How to add a second x-axis on top in plot?

Question

Nadatimuj 2021-7-12

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/877083-how-to-add-a-second-x-axis-on-top-in-plot

编辑： John R 2021-12-8

I think something similar is asked in the forum before and there is a documentation on how to add second a y-axis. But I am not exactly getting what I want. It would be great if someone can help.

I want something very simple. I have x1, x2, and corresponding y. I want to plot y and show x2 at the bottom axis and x1 at the top axis. Please remember, x1 and x2 are related, so x1 = 14 will refer to x2 = 399 and they will plot y =1..and so on.

x1 = [14 16 18 20 22];
x2 = [399 520 675 830 1001];
y =[1 2 3 4 5];
plot(x2,y)

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Answer 1

Jonas 2021-7-12

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https://ww2.mathworks.cn/matlabcentral/answers/877083-how-to-add-a-second-x-axis-on-top-in-plot#answer_745228

this may be the function you are searching for

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Nadatimuj 2021-7-12

Thanks but no, not this one. This one requires y1 and y2 that means two seperate plots and the x axes are not related.... But I want only one y plot and two related x-axes for the same plot.

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Answer 2

John R 2021-11-5

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/877083-how-to-add-a-second-x-axis-on-top-in-plot#answer_824679

编辑：John R 2021-12-8

在 MATLAB Online 中打开

x1 = [14 16 18 20 22];
x2 = [399 520 675 830 1001];
y =[1 2 3 4 5];
t=tiledlayout(1,1);
ax1=axes(t);
set(ax1,'XLim',[min(x1) max(x1)]);
plot(ax1,x1,y)
ax1.XTick=x1;
ax1.YTick=[];
ax1.XTickLabel=x1;
ax2=axes(t);
set(ax2,'XLim',[min(x1) max(x1)]);
plot(ax2,x1,y)
ax2.XAxisLocation='top';
ax2.XTick=x1;
ax2.XTickLabel=x2;