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wrappeddataframe
2007 Jan 24
1
how to properly extend s3 data.frames with s4 classes?
...n reported yet.
Summary
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(a) When extending a S3 data.frame with a S4 class adding a slot, it
seems to be impossible to initialize objects of these
"ExtendedDataframes" (XDF) with S3 data.frames.
(b) Extending data.frames with an S4 class without a slot, i.e. creating
a "WrappedDataframe" (WDF), seems to allow initialization with a
data.frame, but the behaviour appears to be somewhat inconsistent.
(c) Trying to be "smart" by extending the WrappedDataframe from (b) by
adding a slot, yields a similar behaviour than (a), i.e. initialization
with a WDF object fails...