I'm new to the R language and still struggling with compactness of R. I
haven't got the right compass into the Documentation, too. So, please
apologize the possibly stupidiy of my question.
I have the following problem:
I have two data sets combined in a data.frame
 x      y
1.3     2.2
2.5     3.4
3.1     3.7
8.2     9.5 
7.5     8.3
For the analyses of the data I want to group one column (like the
classes in a histogram).
So I'd like to add one column with the center of each group with width=2
for an x value in the interval of the class.
So the output should look like 
  x     y       x-grouped
1.3     2.2     1
2.5     3.4     3
3.1     3.7     3       
8.2     9.5     9
7.5     8.3     7
What would be the R'ish idiom to do this operation?

TIA
joachim
-- 
Dr. Joachim Heidemeier
c/o Umweltbundesamt FG II 2.2
Tel.: +49340 2103-2780 
eMail: [EMAIL PROTECTED]
 

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