-project.org] Namens paul.eckermann_at_adelaide.edu.au
Verzonden: donderdag 7 augustus 2008 11:33 Aan: r-devel_at_stat.math.ethz.ch
CC: R-bugs_at_biostat.ku.dk
Onderwerp: [Rd] Bug in rnorm? (PR#12016)

Full_Name: Paul Eckermann
Version: 2.7.1
OS: Windows XP Service Pack 2
Submission from: (NULL) (129.127.183.12)

This is the first time I have submitted a bug report, so apologies if I have not
followed the correct protocol.

If I enter

length(rnorm(100*.29))

it returns 28 rather than 29.

y<-(1:100)/100
z<-sapply(y,function(x) length(rnorm(x*100))) z!=100*y

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.

Regards,
Paul Eckermann



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