Find common rows between two matrices with different number of columns

I have two matrices A and B.

A = [1 2 3; 4 5 6; 7 8 9]

A = 3×3

1 2 3 4 5 6 7 8 9

B = [1 3 20 2; 1 2 3 55; 7 8 9 10; 88 2 1 5]

B = 4×4

1 3 20 2 1 2 3 55 7 8 9 10 88 2 1 5

and I need to extract the rows in B matrix with common elements in A matrix, row by row.

The result shall be like that:

common_rows = [1 3 20 2; 1 2 3 55; 7 8 9 10]

common_rows = 3×4

1 3 20 2 1 2 3 55 7 8 9 10

Thanks.

Answer 1

[Dyuman Joshi]

A = [1 2 3; 4 5 6; 7 8 9];
B = [1 3 20 2; 1 2 3 55; 7 8 9 10; 88 2 1 5];

%Indices of rows in B
idx = 1:size(B,1);

for k=idx
    %If elements in a row of B are not common with all elements of any row
    %in A, remove that row index
    if ~any(all(ismember(A, B(k,:)),2))
        idx = setdiff(idx, k);
    end
end
idx

idx = 1×3

1 2 3

C = B(idx, :)

C = 3×4

1 3 20 2 1 2 3 55 7 8 9 10

[Bassem Mokhtar]

Many thanks. It works!

[Dyuman Joshi]

You're welcome!