sub2ind problem for matrix

2011 7 4
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I have a matrix
r =
6 1
5 2
4 3
3 3
2 3
1 2
2 3
3 3
4 3
5 2
6 1
and a matrix I.
I applied
idx=sub2ind(size(I),r)
It shows me the following:
idx =
6 1
5 2
4 3
3 3
2 3
1 2
2 3
3 3
4 3
5 2
6 1
how to get the correct one easily? thanks

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