figure(1);
t=linspace(0,10*pi);
plot3(sin(t), cos(t), t);

figure(2);
[x, y] = meshgrid(-2*pi:2*pi, -2*pi:2*pi);
z = (sin(x)+cos(y)).^2;
mesh(x,y,z);
zoom on;

figure(3);
[x, y, z] = peaks(43);
surf(x, y, z);

figure(4)
contour(x, y, z);

figure(5);
[x, y, z] = sphere(23);
mesh(x, y, z);
hidden off;

