我有一个这样的数据框:
x=c("01","01","01","22","22","03","03","03","35","35")
y=c("f","f","f","m","m","m","m","m","f","f")
df=data.frame(spn=x, sex=y)
看起来像:
spn sex
1 01 f
2 01 f
3 01 f
4 22 m
5 22 m
6 03 m
7 03 m
8 03 m
9 35 f
10 35 f
我想做的是对 df$spn 进行排序并让它只出现一次。适当的 df$sex 也是如此,例如:
spn sex
1 01 f
2 03 m
3 22 m
4 35 f
我怎么能那样做?非常感谢!