Matlab隐藏坐标轴

alpha=0:pi/80:16*pi; %角度[0,2*pi]
R=20; %半径
x=R*cos(alpha);
y=R*sin(alpha);
z=0:0.1:128;
plot3(x,y,z,'-')
axis equal;
%添加四条命令
ax=gca
ax.XAxis.Visible='off';
ax.YAxis.Visible='off';
ax.ZAxis.Visible='off';