[Rd] Putting an object in a data farme
Prof Brian Ripley
ripley at stats.ox.ac.uk
Tue Jun 24 18:50:08 MEST 2003
On Tue, 24 Jun 2003, Duncan Murdoch wrote:
>
> I'd like to use the modelling functions, in particular model.frame,
> with the S4 orientation objects I'm writing.
That's probably not a good idea: I gave up for S-PLUS with S4 classes a
long time back. Too many utilities assumed that a classed object was a
list with components like call and formula.
> However, these use
> data.frames, and data.frames object to having my objects put in them.
> model.frame checks the mode of the object before it puts it in;
> data.frame seems to be trying to coerce my class to data.frame, and
> it's failing.
>
> What's necessary to put a nonstandard object into a data.frame?
You need either to enclose it in I() or write an as.data.frame method for
it, which may be difficult if it does not have an S3 class.
Brian
--
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
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