我想在R中通过ID为每个重复的行分配值
df <- data.frame(ID=c(1,1,1,2,2,2,2,2,3,3,4),
Code = c("A","A","A","B","B","C","C","D","A","A","C"))
> df
ID Code
1 1 A
2 1 A
3 1 A
4 2 B
5 2 B
6 2 C
7 2 C
8 2 D
9 3 A
10 3 A
11 4 C
我希望输出结果如下,通过ID检查重复项,然后将第二个重复项指定为_1,以此类推...
ID Code Code_n
1 1 A A
2 1 A A_1
3 1 A A_2
4 2 B B
5 2 B B_1
6 2 C C
7 2 C C_1
8 2 D D
9 3 A A
10 3 A A_1
11 4 C C
ave(as.character(df$Code), df$ID, FUN=function(x) make.unique(x,sep="_") )
- thelatemail