On Wed, 2006-02-01 at 17:10 -0500, Vivek Satsangi wrote: > This one is an easy question. I am looking for the "idiomatic" way to do it. > > I have two large data frames. I want to "merge" them. What is the > idiomatic way to say "match the rows from dataframe 1 to the rows in > dataframe2 which have the following fields the same: Identifier, Year > and Quarter? (These three fields form something like a composite > primary key in SQL). Then tell me which rows you could not find a > match for.... etc.
You answered your own question... :-) See ?merge which will perform SQL-like joins. HTH, Marc Schwartz ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
