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x is a DataFrame. split(x, f, drop = FALSE):
Splits x into a CompressedSplitDataFrameList,
according to f, dropping elements corresponding to
unrepresented levels if drop is TRUE.
mstack(..., .index.var = "name"): Stacks the data frames
passed as through ..., using .index.var as the index
column name. See stack.
DataTable,
Vector, and
RangedData, which makes heavy use of this class.
## split
sw <- DataFrame(swiss)
swsplit <- split(sw, sw[["Education"]])
## rbind
do.call(rbind, as.list(swsplit))
## cbind
cbind(DataFrame(score), DataFrame(counts))
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