# How to plot a graph that has two x-axis?

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Bum 2012년 12월 29일
댓글: Priyank Sharma 2016년 5월 16일
I want to plot Extreme Value Type I,II,III distribution curve. How can I plot a graph that has two x-axis? One x-axis(main) which is 'reduced variate' is linear and the other x-axis(sub) which is 'year' is non-linear. It looks like as below.
one x-axis(main): reduced variate
-------------------------------------------
-2 -1 0 1 2 3 4 5 6
the other x-axis(sub): year
-----------------------
2 5 10 20 50 100
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Priyank Sharma 2016년 5월 16일
I am also in search of the solution. If you find one, kindly share with me... My mail id is pjs230688@gmail.com

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### 답변(3개)

Walter Roberson 2012년 12월 29일
In the File Exchange, you will find plotxx
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Bum 2012년 12월 31일
Sorry for my poor explanation. (1) The main axis(lower axis) is transformed axis and the sub axis(upper axis) is original axis. (2) The relationship between original x-axis(T) and transformed x-axis(Xt) is Xt=-ln[ln(T/(T-1)] (3) If I click on points, is it possible to show both transformed and original values? If it's impossible it is okay to show the transformed values. (4) The (x,y) that I want to plot is transformed values.

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Scott 2012년 12월 31일
You have to be a little creative. I would start with the explanation at http://www.mathworks.com/help/matlab/creating_plots/using-multiple-x-and-y-axes.html. This isn't quite your case, but it explains how to do the overlays. You would plot the function twice on the two different axes. Then on the second one, you would need to use the 'XTick' and 'XTickLabel' properties to display the second axis as you described.
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Malcolm Lidierth 2012년 12월 31일
With Waterloo graphics, you can have any number of layered graphs each with independent axes (linear, log etc):
For MATLAB examples see:
For the project website see:

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