Re: [R] merging dataframes with diffent rownumbers 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 ______________________________________________ R-help@stat.math.ethz.ch 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.