R:从一个数据框中删除另一个数据框中的行

Question

我有两个数据帧df1和df2.它们具有相同的(两列)列.我想从df2中删除df1中的行.

Answer 1

你可以用几个包来做到这一点.但是这里是如何用基础R做的.

df1 <-matrix(1:6,ncol=2,byrow=TRUE)
df2 <-matrix(1:10,ncol=2,byrow=TRUE)
all <-rbind(df1,df2) #rbind the columns
#use !duplicated fromLast = FALSE and fromLast = TRUE to get unique rows.
all[!duplicated(all,fromLast = FALSE)&!duplicated(all,fromLast = TRUE),] 

     [,1] [,2]
[1,]    7    8
[2,]    9   10