How to find out the column number of a same element of one matrix in other matrix?

If I have two different matrices, having some same element i.e. A=[23 45 6 7 89 12 3 6 7 8] and B=[6 7 45 12]. Now, in A and B some elements are same like 45, 6, 7 and 12. Now, I want to know/assign the column number of theses same elements (45, 6, 7 and 12) in A matrix. That means The column of each element of B in A matrix. Where the same elements are positioned (i.e. column) in matix A?

Answer 1

[madhan ravi]

Position=find(ismember(A,B))

Answer 2

[Walter Roberson]

[present, idx] = ismember(B, A);

present will be false for any element of B that is not in A. Otherwise B(K) == A(idx(K)) -- so idx is the entry number within A.

[AS]

It is working on these two matrices. But I have A=[30 by 100] and B=[30 by 10], where same 10 columns in B matrix are found out 100 columns. Now, to find out entry number of the 10 coulmns in A matrix.

[present, idx] = ismember(B, A); %this code is not working.

How I will find out?

[Walter Roberson]

[present, idx] = ismember(B.', A.', 'rows');

[AS]

Accepted..

Thank you very much. This code is working properly.