[R] merging dataframes with diffent rownumbers

From: Thomas Hoffmann <thomas.hoffmann_at_uni-bonn.de>
Date: Mon, 18 Jun 2007 10:09:47 +0200

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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