Subset DF by Unique Data Values for Factors in R : I am trying to filter a dataframe in which I have three columns, the 1st one is the date in format: "day/month/year", the 2nd one is the client name, and the 3rd one is the client spending on an  specific product, I want to filter this df so I could  get only the newest data purchase by client

Is there any way I could do this?



