Suppose I have the following data frame (df): Year Price ------------------- 2001 10 2002 20 2003 30
I would like to produce another data frame like this: a.Year a.Price b.Year b.Price ---------------------------------------------------- 2002 20 2001 10 2003 30 2001 10 2003 30 2002 20 In SQL, this can be done as select a.*, b.* from df as a, df as b where a.Year > b.Year How do I do this efficiently in R? Many thanks. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
