匹配两个向量的值

I have the data frame:

我有数据框架:

AA<-c(4,1,5,3,2,13,17,16,14,15,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA)

BB<-c(3,15,4,2,13,19,20,14,7,12,8,18,11,5,16,17,9,6,10,1)

CC<-c(118,106,115,120,105,111,104,101,102,110,119,108,113,109,114,116,103,107,112,117)

DD<-data.frame(AA,BB,CC)
AA<-c(4,1,5,