How to compare two matrices in different sizes/dimensions ?

Hi there,

I would like to compare two matrices in different sizes.

For example, matrix A is a 4x4 matrix ; matrix B is a 3x4 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?

Answer 1

[Guillaume]

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

[Moses Tang]

Thank you very much! it is working fine.