R: remove rows from one data frame that are in another

Question

I have two data frames df1 and df2. They have the same (two) columns. I want to remove the rows from df1 that are in df2.

Answer 1

I got an easy one considering you have a variable (var_match) that matches between the two dataframes:

df_1_minus_2 <- df_1[which(!df_1$var_match %in% df_2$var_match),]