ismember: how to read the results quicker?

Hello. I would like to know how to return real values instead of logical values when the 'ismember' is used? eg:

A = [1 2 3 4 5]; 
B = [6 7 4 5 9 10 11 12];
ismember (A,B)
ans =

    1×5 logical array

     0   0   0   1   1

Is it possible to have this as output?

[4 5]

Answer 1

[Stephen23]

find(ismember(...))

Keep in mind that logical indexing is more efficient for simple indexing tasks, so the answer to the question posed in your title "ismember: how to read the results quicker?" is actually to do the opposite of what you asked: just use logical indexing, and not subscript indexing (and especially not waste time using find).

[wesleynotwise]

C001. Thank you :)

Answer 2

[Steven Lord]

Stephen's answer assumed A was of the form 1:N.

A = [5 4 3 2 1]; 
B = [6 7 4 5 9 10 11 12];
loc = ismember(A, B)
find(loc)
A(loc)

Use the output from ismember to index back into A to retrieve the elements of A that are in B.

[wesleynotwise]

Thanks for the suggestion, Steven.