How to compare two sets of XY data?

I have two sets of XY coordinate data. I would like to compare these two sets and count how many same XY coordinate?

For example

A=
(1  2)
(3  5)
(4  6)

B=
(3  4)
(4  6)
(1  1)
(7  8)

result should be count same coordinate= 1 ( that's (4 6))

Answer 1

[the cyclist]

C = intersect(A,B,'rows')
numberCommonRows = size(C,1);

You can also call intersect() with additional output arguments, which will identify which rows of A and B are the shared ones.