Seal a cylinder in a scattered plot

Hello all,

I have a scattered plot superimposed with a cylinder.

I wish to seal the ends of the cylinder.

Below is my interial code:

% A = load ('Data.txt');
A = 0.05*rand(8, 4)

A = 8×4

0.0349 0.0346 0.0168 0.0010 0.0342 0.0018 0.0060 0.0277 0.0224 0.0196 0.0081 0.0192 0.0382 0.0010 0.0373 0.0112 0.0053 0.0472 0.0435 0.0414 0.0169 0.0343 0.0157 0.0332 0.0256 0.0187 0.0223 0.0390 0.0488 0.0216 0.0233 0.0211

x = A (:,1 ) ;
y = A (:,2 ) ;
z = A (:,3 ) ;
Amplitude = A (:,4) ; 
scatter3 (x , y, z, 30, Amplitude )
title ('Cylinderical Sample')
xlim ([-0.07 0.07])
ylim ([-0.09 0.09])
zlim ([0 0.10])
xlabel ('Breath /m')
ylabel ('Width /m')
zlabel ('Height /m')
pbaspect([1 1 2])
H = colorbar ;
ylabel (H, 'Amplitude')
hold on
r = 0.025;
[X,Y,Z] = cylinder(r);
surf (X,Y,Z, 'EdgeColor', 'none', 'FaceAlpha', 0.2);

Here are the results from the top view:

Is it possible that I can please get some assistance with sealing the ends of the cylinder?

Thank you.

Answer 1

[Les Beckham]

Try this (I'm skipping the scatter portion for this example and assuming that you want the 'caps' that seal the ends to have the same color as the cylinder).

First replace your last 3 lines with this

r = 0.025;
[X,Y,Z] = cylinder(r);
hsurf = surf (X,Y,Z, 'EdgeColor', 'none', 'FaceAlpha', 0.2); % capture the handle of the surf object

Then, to add the 'caps' on the end of the cylinder:

patch(X(1,:),Y(1,:),Z(1,:), hsurf.CData(1,:), 'FaceAlpha', 0.2)
patch(X(1,:),Y(1,:),Z(2,:), hsurf.CData(1,:), 'FaceAlpha', 0.2)

Add the 'EdgeColor', 'none' option if you don't want the edges of the 'caps' to show.

[Greek McCoy]

Hello Les Beckham,

Thank you very much for your answer.

My code works just as I want it now.

[Les Beckham]

You are quite welcome.