MATLAB: How to create and assign custom color scheme per value on a scatter3 plot

colorcustomgraphplotscatterscatter3

Plotting a path of latitude, longitude and altitude using scatter3, I want to assign a color scheme for each point based on its air temperature. How do I create a color gradient from the max/min temperatures values and automatically fill in the rest? Thank you.

Best Answer

That seems to be described in the documentation for scatter3:

scatter3(X,Y,Z,S,C) draws each circle with the color specified by C.

If C is a vector with length equal to the length of X, Y, and Z, then the values in C are linearly mapped to the colors in the current colormap.

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MATLAB: How to do 3d color gradient plot

Hi Teerapong,

It is my understanding that you want to plot 3D coordinates (x,y,z) having color as per the value of k.

For this use scatter3 function. (Refer to documentation provided as hyperlink for more information.)

c = k; % color of circles
scatter3(x,y,z,s,c = k) % s is size of circles and x, y, z are the coordinates

Here c can be a vector or three-column matrix of RGB triplets.

If k is a vector of length equal to x, y, z then the values of c (or k) are linearly mapped to the colors in the current colormap.

MATLAB: Color based on values from a matrix.

This seems to color them correctly:

M = [randperm(20)', randperm(20)', randi(1000, 20,1)];
figure
scatter(M(:,1), M(:,2), 50, M(:,3), 'Filled')
colormap(jet(size(M,1)))
grid on

Also, it depends on the colormap (link) you are using. The jet (link) function (that I use here) colors them about the way you want.

Best Answer

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MATLAB: How to do 3d color gradient plot

MATLAB: Color based on values from a matrix.

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