You may find a close reading of ?merge helpful, particularly this sentence: "If there is more than one match, all possible matches contribute one row each" (so check that you don't have multiple matches).
Hadley On Sat, Aug 21, 2010 at 10:45 AM, Cecilia Carmo <cecilia.ca...@ua.pt> wrote: > Hi everyone, > > I have been merging many big dataframes (about 80000 rows each) and I never > had this problem, but now it happened to me and I want to know if someone > knows what could be happening. > The final dataframe has many rows, an impossible number! I have done > edit(dataframe) and I saw that there are many repeated rows (all equal). > > Thanks for any help, > > Cecília Carmo > Universidade de Aveiro > Portugal > > ______________________________________________ > 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. > -- Assistant Professor / Dobelman Family Junior Chair Department of Statistics / Rice University http://had.co.nz/ ______________________________________________ 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.
