[R] replace data by a rule

[Rui Barradas]

Hello,

Like this?

x = data.frame(id = 1:8, f1 = LETTERS[1:8])
idx <- 5 <= x$id & x$id <= 8
x$id[idx] <- x$id[idx] - 4
x


Hope this helps,

Rui Barradas

Em 06-05-2013 22:29, Hui Du escreveu:
> Hi All,
>
> I have data set like
> x = data.frame(id = 1:8, f1 = LETTERS[1:8])
>
> I want to replace id 5, 6, 7, 8 by 1, 2, 3, 4 respectively. e.g the map is
>
> ID-1
>
> ID-2
>
> 5
>
> 1
>
> 6
>
> 2
>
> 7
>
> 3
>
> 8
>
> 4
>
>
>
> I have lots of data and rules. How to do it in a few lines rather than do them one by one like:
>
> x[x$id == 5,]$id = 1
> x[x$id == 6,]$id = 2
>
> etc.
>
> Thanks.
>
> HXD
>
>
>
>
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