MATLAB: Finding common elements in two matrices of different lengths

Question

Greetings, I’ve a question about comparing matrices 'a' and 'b' then creating a third matrix 'c' based on matching pairs of numbers in two other matrices. Current example:

a = [17,9;23,3;24,3;23,3;24,3;9,6;10,6;23,3;24,3;23,3]
b = [17,1;18,1;21,1;23,3;24,3;23,4;24,4;9,6;10,6;14,12;23,12;24,12;23,14]

My goal is to create 'c' where both columns in 'a' and 'b' are the same. So, row 1 of 'a' would be excluded, as would the first 2 rows of 'b', etc. etc.. Any help with accomplishing this task would be greatly appreciated.

Cheers, Jason

Answer 1

It is not clear what output you want, considering you have two inputs. Perhaps

c = intersect(a,b,'rows');

or

 c = [ismember(a,b,'rows'); ismember(b,a,'rows')];