[R] Transforming relational data

[mathijsdevaan]

The output for the new example should be:

project  v
1  0
2  0.5
3  1.5
4  0.5

The output you calculated was correct for the v per year, but the v per
group would be incorrect. I think the problem lies in the fact that
expand.grid(B,B) doesn't take into account that combinations of B can only
be formed within A. Thanks again!


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