[Rd] codes() has been deprecated
rpeng at stat.ucla.edu
Sun May 11 20:57:41 MEST 2003
I noticed on the developer's page under the notes for upgrading packages
for 1.8.0, it says:
coef() and coef<-() have been deprecated.
This should be codes() and codes<-(), no?
UCLA Department of Statistics
On Fri, 9 May 2003, Prof Brian Ripley wrote:
> We have deprecated codes() in R-devel. One we started looking into this,
> we found that *all* the uses of codes() in the R sources and probably all
> the uses in CRAN packages were not what we think was intended.
> For an ordered factor, codes() is the same as
> unclass/as.vector/as.integer and so was unneeded.
> For an unordered factor, codes() does *not* retrieve the internal codes.
> It effectively re-orders the levels into alphabetical order (in the
> current locale), forms a factor with those levels and then returns the
> internal codes. This is rarely what is wanted, as if the levels are not
> in alphabetical order this is normally reflects some other natural order
> and the function should normallyrecognize that. I normally use unclass()
> to get the internal codes, but as.vector and as.integer work equally well.
> R has a codes() replacement function that is also deprecated, and of which
> we can find no uses.
> Brian Ripley
> 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
> R-devel at stat.math.ethz.ch mailing list
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