Mesh Plot from Data Points

Question

Garrett Skinner 2019-1-18

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https://ww2.mathworks.cn/matlabcentral/answers/440448-mesh-plot-from-data-points

回答： Naman Chaturvedi 2019-1-21

I am trying to create a 3d mesh plot from data points. The plot i'm trying to create is dose rate in 3d space in a cylindrical coordinate system. I keep getting an error telling me that the size of the matrices are correct. Dose is a 220x35 matrix, r is broken down into 35 steps from 0 to 24, z is broke down into 11 steps from 0 to 24 and theta is from 0 to 1 with 20 steps.

Dose 220x35

r 220x35

z 220x11

theta 220x20

I tried the following:

surf(r,z,theta,dose)
colorbar

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Answer 1

Naman Chaturvedi 2019-1-21

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https://ww2.mathworks.cn/matlabcentral/answers/440448-mesh-plot-from-data-points#answer_357254

在 MATLAB Online 中打开

Hi Garret,

To use surf(x,y,z), x, y and z should be matrices of the same size.Also, as you may know, the x, y and z are from the cartesian coordinate system. So, you would have to convert your cylindrical coordinates to cartesian coordinates.

>> surf(R.*cos(PHI), R.*sin(PHI), Z);

Refer to this MATLAB answer link to help yourself : https://www.mathworks.com/matlabcentral/answers/53954-how-do-you-create-a-surf-plot-in-cylindrical-coordinates

Also, go through the surf documentation: https://www.mathworks.com/help/matlab/ref/surf.html