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. -- Vivek Satsangi Student, Rochester, NY USA ______________________________________________ [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
