MATLAB: Find matching rows in matrices

Question

I want to find which rows in two matrices that are matching.

If I for example have

A =

     1     2
     4     5
     9     7
     1     2
     6     5

and

B =

     2     5
     1     2
     9     2
     1     2

I would like a result like

index_A=[1 4] index_B=[2 4].

Any idea how to solve this?

Answer 1

Use the 2nd and 3rd returned arguments in 'intersect':

 [~,index_A,index_B] = intersect(A,B,'rows');