[xx,yy,zz]=sphere(40);
x=xx*2;
y=yy*3;
z=zz*4;
subplot(2,2,1)
surf(x,y,z);
axis equal
subplot(2,2,2)
surf(x,y,z);
axis equal
view(0,90) %xoy
subplot(2,2,3)
surf(x,y,z);
axis equal
view(90,0) %yoz
subplot(2,2,4)
surf(x,y,z);
axis equal
view(0,0) %xoz