Hi,
I have a solution to concatenate two factors in one but I don't believe
it is the best one: factor(c(as.character(f1),as.character(f2)))
[1] a a b b b a
Levels: a b
You can always add a level by assigning a new vector at the level vector:
levels(f1) <- c("a","b","c")
f1
[1] a a b
Levels: a b c
udi cohen wrote:
> Hi all,
>
> I hope it's not too trivial for the list - I'm trying to concatenate
> two factor arrays, and obtain the following:
>
>
>> f1<-factor(c("a","a","b"))
>> f1
>>
> [1] a a b
> Levels: a b
>
>> f2<-factor(c("b","b","a"))
>> f2
>>
> [1] b b a
> Levels: a b
>
>> c(f1,f2)
>>
> [1] 1 1 2 2 2 1
>
> Instead of getting:
>
> [1] a a b b b a
> Levels: a b
>
> a related question is: how do I add a level which does not exists yet
> in a factored vector, so I'll be able to add later these values,
> without getting:
>
> In `[<-.factor`(`*tmp*`, 2, value = "c") :
> invalid factor level, NAs generated
>
> Thanks,
>
> EC
>
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>
--
Alain Guillet
Statistician and Computer Scientist
SMCS - Institut de statistique - Université catholique de Louvain
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