Re: [R] Swap variables in data.frame

From: Paul Smith <phhs80_at_gmail.com>
Date: Mon, 02 Jun 2008 13:12:51 +0100

On Mon, Jun 2, 2008 at 1:04 PM, Birgitle <birgit.lemcke_at_systbot.uzh.ch> wrote:
>
> Thanks Paul.
>
> I am not sure if I understood well, but when I do it then I have only two
> columns left:
>
>> L3 <- LETTERS[1:3]
>> (d <- data.frame(cbind(x=1, y=1:10, z=11:20), fac=sample(L3, 10,
>> replace=TRUE)))
> x y z fac
> 1 1 1 11 C
> 2 1 2 12 B
> 3 1 3 13 B
> 4 1 4 14 C
> 5 1 5 15 C
> 6 1 6 16 B
> 7 1 7 17 C
> 8 1 8 18 C
> 9 1 9 19 B
> 10 1 10 20 C
>> d <- d[,c(2,1)]
>> d
> y x
> 1 1 1
> 2 2 1
> 3 3 1
> 4 4 1
> 5 5 1
> 6 6 1
> 7 7 1
> 8 8 1
> 9 9 1
> 10 10 1
>
> But I have more than two columns in my data.frame.

In your case, it should be

# Swap the two first columns
d <- d[,c(2,1,3,4)]
# Swap column 2 and 3
d <- d[,c(1,3,2,4)]

Notice that my data frame had only two columns.

Paul



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