You can do:
factor(c(as.character(l1), as.character(l2)))
HTH,
Andy
> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Svetlana Eden
> Sent: Thursday, February 05, 2004 2:51 PM
> To: r-help at stat.math.ethz.ch
> Subject: Re: [R] What is the correct way to merge factors?
>
>
> 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?
> ---------------------
>
> --
> Svetlana Eden Biostatistician II School of Medicine
> Department of Biostatistics Vanderbilt
> University
>
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