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valdity
2004 Aug 25
0
S3 classes in S4 class definitions
One of the changes some packages are noticing from the recent
modifications to methods is warnings of "undefined classes" during
installation when the package extends S3 classes or uses them as slots
UNLESSS they have been declared in a setOldClass() call. The green book
"strongly recommends" declaring S3 classs this way (pp 449-451).
The warnings on undeclared classes