%Create fancy plot
n=10; 
x=linspace(0,4,n); 
y=linspace(1,5,n);
for i=1:n
	for j=1:n
		z(i,j)=x(i)^2+y(j)^2+4*x(i)-6*y(j);
	end
end
mesh(x,y,z)