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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