CODEWITHSUNDEEP
matlabplotmatlab-figurescatter3d
Sam
Sam

Reputation: 63

How to mark a point (I have x,y,z for it) in a 3D big data scatter plot with different color using matlab?

I have two 3D volume images and I want to locate one point from the first image (I have specific x, y, and z values for this point) and mark it with a different color. I mean how I can insert the values of x, y, and z and get this point in my graph inside all the points with a different color.

Upvotes: 2

Views: 349

Answers (2)

EBH
EBH

Reputation: 10450

Here are 2 options:

Option 1

Use hold to overlay another scatter only with the points you want to color differently:

data = rand(100,3); % some data
p = randi(100); % choose some point
scatter3(data(:,1),data(:,2),data(:,3),'Fill')
hold on
% here you plot only one point (p):
scatter3(data(p,1),data(p,2),data(p,3),'r','Fill')
hold off

enter image description here

Option 2

If you want to color more than one point, and/or use different colors for your points, it may be better to set the color by the point when you call scatter in the first time:

data = rand(100,3); % some data
p = randi(size(data,1),5,1); % choose some points
c = ones(size(data,1),1); % default color
c(p) = 2:(numel(p)+1); % set different color for each points in p
col = lines(numel(p)+1); % set the colormap for the points
scatter3(data(:,1),data(:,2),data(:,3),[],col(c,:),'Fill')

enter image description here

Upvotes: 1

Dandan
Dandan

Reputation: 143

Assuming you're using scatter3, you can just make your scatterplot, then use "hold on" and add a scatterplot with your single point in a different color that will cover the original point, e.g.: 

hold on; 
scatter3(x,y,z,'MarkerEdgeColor','k','MarkerFaceColor',[0 .75 .75]);

Upvotes: 1

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