Plot 3D points in Matlab

Question

I want to plot 3D points in Matlab in different colors depending on a value. I've got following code, but this does not work because plot3d needs a vector.

x = vdhf_data.data(:,1);
y = vdhf_data.data(:,2);
z = vdhf_data.data(:,3);
data = vdhf_data.data(:,4);

grid on
hold all

for k=1:length(x)
    if data(k) < 6  
        plot3d(x(k), y(k), z(k), 'ws--', 'MarkerEdgeColor', 'r', 'MarkerFaceColor', 'r')
    else
        plot3d(x(k), y(k), z(k), 'ws--', 'MarkerEdgeColor', 'g', 'MarkerFaceColor', 'g')
    end
end

How to do that in Matlab?

zellus · Accepted Answer · 2012-02-23 17:09:54Z

10

I would use

scatter3(x,y,z,ones(size(x)),data,'filled')

This will plot all the points at the same size and color them according to the value of data, using the current colormap. You can also use data to scale the size of each point.

scatter3(x,y,z,data.^-2,data,'filled')

edited Feb 23, 2012 at 17:09

zellus

9,5825 gold badges41 silver badges58 bronze badges

answered Feb 23, 2012 at 14:18

zamazalotta

4331 gold badge6 silver badges11 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

yuk Over a year ago

I believe instead of ones(size(x)) the size vector in scatter3 can be scalar value for the same size or an empty ([]) for default size.

Razer Over a year ago

Yes there can be a scalar. I only want to have two markercolors. Is there a possibility to add this in one line instead of a loop?

zamazalotta Over a year ago

You will just need to adjust your colormap. So for two colors (red & blue)you will do something like this colormap([ones(50,1)*[1 0 0]; ones(50,1)*[0 0 1]]) This will make the color division in the middle of the data range. If you want it to be at a specific number you have to scale the ones(n-a,1) ones(n+a,1) accordingly

Collectives™ on Stack Overflow

Plot 3D points in Matlab

1 Answer 1

3 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

3 Comments

Your Answer

Sign up or log in

Post as a guest

Related