%
% p.17 2.7�ß �ü�Ï•ª
% —á1

[x,y,z] = meshgrid(-0.2:.5:2.2,-0.2:.5:2.2,-0.2:.5:2.2);
%x=zeros(size(y));
u=2*ones(size(x));
v=zeros(size(y));
w=zeros(size(z));
quiver3(x,y,z,u,v,w)
hold on
%surf(x,y,z)

axis([0 2.2 0 2.2 0 2.2])
plot3([0 2],[0 0],[0 0],'r','LineWidth',3)
plot3([0 2],[0 2],[0 0],'m','LineWidth',3)
plot3([0 0],[0 2],[0 0],'g','LineWidth',3)
xlabel('x')
ylabel('y')
zlabel('z')
legend('E','Œo˜H1','Œo˜H2','Œo˜H3')