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abi
2011 Aug 08
1
select from matrix
Suppose I have a matrix like
A=matrix(0,4,6)
A[1,]=c(16,10,2,4,8,7)
A[2,]=c(16,10,12,14,8,7)
A[3,]=c(16,10,13,15,19,17)
A[4,]=c(16,9,13,15,9,7)
> A
[,1] [,2] [,3] [,4] [,5] [,6]
[1,] 16 10 2 4 8 7
[2,] 16 10 12 14 8 7
[3,] 16 10 13 15 19 17
[4,] 16 9 13 15 9 7
I want to creat an indicator variable X which takes three values:
X=1