Suppose this is my list of transactions:
set.seed(200)
tran=random.transactions(100,3)
inspect(tran)
items transactionID
1 {item80} trans1
2 {item8,
item20} trans2
3 {item28} trans3
I want to get the 'transpose' of the data, i.e.
transactionID items
1 {trans2} item8
2 {trans2} item20
3 {trans3} item28
4 {trans1} item80
I tried converting tran into a matrix, then transpose it, then convert it
back to transactions. But my dataset is actually very very large, so I
wonder if there is any faster method?
Thanks
--
KC
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