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Hi,

I have a . txt with 4 colums : time (t), x, y, z which is the x, y, z position of an object according to the time.

I would like to plot the 3D position of this object.

% Data (10)

t= [0,513819900000000

1,01409700000000

1,53027800000000

2,04589800000000

2,54634500000000

3,11879600000000

3,62982200000000

4,14455800000000

4,65201000000000

5,15476100000000]

x=[0,0144918600000000

0,0197000400000000

0,0212137600000000

0,00879137000000000

-0,0430479900000000

-0,173410000000000

-0,293167400000000

-0,315159100000000

-0,306979900000000

-0,291601800000000]

y=[0,0624466500000000

0,0602231400000000

0,0604935700000000

0,0402826200000000

-0,00244453500000000

0,0134661700000000

0,0535583300000000

0,0605951400000000

0,0840618800000000

0,0692208900000000]

z=[0,0765380100000000

0,0890338800000000

0,104488400000000

0,122371500000000

0,181203300000000

0,0617616700000000

-0,0800978800000000

-0,174215400000000

-0,175980100000000

-0,137890000000000]

% Subplot of the deplacement

figure;

subplot(1,3,1); plot(t,x); title ('X to time');

subplot(1,3,2);plot(t,y); title ('Y to time');

subplot(1,3,3);plot(t,z); title ('Z to time');

% 3 plots in 1 figure

figure;

plot3(x,y,z)

hold on

scatter3(x,y,z,[],t,'filled')

box on

grid on

Can I make another plot, more representative of the deplacement or not?

Thank you very much.

AL

Luna
on 28 Jan 2019

The data you have provided is not understandable.

Why all x y z and t have 2 columns? (10x2 double array). Can you attach .txt file instead?

Luna
on 29 Jan 2019

Edited: Luna
on 29 Jan 2019

Hello Anne,

I tried couple of things on your code and change the subplots into vertical instead of horizontal. Looks better.

I have added start and finish points with its legend to see the deplacement of the circles. But in 3D plot it looks very chaotic. I have added rotate3d on so when you right click on the plot go to X-Z view which is the best showing trajectory. I recommend this.

The second and third thing I have tried to put arrows from one point to next point but 136 points are too much so it looked very complex. I don't recommend this.

Also for animation you can use comet3 function. I recommend this to you to understand how your data moves from one to another point.

Please don't forget to read the comments inside the code. Hope those would be helpful.

tableData = readtable('LogPosition.txt');

t = tableData.temps_s_;

x = tableData.x_m_;

y = tableData.y_m_;

z = tableData.z_m_;

% Subplot of the deplacement

figure;

subplot(3,1,1); plot(t,x); title ('X to time'); ylabel('X');

subplot(3,1,2);plot(t,y); title ('Y to time'); ylabel('Y');

subplot(3,1,3);plot(t,z); title ('Z to time'); ylabel('Z');

xlabel('Time');

% 3 plots in 1 figure

figure;

plot3(x,y,z,'-b');

hold on

plot3(x,y,z,'co','LineWidth',0.5);

% plots start point:

plot3(x(1),y(1),z(1),'*g','LineWidth',5);

%plots end point:

plot3(x(end),y(end),z(end),'*r','LineWidth',5);

% add legend:

legend({'Trajectory','Points','Start Point','Finish Point'});

% some axis properties:

box on

grid on

xlabel('X');

ylabel('Y');

zlabel('Z');

title('Object Position');

% Best way is X-Z view.

rotate3d on;

% Best way is X-Z view.

%%%%%%%%%%%%%% This Section written for demo %%%%%%%%%%%%

%% comet3 Function Demo (Working very well)

figure;

comet3(x,y,z);

%% mArrow3 Function Demo (May not be working very well) looks bad.

Array = [x,y,z];

for i = 1:size(Array,1)-1

mArrow3(Array(i,:),Array(i+1,:),'stemWidth',0.0002,'facealpha',0.5,'tipWidth',0.005);

end

%% Or quiver3 Function Demo (May not be working very well, I could not make it work)

quiver3(x,y,z,u,v,w,S,'Color','k');

rotate3d on

Anne-Laure GUINET
on 30 Jan 2019

Luna
on 30 Jan 2019

Your welcome :)

Please use "comment on this answer" section instead of posting an answer.

u v w should be defined for quiver3 but I have never done that before.

If the answer works for you, please accept the answer :)

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