Animated 3D Scatter Plot

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Fabio Taccaliti
Fabio Taccaliti 2022-4-20
评论： Star Strider 2022-4-20
Hello,
I would like to create an animated 3D scatter plot that is plotting the points included in the sub-array of a cell DD (102x1 cell), each sub-array is a 29x4 (where the last three column are the 3 coordinates (x,y.z)). Here below an example of my cell and sub-array.
M = [[0;0.2;0.2;0.4;0.6;0.6;0.6],rand(7,3)]
D = diff(find([1;diff(M(:,1));1]));
DD = mat2cell(M,D,4);
DD{:}
The animated scatter should display together each subarray points and then in a subsequent time step the next subarray points.
Here below the code that alreay plot all the points together.
figure(1)
for i = 1:numel(DD)
hold on; grid on; grid minor; axis equal;
set(gcf, 'Color', 'White');
set(gca, 'Fontsize', 12);
set(gca, 'ZDir','reverse')
scatter3(DD{i}(:,2),DD{i}(:,3),DD{i}(:,4))
view(3)
xlabel('x [mm]')
ylabel('y [mm]')
zlabel('z [mm]')
end
Thanks in advance

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采纳的回答

Star Strider
Star Strider 2022-4-20
Try this slightly augmented version —
figure(1)
hold on
grid minor
axis([0 2 0 2 0 2])
for i = 1:numel(DD)
view(3)
set(gcf, 'Color', 'White');
set(gca, 'Fontsize', 12);
set(gca, 'ZDir','reverse')
scatter3(DD{i}(:,2),DD{i}(:,3),DD{i}(:,4))
grid on
axis([0 2 0 2 0 2])
drawnow
pause(0.25)
xlabel('x [mm]')
ylabel('y [mm]')
zlabel('z [mm]')
end
hold off
It fixes the axis limits and adds drawnow and pause to create the animation.
Experiment to get the desired results.
.
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Fabio Taccaliti
Fabio Taccaliti 2022-4-20
Thanks a lot, now it works :)
Star Strider
Star Strider 2022-4-20
As always, my pleasure!

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更多回答（1 个）

Steven Lord
Steven Lord 2022-4-20
Rather than recreating the scatter plot each time, I'd apply the first of the techniques listed on the Animation Techniques documentation page. If I ran this in MATLAB Answers you wouldn't see the animation, but if you run it in MATLAB you can.
% Sample data
theta = 0:15:360;
x = cosd(theta);
y = sind(theta);
% Create the initial "frame" of the animation
h = scatter(x, y, 'o');
% Control the axes so at its "widest" the whole circle still fits
axis([-5 5 -5 5])
% Make it look circular
axis equal
% At each frame, push each point outward (or pull it inwards)
for r = repmat([1:5 4:-1:2], 1, 10)
% Update the existing object's properties rather than creating a new one
h.XData = r*x;
h.YData = r*y;
% Let you see the animation
pause(0.1)
end
In the "real" animation you might want to use one of the options for drawnow instead of pause.

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