[R] For the record: how to merge data frames vertically
Prof Brian D Ripley
ripley at stats.ox.ac.uk
Thu Mar 9 10:15:05 CET 2000
On Thu, 9 Mar 2000, Kaspar Pflugshaupt wrote:
> to save searching time in the S-news archive, here is the simple solution to
> merge data frames vertically (cols must be equivalent, of course). The
To avoid confusion, that is not the usual meaning of `merge', but
of concatenate, say.
> frames must be components of a list, such as produced by
> # posted to S-news by Bill Venables, found in summary message
> The result is identical to bigframe with the exception of the rownames.
> Those seem to be generated by pasting the respective component name and each
> rowname (maybe to prevent non-unique rownames?). To keep rownames, I use
> Now, all I wonder is, why does this solution work and "rbind(framelist)"
> does not? (gives "Error in rbind(...) : cannot create a matrix from these
> types"). To my untrained eye, the two look identical...
In rbind(framelist) the argument is a single list. do.call creates a call
in which framelist is mapped to several arguments.
There seems to be a lack of clarity in what cbind and rbind do, and I have
expanded the help page for the next patch release.
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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