如何绘制两个方向的x轴
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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.
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