[R] t() converts data.frames ind matrix

ripley@stats.ox.ac.uk ripley at stats.ox.ac.uk
Tue Aug 20 21:19:18 CEST 2002

On Tue, 20 Aug 2002, Uwe Ligges wrote:

> Jan Malte Wiener wrote:
> >
> > hi,
> > i just recognized  that the t() function converts a data frames into a
> > matrix (R 1.5). is that a bug or a feature ?
> It's a feature. You cannot transpose a data.frames, so implicitly you
> convert the data.frame to a matrix and transpose that matrix! See code
> of t.data.frame().

The help page for R-devel (the next version of R-to-be) says so
explicitly, which may help users.

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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