clear

[x,y] = meshgrid(-5.12:0.05:5.12);
z=(x.^2-10*cos(2*pi*x)+10)+(y.^2-10*cos(2*pi*y)+10);
mesh(x,y,z);
title('Generalized Rastrigin''s Function','FontSize',16);
axis([-6,6,-6,6,0,100]);