How do I create a (n x n) matrix whose elements alternate 1 or 0?

How do I create a (n x n) matrix whose elements are either 1 or 0 such that the value of each element is different from its adjacent elements, both from those above and below it and from those on either side of it.

Answer 1

[Roger Stafford]

   M = toeplitz(mod(1:n,2),mod(1:n,2));

[Jos (10584)]

M = mod(toeplitz(1:n),2)

Answer 2

[Matt J]

[I,J]=ndgrid(1:n);

A=((-1).^(I+J)+1)/2