On 16/12/12 18:38, Tjun Kiat Teo wrote:
Suppose I have a matrix of data
A
1 2 3
4 5 6
7 8 9
And I have a vector of indexes 2,1,3
For row 1 of matrix A I want the 2nd element 2
For row 2 of matrix A I want the 1st element 4
For row 3 of matrix A I want the 3rd element 9.
Is there a quick way to do it ?
A[cbind(1:3,c(2,1,3))]
cheers,
Rolf Turner
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