concatenating dataframes (PR#381)
Mon, 20 Dec 1999 23:44:05 +0100 (MET)

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

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

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.

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