Implementation of skyline query or efficient frontier

Question

I know there must be an easy answer to this but somehow I can\'t seem to find it...

I have a data frame with 2 numeric columns. I would like to remove from it, the r

Answer 1

Here is an sqldf solution where DF is the data frame of data:

library(sqldf)
sqldf("select * from DF a
 where not exists (
   select * from DF b
   where b.Col1 >= a.Col1 and b.Col2 >  a.Col2  
      or b.Col1 >  a.Col1 and b.Col2 >= a.Col2
 )"
)