Hi all (again),
I have a data frame "pop":
xloc yloc yield
1 10 12 95
2 11 10 81
3 12 11 20
4 12 11 10
And I want to get the sum of yield for the cell (pop$xloc, pop$yloc) in
a matrix as follows:
xloc
10 11 12
10 0 81 0
yloc 11 0 0 30
12 95 0 0
Any ideas? thanks!
Nico
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