hadley wickham wrote:
a <- data.frame(b = rep(1:5, each=2), c=factor(rep("a",10), levels=c("a","b"))) levels(subset(a, b=1, drop=T)$c) # [1] "a" "b"
Is this a bug?
No, drop = TRUE is not doing what you're thinking it's doing. From ?subset (R-1.9.1):
The 'drop' argument is passed on to the indexing method for data
frames.I think you're hoping it is passed on to the indexing method for factors, which it isn't.
--sundar
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