Creating a matrix with 2 vectors

Hello, I want to create a matrix of ones and zeros using pairs defined by 2 vectors. Is there a smart way of doing that? For example if I have 2 vectors I=[1,1,2,2,3,3] and J=[1,2,3,4,5,6] I want a matrix that looks like this:

1 1 0 0 0 0 
0 0 1 1 0 0
0 0 0 0 1 1

Thank you

Answer 1

[Walter Roberson]

A = full(sparse(I,J,1));

or

A = accumarray([I(:), J(:)], 1);

or

A = zeros(max(I),max(J));
A(sub2ind(size(A), I, J)) = 1;

[Hadar Israeli]

Thank you