Hello,
I have a matrix that is a product of tapply on a larger data set.
Let's assume it looks like this:
X<-matrix(c(10,20,30,40,50,60),2,3)
dimnames(X)<-list(c("1","2"),c("1","2","3"))
(X)
1 2 3
1 10 30 50
2 20 40 60
Is there an efficient way of transforming this matrix into the following matrix:
rows columns entries
1 1 10
1 2 30
1 3 50
2 1 20
2 2 40
2 3 60
Thank you very much!
--
Dimitri Liakhovitski
MarketTools, Inc.
dimitri.liakhovit...@markettools.com
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