Contour plot of stresses in a beam

Question

Nikola 2011-11-10

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https://ww2.mathworks.cn/matlabcentral/answers/20890-contour-plot-of-stresses-in-a-beam

回答： Vishal Jangid 2018-2-11

Hello,

could someone please help me with my problem, I am still a beginner in using MatLAB. I have a set od stress values in a beam. Each stress value is computed at a specific point with it's coordinates x and y. What I want is to plot a contour plot of the stresses in the beam, where the exact stress is located at point (x,y) in the beam. So, basically I have 3 vectors with 2 of them being the x and y coordinates and the third being the value at the point. I need to plot a contour plot with this data. Any help would be appreciated.

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Answer 1

Fangjun Jiang 2011-11-10

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https://ww2.mathworks.cn/matlabcentral/answers/20890-contour-plot-of-stresses-in-a-beam#answer_27582

You can use the TriScatteredInterp function. Just replace mesh() with contour() in the example provided.

x = rand(100,1)*4-2;
y = rand(100,1)*4-2;
z = x.*exp(-x.^2-y.^2);
F = TriScatteredInterp(x,y,z);
ti = -2:.25:2;
[qx,qy] = meshgrid(ti,ti);
qz = F(qx,qy);
figure(1);scatter3(x,y,z);
hold on;
mesh(qx,qy,qz);
figure(2);
contour(qx,qy,qz);

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Nikola 2011-11-11

Did not help, I still can't do a contour plot!

Fangjun Jiang 2011-11-11

In the example provided, x,y and z are similar to yours. They are just three vectors indicating the coordinates and the z value. After some processing, you can generate the needed data and run contour().

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