3D Plot from finite 2D Plots in each section!

Question

Hossein 2015-9-18

0
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https://ww2.mathworks.cn/matlabcentral/answers/243827-3d-plot-from-finite-2d-plots-in-each-section

回答： emehmetcik 2015-9-18

Hi everyone, I am searching for a solution to create a 3D plot to show the whole distribution of load over a cylinder using finite (Nj) numbers of load distribitution in each section of the cylinder in axial direction:

    for j=1:Nj
for i=1:Ni
    X1(j,i)=2e2*1*cos(theta(1,i));
    Y1(j,i)=2e2*1*sin(theta(1,i));
    X(j,i)=2e2*LOAD(j,i)*cos(theta(1,i));
    Y(j,i)=2e2*LOAD(j,i)*sin(theta(1,i));
end
end

Here the X1 and Y1 describe the normal circle of each cylinder section and X,Y describe the load distibution in each section over this cylinder. What I want is a 3D plot which put all of these sections behind each other and build up the whole cylinder. Can anybody help me?

Thanks all!

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Answer 1

emehmetcik 2015-9-18

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/243827-3d-plot-from-finite-2d-plots-in-each-section#answer_192923

在 MATLAB Online 中打开

You can use plot3() function.

figure; hold on;
for j=1:Nj
    plot3(X(j, :), Y(j, :), j*ones(size(X(j, :))))
end
view(3);

Also, avoid using nested "for" loops, especially when you can easily use vectorised forms. (e.g. remove the second loop by replacing i with 1:Ni, and replace the matrix products * with elementwise products .*). You can further improve your code with repmat function.