Minus operation of data frames

Question

I have 2 data frames df1 and df2.

df1 <- data.frame(c1=c(\"a\",\"b\",\"c\",\"d\"),c2=c(1,2,3,4) )
df2 <- data.frame(c1=c(\"         


        

Answer 1

You can check the values in both columns and subset like this (just adding another solution):

na.omit( df1[ sapply( 1:ncol(df1) , function(x) ! df1[,x] %in% df2[,x] ) , ] )
#  c1 c2
#1  a  1
#2  b  2