Re: [R] correction to the previously asked question (about merging factors)

[Spencer Graves]

     What about the following: 

> F1 <- factor(c("b", "a"))
> F2 <- factor(c("c", "b"))
> k1 <- length(F1)
> k2 <- length(F2)
> F12.lvls <- unique(c(levels(F1), levels(F2)))
> F. <- factor(rep(F12.lvls[1], k1+k1), levels=F12.lvls)
> F.[1:k1] <- F1
> F.[-(1:k1)] <- F2
> F.
[1] b a c b
Levels: a b c
     This saves converting the factors to characters, which might save 
computer time at the expense of your time. 
     hope this helps. 
     spencer graves

Svetlana Eden wrote:

I have two factors l1, l2, and I'd like to merge them.

(Remark:       The factors can not be converted to charaters)

Function c() does not give me the result I want:

 

l1 = factor(c('aaaa', 'bbbb'))
l2 = factor(c('ccc', 'dd'))
lMerge = factor(c(l1, l2))
lMerge
   

[1] 1 2 1 2
Levels: 1 2
 

I'd like to merge l1 and l2 and to get lMerge 
----------------------------------------------

[1] aaaa bbbb ccc dd
Levels: aaaa bbbb ccc dd
instead of 
----------

[1] 1 2 1 2
Levels: 1 2
 

How should I do that without converting the factors back to strings.
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