concatenating dataframes (PR#381)

[jlindsey@alpha.luc.ac.be]

The following work if y is an ordinary matrix but not a dataframe:

tt <- NULL
y <- data.frame(1:20,1:20)
rbind(tt,y)

gives "incompatible types" error (if the dataframe contains only factor
variables, it gives warnings but works)

if I initialize instead with

tt <- list()

it gives a "missing value where logical needed" error.
Jim

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