Matlab undo axis tight axis image

坐标轴等比例用axis equal实现，或者daspect([1 1 1]);也可以

下面这句可以undo axis tight 和 axis image，因为axis normal设计上不会undo axis tight，下面三个属性是隐藏属性可以逆转axis tight：

set(gca,'XLimSpec','stretch','YLimSpec','stretch', 'ZLimSpec','stretch');

axis normal;