r - How to concatenate factors, without them being converted to integer level? -


i surprised see r coerce factors number when concatenating vectors. happens when levels same. example:

> facs <- as.factor(c("i", "want", "to", "be", "a", "factor", "not", "an", "integer")) > facs [1]       want                    factor  not          integer levels: factor integer not want > c(facs[1 : 3], facs[4 : 5]) [1] 5 9 8 3 1

what idiomatic way in r (in case these vectors can pretty large)? thank you.

from r mailing list:

unlist(list(facs[1 : 3], facs[4 : 5]))

to 'cbind' factors, 

data.frame(facs[1 : 3], facs[4 : 5])

-

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