Removing data from one dataframe that exists in another dataframe R

Question

I want to remove data from a dataframe that is present in another dataframe. Let me give an example:

letters<-c(\'a\',\'b\',\'c\',\'d\',\'e\')
numbers<-c(1         


        

Answer 1

Base R Solution

list_one[!list_one$letters %in% list_two$letters2,]

gives you:

  letters numbers
2       b       2
5       e       5

Explanation:

> list_one$letters %in% list_two$letters2
[1]  TRUE FALSE  TRUE  TRUE FALSE

This gives you a vector of LENGTH == length(list_one$letters) with TRUE/FALSE Values. ! negates this vector. So you end up with FALSE/TRUE values if the value is present in list_two$letters2.

If you have questions about how to select rows from a data.frame enter

?`[.data.frame`

to the console and read it.