At 09:09 18/06/2007, Thomas Hoffmann wrote: >Dear R-Helpers, > >I have following problem: > >I do have two data frames dat1 and dat2 with a commen column BNUM >(long integer). dat1 has a larger number of BNUM than dat2 and >different rows of dat2 have equal BNUM. The numbers of rows in dat1 >and dat2 is not equal. I applied the tapply-function to dat2 with >BNUM as index. I would like to add the columns from dat1 to the results of > >b.sum <- tapply(dat2, BNUM, sum). > >However the BNUM of b.sum are only a subset of the dat1. > >Does anybody knows a elegant way to solve the problem?
If I understand you correctly ?merge should help you here >Thanks in advance > >Thomas H. > > Michael Dewey http://www.aghmed.fsnet.co.uk ______________________________________________ [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 and provide commented, minimal, self-contained, reproducible code.
