[Rd] S4 objects in data frames?

From: Byron Ellis <byron.ellis_at_gmail.com>
Date: Wed, 19 Sep 2007 21:59:46 -0700


Is there any way to get S4 objects into a data frame and have the resulting data frame actually be printable?

After a good deal of work I managed to convert an S4 objects that holds several other objects into a data.frame object using a custom as.data.frame method, but I have been unable to discover how to make the result data.frame printable.

I've tried making format() generic, no dice. It eventually just wanders down the path to filter.default, which then tries to (incorrectly) unlist the contained S4 object. Obviously this doesn't work.

I can make a matrix of these objects without much trouble (there isn't a reasonable print function there either, but at least it doesn't error out).

Any clues? Someone who's managed to pull it off? I'm ready to do something horrible like create a wrapper class that extends character just to get it to work right, but this will be annoying for other reasons.

-- 
Byron Ellis (byron.ellis_at_gmail.com)
"Oook" -- The Librarian

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