假设我们有两个变量x1和x2，我需要对x1 = {a，b，c，d}的数据进行子集化
mydata <- data.frame(x1=c("a","b","c","n","a","d","b","l","a","c","t","a","b","d","c","l","n","b"), x2=c(1,3,5,2,0,5,4,6,2,9,2,6,0,6,1,2,6,6))
x1 x2
1 a 1
2 b 3
3 c 5
4 n 2
5 a 0
6 d 5
7 b 4
8 l 6
9 a 2
10 c 9
11 t 2
12 a 6
13 b 0
14 d 6
15 c 1
16 l 2
17 n 6
18 b 6
您可以使用%in%：
> mydata[mydata$x1 %in% c("a", "b", "c", "d"), ]
x1 x2
1 a 1
2 b 3
3 c 5
5 a 0
6 d 5
7 b 4
9 a 2
10 c 9
12 a 6
13 b 0
14 d 6
15 c 1
18 b 6
还有subset功能：
subset(mydata, subset = x1 %in% c("a", "b", "c", "d"))
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