如何绘制两个方向的x轴

Answer 1

[Voss]

If I understand what you want to do, you can try something like this:

plot(-4:4,-4:4);

ax = gca();
set(ax,'XTickLabels',abs(get(ax,'XTick')));

Note that you would also have to update the XTickLabels whenever the XTicks change, e.g., when zooming or panning or potentially when the axes changes size.

[weihan wang]

thank you very much!

[Voss]

You're welcome!