[R] merging dataframes with diffent rownumbers

[Petr Klasterecky]

No easy to understand what exactly you mean, but try
?merge
?cbind
?rbind

Petr

Thomas Hoffmann napsal(a):
> 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?
> Thanks in advance
> 
> Thomas H.
> 
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-- 
Petr Klasterecky
Dept. of Probability and Statistics
Charles University in Prague
Czech Republic