MATLAB: FInd vector in matrix

Question

Lets assume that I have a matrix A 300×2 with x y coordinates. I want to find how many times a specific [x y] exists in this matrix A. I ve tried this but find can search only single values.

i = find(A == [x y]);

Any idea?????

Answer 1

Another method:

I = sum(A(:, 1) == x & A(:, 2) == y);

EDITED: Buggy multiplication method removed. Thanks Andrei!

This method is about 50 times faster than ISMEMBER(A, b, 'rows').