How can I add colors on my 3D scatter plot ?

Question

Louis THOMAS 2020-1-8

1
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/499521-how-can-i-add-colors-on-my-3d-scatter-plot

编辑： Adam Danz 2020-8-28

采纳的回答： Adam Danz

在 MATLAB Online 中打开

Hi,

I have three vectors (listeX, listeY, listeCycles). I want to plot using scatter3() function.

It results in this chart:

I would like to color in different colors the points on the vertical axis Z, according to their Z-coordinate.

For instance, having red for the bottom data, green for medium and blue for the data above.

Here is my code . Thank you very much !

figure
scatter3(listeX,listeY,listeCycles,'MarkerEdgeColor','k','MarkerFaceColor',[0 .75 .75])
xlabel('Temps ouverture minimum (s)');
ylabel('deadband (°)');
zlabel('Nombre de cycles sur projection 10 000s');

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Answer 1

Adam Danz 2020-1-8

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/499521-how-can-i-add-colors-on-my-3d-scatter-plot#answer_409294

编辑：Adam Danz 2020-8-28

在 MATLAB Online 中打开

Specify color from scatter3()

You can specify the color of each point when you call scatter3(X,Y,Z,S,C) or by using the property-value, scatter3(X,Y,Z,. . .,'MarkerFaceColor',C) where C is an n-by-3 matrix of RGB value, one row for each point.

Specify color using the scatter object handle

Alternatively, you can specify the color after plotting by setting the CData property as an n-by-3 matrix of RGB values.

h = scatter3(. . ., 'filled'); 
h.CData = C; 

Creating the RGB matrix

One simple way to create the RGB color matrix is to use one of Matlab's colormaps and specify the number of points. This example uses jet and inputs the number of values in the first input to scatter3, X. See this list for other built-in colormaps.

C = jet(numel(X));

To add a colobar,

set(gca, 'colormap', C)
colorbar()

Full Demo

figure
[X,Y,Z] = sphere(16);
x = [0.5*X(:); 0.75*X(:); X(:)];
y = [0.5*Y(:); 0.75*Y(:); Y(:)];
z = [0.5*Z(:); 0.75*Z(:); Z(:)];
h = scatter3(x,y,z,'filled','MarkerEdgeColor','k');
axis equal
box on
C = jet(numel(x));
h.CData = C
set(gca, 'colormap', C)
colorbar()