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How about the following NEWS item (a bug fix)
o Assigning class "factor" to an object now requires it has
integer (and not say double) codes.
? (Changing the mode to double amounted to creating a new double vector
and then assigning the attributes of the old object including the class.
We gave a more specific error message in this case in an attempt to be
helpful ....)
>From ?factor
'factor' returns an object of class '"factor"' which has a set of
integer codes the length of 'x' with a '"levels"' attribute of
mode 'character'. If 'ordered' is true (or 'ordered' is used) the
result has class 'c("ordered", "factor")'.
So a factor necessarily has integer codes. That you were able to change
the mode in earlier versions of R was a bug that has been fixed.
You may well want one of the answers to FAQ 7.10.
Please take note of the 'BUGS' section in the FAQ and the posting guide:
three incorrect bug items in one day is unhelpful.
On Fri, 11 May 2007, [EMAIL PROTECTED] wrote:
> Full_Name: Frédéric Gosselin
> Version: 2.5 vs 2.4 and 2.2.1
> OS: windows XP
> Submission from: (NULL) (195.221.118.52)
>
>
> #############
> L3 <- LETTERS[1:3]
> (d <- data.frame(cbind(x=1, y=1:10), fac=as.factor(sample(L3, 10,
> repl=TRUE))))
> mode(d[,3])<-"numeric"
> ###############
>
> when trying to change the mode of a column in a data.frame that is a factor to
> numeric(cf. preceding code), the following error occurs (in French) in R 2.5:
>
> Erreur dans `storage.mode<-`(`*tmp*`, value = "double") :
> le mode de stockage d'un objet "factor" ne peut être modifié
>
> The same thing works fine in R2.4 and 2.2.1.
>
> It does not seem to correspond to new things announced in the NEWS file for
> the
> 2.5 version...
>
> ______________________________________________
> R-devel@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
>
--
Brian D. Ripley, [EMAIL PROTECTED]
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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