How to create a graph with X, Y + Contour Axes.

Question

Al Onen 2012-2-20

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/29721-how-to-create-a-graph-with-x-y-contour-axes

编辑： Matt J 2013-10-25

Hello, I need some guidance for creating a very similar chart shown below in the link.

http://i146.photobucket.com/albums/r268/krankxx/Untitled-1-7.jpg

For each axis, including the contoured one, I also have some data between 0-1 (actally % values) of corresponding type and I am supposed to show them in a single chart. I am not sure about how to combine those different values into one. If someone can offer some guidance with key functions, I would be greatly faithful.

Thanks in advance.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

the cyclist 2012-2-20

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/29721-how-to-create-a-graph-with-x-y-contour-axes#answer_38105

在 MATLAB Online 中打开

Here is a simple example, which I hope you can bend to your needs. I adapted it from the documentation here: http://www.mathworks.com/help/techdoc/ref/contour.html. I think it illustrates most of what you want, including how to overlay multiple plots (with the hold command), adding labels to the contours, etc. There are help files for all the different functions I used, of course.

figure
hold on
[X,Y] = meshgrid(-2:.2:2,-2:.2:3);
Z = X.*exp(-X.^2-Y.^2);
[C,h] = contour(X,Y,Z);
set(h,'ShowText','on','TextStep',get(h,'LevelStep')*2)
addedRandomX = rand(1,20);
addedRandomY = rand(1,20);
plot(addedRandomX, 1+addedRandomY,'kx')
plot(-addedRandomX,1+addedRandomY,'ro')

5 个评论
显示 3更早的评论隐藏 3更早的评论

the cyclist 2012-2-26

The reason you got the mldivide error when calculating Z is that you were using the syntax for matrix division, where you actually wanted element-by-element division.

Try this instead:

figure

hold on

[X,Y] = meshgrid(-2:.2:2,-2:.2:3);

Z = 1./((1./(1-Y))+(1./X)-1);

[C,h] = contour(X,Y,Z)

Notice that I added "./" in place of just "/". The dots are the syntax for element-by-element operations.

I'm not sure if the result is what you expect, but at least it executes.

Al Onen 2012-2-26

Thank you so much. Indeed it works - I'm such a loser with Matlab. :) I have to keep the purpose of dots in mind. Now the answer is officially accepted.

请先登录，再进行评论。