[R] group by in data.frame

[zem]

10x i solved it ... mein problem was that i had 2 column by them i have to
group, i just "pasted" the values together so that at the end i have one
column to group and then was easy ... 
here is the script that i used:
http://tolstoy.newcastle.edu.au/R/help/06/07/30184.html
Ivan thanks for the help too :) 
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