Find the corresponding matrix

My matrix A is going to be an n by 4 matrix, and B is going to be an m by 1 column matrix, and I want to find all the columns in A and if B exists, then I want to represent the row number of A and extract the data from that row of A

For example：

A =[14 17 19 2

19 12 11 20

20 12 11 7

18 5 16 6];

B = [1;2;5;6;11;12;14;17;19;20];

The result should be :

index = 1 2;

data = [[14 17 19 2

19 12 11 20];

I wrote a program to show empty, do not know where the error

row_numbers = [];

for row=1:size(A, 1)

if all(ismember(B, A(row, :)))

row_numbers = [row_numbers row];

end

end

disp(row_numbers);

Answer 1

[Askic V]

Is this what you need?

A =[14	17	19	2
19	12	11	20
20	12	11	7
18	5	16	6];

B = [1;2;4;5;6;11;12;14;17;19;20];

rA = size(A,1);
ind = ismember(B,1:rA);

M = A(B(ind),:)

M = 3×4

14 17 19 2 19 12 11 20 18 5 16 6

[Chenglin Li]

Yes, that's what I want. Thank you very much！