how to color my scatter3 values according to a cluster label

hi guys, so i am stuck on coloring my xyz values separately while using the scatter3 func.

so i have this code

load('../mat/coor.mat')                          % where the coor nodes are stored
x = coor(:,1);                                   % correspond xyz to values on coor
y = coor(:,2);
z = coor(:,3);
scatter3(x,y,z,100); 

where i correspond my xyz values to the values on my coor file and then i make a scatter3 plot of those values.

My next step is to color these xyz values according to my specific cluster labels that are stored in a separate matrix titled 'ciu' which is a 384x1 matrix with k=1,2, and 3. How would I go about doing that?

Any help would be appreciated, thank you so much!

Edit: more background

So coor.mat is a 384x3 matrix, meaning that coor.mat line 1 directly corresponds to ciu-matrix line 1. For example, (x1,y1,z1) = 1, (x2,y2,z2) = 3, etc.

What I want to do is to write a line that has matlab make that connection and then assign each of the three cluster labels their own color on the plot generated via scatter3.

Answer 1

[Ameer Hamza]

See gscatter: https://www.mathworks.com/help/releases/R2019b/stats/gscatter.html

gscatter(x,y,z,ciu);

[Riya Patel]

hi, for the project im doing, i can't really use gscatter, i've been instructed to stick to scatter3.

[Ameer Hamza]

Are the elements of ciu integers corresponding to the cluster number?

[Riya Patel]

yess, they do. sorry i just rememered that, i'll add it in to the original post. But yes, line 1 on coor.mat corresponds with line 1 on ciu. So ex. (x1,y1,z1) = 1, (x2,y2,z2) = 3, etc.

[Ameer Hamza]

In that case, you can try something like this

load('../mat/coor.mat')                          % where the coor nodes are stored
x = coor(:,1);                                   % correspond xyz to values on coor
y = coor(:,2);
z = coor(:,3);
colors = rand(length(unique(ciu)), 3); % generate random rgb triples
                                       % according to the number of clusters
Colormap = colors(ciu, :);
scatter3(x,y,z,100,Colormap);

[Riya Patel]

yayy that works! Thank you so much!

[Ameer Hamza]

Glad to be of help.