How to plot a data in spherical coordinates?

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Jagadeesh Korukonda 2022-8-16

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1780220-how-to-plot-a-data-in-spherical-coordinates

评论： Jagadeesh Korukonda 2022-8-17

采纳的回答： David Hill

data.mat

Let me explain, what I'm actually solving.

I'm solving Diffusion-Reaction equation(2D) in spherical coordinates(axis-symmetric case).

I'm solving this equation numerically. So at the end I'm getting

, r, θ.

So I want to plot this function

in r and θ plane instead of

palne

I'm attaching data.mat file to this question

Can anyone help in this regard?

Thanks in advance.

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采纳的回答

David Hill 2022-8-16

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1780220-how-to-plot-a-data-in-spherical-coordinates#answer_1027495

在 MATLAB Online 中打开

[x,y,z]=sph2cart(th,conc,r);
surf(x,y,z);

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Torsten 2022-8-16

编辑：Torsten 2022-8-16

在 MATLAB Online 中打开

If you solve the equation in r and theta, you also get the solution C in r and theta. So plotting in the r-theta plane would simply mean

[R,THETA] = ndgrid(r,theta);
surf(R,THETA,C)

where C(i,j) = C(r(i),theta(j)).

So you plot over a rectangle with x-axis r and y-axis theta (0<=r<=R, 0<=theta<=2*pi).

If you want to plot in the x-y-plane (thus over the circle with radius R), you must convert to x and y coordinates via x = r*cos(theta), y= r*sin(theta).

Jagadeesh Korukonda 2022-8-17

Thanks @Torsten

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