# MATLAB: How to compare two matrices in different sizes/dimensions

MATLABmatricessubstraction

Hi there,
I would like to compare two matrices in different sizes.
For example, matrix A is a 4×4 matrix ; matrix B is a 3×4 matrix
A = 1 1 1 1 (the same)
1 -1 1 -1
1 1 -1 -1 (the same)
1 -1 -1 1
B = 1 1 1 1 (the same)
1 1 -1 -1 (the same)
1 -1 -1 -1
In the example above, matrix A and B are in different sizes.
In terms of rows however, 1st and 3rd row of A is the same as 1st and 2nd row of B.
My goal is to create a new matrix C, that contains the same rows after the comparision.
C = 1 1 1 1
1 1 -1 -1
Is there a method in terms of matlab that could perform such function?

• C = intersect(A, B, 'rows')  %possibly with the 'stable' option if ordering matters.