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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...