How do I find all the points between two contour lines

[X,Y] = meshgrid(-1:0.01:1);
Z = X.^2 + Y.^2;
line1_level = 0.2;
line2_level = 0.5;
levels = [line1_level line2_level];
mask = (Z > min(levels)) & (Z < max(levels));
x_list = X(mask);
y_list = Y(mask);

X and Y are grid points and Z is the function value. The code list all x and y points lying between contour lines at 0.2 and 0.5.

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Khalid Ibne Masood 2020-4-12

Contour Question.png

Hello,

Thanks a lot, I have partially solved the problem with your help.

But still I have some problem. Here I have attached a picture showing the contour lines. I can get all the points between the contour lines except for the contour 2.45. Since the contour level 2.45 is discreate, I would like to collect all the points that are enclosed by each branch.

Do you have any idea for this problem?

Thanks again.

Khalid

Ameer Hamza 2020-4-13

在 MATLAB Online 中打开

I am not clear about this question, but from your image, it appears that 2.45 is the highest level contour line, and you want to get the points between 2.45 and the edge of the mesh. If this is what you want and all the points between 2.45 and edge are higher than 2.45, then you can set the level like this

levels = [2.45 inf];

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