R: Remove duplicates from a dataframe based on categories in a column

Question

Here is my example data set:

      Name Course Cateory
 1: Jason     ML      PT
 2: Jason     ML      DI
 3: Jason     ML      GT
 4: Jason     ML      SY
 5: Ja         


        

Answer 1

You're not removing based on category, you're really trying to remove full duplicate rows from the dataframe.

You can remove full duplicate rows by subsetting the dataframe:

base R:
df_without_dupes <- df[!duplicated(df),]