I have two factors l1, l2, and I'd like to merge them.
Function c() does not give me the result I want:
> l1 = factor(c('a', 'b'))
> l2 = factor(c('c', 'd'))
> lMerge = c(l1, l2)
> lMerge
[1] 1 2 1 2
>
I'd like to merge l1 and l2 and to get lMerge
----------------------------------------------
[1] a b c d
Levels: a b c d
instead of
----------
[1] 1 2 1 2
>
How should I do that?
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Svetlana Eden Biostatistician II School of Medicine
Department of Biostatistics Vanderbilt University
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