How do you vectorize the following for loop?

I'm trying to vectorize this for loop. A and B are both vectors. The general idea is that D should be a vector made up of 0's and 1's whenever an element of B matches A. For example, since B(3)=6 and A(6)=6, D(6) should be equal to 1. Here's the non-vectorized (correct) code:

A=[1:10]'; B=[1 2 6 9]'; D=zeros(length(A),1);

for i=1:length(B) C=(A==B(i)); D=D+C; end

My initial guess at vectorization was this: (NOTE: this code is incorrect)

A=[1:10]'; B=[1 2 6 9]'; D=(A==B);

The error comment I get after running the incorrect code is: Error using == Matrix dimensions must agree.

Thanks ahead of time, and if I'm unclear in anyway, I'd gladly clarify.

Answer 1

[Image Analyst]

Use ismember()

A=[1:10]' 
B=[1 2 6 9]'
D = ismember(A, B)