3D plor plot

Question

Mario 2016-4-20

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/280037-3d-plor-plot

回答： Mike Garrity 2016-4-20

Is there a way to plot data in a cylindrical scatter plot? I have a (70000x3) matrix of angles, radius and a third variable that I would like to plot in the same graph.

Much like the polar plot plus an additional z-direction. I have seen "3D Polar Plot" etc, but they only provide mesh or contour plots and I would like to plot the individual points. Basically a scatter3 but in cylinder coordinates.

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Answer 1

Mike Garrity 2016-4-20

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/280037-3d-plor-plot#answer_218709

The pol2cart function will convert this to 3D Cartesian, so it's easy to get the scatter plot:

npts = 70000;
th = 2*pi*rand(npts,1);
r = 5+rand(npts,1)/3;
v = randn(npts,1);
[x,y,z] = pol2cart(th,r,v);
c = v;
scatter3(x,y,z,8,c,'.')
axis equal
view(-65,42)