How to do the 3D vector plot from dataset?

Question

Nanthanon Visitpongaree 2019-2-21

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/446325-how-to-do-the-3d-vector-plot-from-dataset

评论： Cris LaPierre 2020-8-4

11x11x11 in 3D.xlsx

I want to plot like (picture) this but I don't know what I did wrong with my code. Using the data set in excel file (in the attachment).

In Excel file, The first 3 columns are the position in x, y, z axes and the last 3 columns are the magnetic field in x, y, z axes as Bx, By and Bz.

Each arrows that shown in the 3D graph are the magnitude of magnetic field :

MagB = sqrt(Bx^2+By^2+Bz^2)

Thank you very.

clear all;
close all;
L1 = xlsread('11x11x11 in 3D.xlsx');
N1=11;     
N2=11;
N3=11;
l = 1;
for i = 1 : 1 : N1
  for j = 1 : 1: N2 
      for k = 1 : 1 : N3
    l = (i-1)*N2*N3+((j-1)*N3+k);
    X(k,j,i)  = L1(k, 1);
    Y(k,j,i)  = L1(k, 2);
    Z(k,j,i)  = L1(k, 3);
    X1(k,j,i)  = L1(k, 4);
    Y1(k,j,i)  = L1(k, 5);
    Z1(k,j,i)  = L1(k, 6);
      end
  end 
end 
quiver3(X,Y,Z,X1,Y1,Z1)

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Answer 1

Cris LaPierre 2019-4-9

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/446325-how-to-do-the-3d-vector-plot-from-dataset#answer_369679

在 MATLAB Online 中打开

Here's the code that will load and plot the data.

opts = detectImportOptions("11x11x11 in 3D.xlsx");
opts.VariableNames = {'X','Y','Z','Bx','By','Bz'};
data = readtable('11x11x11 in 3D.xlsx',opts);
quiver3(data.X,data.Y,data.Z,data.Bx,data.By,data.Bz)

I don't know what you are trying to do with your code. The plot you get with my code will not look like the image you've shared. You should take a look at your data if you don't understand why.

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Daynah Rodriguez 2020-8-4

编辑：Daynah Rodriguez 2020-8-4

Hey Cris,

I used this same code to plot Jupiter's magnetic field (Bx,By,Bz) from Juno's XYZ position. Is this a correct representation of it?

Cris LaPierre 2020-8-4

I can't see anything wrong with your plot, but I do not have enough background in the magnetic fields of Jupiter to be able to tell you if it is correct or not.

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