How to select only the last row among the subset of rows satisfying a condition in R programming

Question

The dataframe looks like this :

Customer_id A B C D E F G
10000001    1 1 2 3 1 3 1
10000001    1 2 3 1 2 1 3
10000002    2 2 2 3 1 3 1
10000002    2 2 1 4 2 3 1         


        

Answer 1

Something like this (hard to code without the data in R format):

dataframe[ rev(!duplicated(rev(dataframe$Customer_id))),]

or better

dataframe[ !duplicated(dataframe$Customer_id,fromLast=TRUE),]