[R] Merge?

Prof Brian D Ripley ripley at stats.ox.ac.uk
Fri Feb 4 09:09:38 CET 2000

On Thu, 3 Feb 2000, R. Herold wrote:

> I see that feature freeze for a better than ever R has been announced. May I
> ask if there will be or could be "merge" function for data frames? I believe

Not for 0.99.0 due on Monday.

> it would be very nice if this were "centrally" implemented (with regard to
> my humble steps to writing such a function and the related error and other
> precautions). I know from VR2R.pdf (courtesy Profs. Venables and Ripley)
> that the "Functions crosstabs [...], by and merge [...] do not exist in R.",
> but perhaps someone can suggest such a merge function, just as a "by"
> function was suggested by Peter Dalgaard on 31. January?

VR2R.* was frozen last August and will not be updated (it complements an
obselete edition). VR3R.* is kept up to date.

Yes, versions of `by' and `merge' would be a good idea. We now have
`ftable' that does some of the crosstabs functionality.

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 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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