[R] group by in data.frame

[zem]

hi guys,

many many thanks for all the solutions! :-D they are working great!
i have another "little" question: 
i would like to save these groups in a new column with serial number like
the solution from David, but wit integer values: 1,2,3... 
i do this allready but with my 1. solution and there is to much temp-data,
that i dont realy nead ... 
if you have any idea, that'll be really great! 

thanks a lot ! 
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