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2009 Jul 15
5
Grouping data in dataframe
Hello,
I have a dataframe (obtained from read.table()) which looks like
     ExpA   ExpB   ExpC   Size
1      12     23    33      1
2      12     24    29      1
3      10     22    34      1
4      25     50    60      2
5      24     53    62      2
6      21     49    61      2
now I want to take all rows that have the same value in the "Size"
column and apply a function to the...