Creating a square identity matrix [closed]

Let’s do it in two simple lines and without zeros… The first line creates a n x n matrix where all elements are 0. After you can (as your hint says) address the elements with a single argument. The distance between the ones in the identity matrix are n+1. This way you write the ones with the mentioned distance until the end.

function out = identity(n)
    out(n,n)       = 0;
    out(1:n+1:end) = 1;
end