lapply on an object and return a data.frame.Applies a function fun on each element of input x
and combines the results as data.frame columns.
The results will get replicated to have equal length
if necessary and possible.
dapply(x, fun, ..., col.names)[data.frame].
[data.frame]
Data frame.
[function]
The function to apply.
[any]
Further arguments passed down to fun.
[character(1)]
Column names for result.
Default are the names of x.