%[x,y] = meshgrid(-5.12:0.05:5.12);
 % z=x.^2+y.^2; 
%figure;  mesh(x,y,z);title('Sphere Model Function','FontSize',16);

%[x,y] = meshgrid(-2.048:0.05:2.048);
 % z=100*(y-x.^2).^2+(1-y).^2; 
% figure; mesh(x,y,z);title('Rosenbrock Function','FontSize',16);
 

 figure;ezsurf('x*(1-y)+5',[1,4,1,2],60);
% ezplot('x^2/4',[1,4]);