function rosso_verde(n)
a = zeros(n);
for i=1:n
a(i,1)=((i-1)*n)+1;
end

	for i = 1 : n
		for j = 2 : n
			a(i,j) = a(i,j-1)+1;
		end
	end
n2=n^2;
A=zeros(n2,3);
v=zeros(n,1);
for i=1:n
	v(i)=(i-1)/(n-1);
end
e=ones(n,1);
A(:,1)=kron(v,e);
A(:,2)=kron(e,v);
colormap(A);
imagesc(a);
end
