Operate on pairs of rows of a data frame
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by lorin
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Published on 2010-04-11T03:05:37Z
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2010/04/11
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I've got a data frame in R, and I'd like to perform a calculation on all pairs of rows. Is there a simpler way to do this than using a nested for loop?
To make this concrete, consider a data frame with ten rows, and I want to calculate the difference of scores between all (45) possible pairs.
> data.frame(ID=1:10,Score=4*10:1)
ID Score
1 1 40
2 2 36
3 3 32
4 4 28
5 5 24
6 6 20
7 7 16
8 8 12
9 9 8
10 10 4
I know I could do this calculation with a nested for loop, but is there a better (more R-ish) way to do it?
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