How to detect which rows are left in the matrix when the unique function is used to eliminate the repeated rows?

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Hi, I have
a= 1 1
1 2
1 2
1 2
1 1
1 2
b=unique(a,'rows');
>>b= 1 1
1 2
I want to know which rows are [1 1] and [ 1 2] in 'a'. Output can be 1 and 2, 1 and 3, or 5 and 6. As long as the first number represents the row of [1 1] and the second number for [1 2].
How am i going to do this? Thank you.

Accepted Answer

Ahmet Cecen
Ahmet Cecen on 19 Aug 2014
[C,ia,ic] = unique(A,'rows')

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