MATLAB: Can this loop be vectorized

Question

I am trying to make a function for an histogram to explain the concept to students, is possible to vectorize this loop?

 [x,y]=size(A);                                                  
freq=zeros(256,1); 
for i=1:x
    for j=1:y
        value=A(i,j);
        freq(value+1)=freq(value+1)+1;
    end
end

thanks in advance.

Answer 1

Very simply with:

freq = accumarray(A(:), 1, [256, 1]);