How can I make a 3d

Hello everyone, I have had problems when making a 3d plot for different rectangular pulses, in the 'y' axis the amplitude should go in voltage, in the 'x' axis the time, finally in the z axis the samples. I have searched for information but have not been able to find a good source.

Answer 1

[Star Strider]

There are several ways to do that. One is to use the plot3 funciton, another is the waterfall function.

t = linspace(0,5);
s = sin((1:6).'*2*pi*t/5);

figure
hold on
for k = 1:size(s,1)
    plot3(t, ones(size(t))*5*k, s(k,:))
end
hold off
grid on
view(50,50)

Experiment with your own data.

.

[Star Strider]

My code only plots data.

The ‘s’ variable is a matrix, and my code plots each row, since that is how I wrote it.

Your data has a ‘Time’ column vector and a ‘Voltaje’ column vector, so to plot it in 3D, the code would be something like this:

figure

plot3(Time, ones(size(Time)), Voltaje)

grid on

view(50,50)

Make appropriate changes to get the result you want.

If you have a ‘Voltaje’ matrix with each signal a column vector, my code would change to:

figure

hold on

for k = 1:size(s,1)

plot3(Time, ones(size(Time))*5*k, Voltaje(:,k))

end

hold off

grid on

view(50,50)

This would plot the columns individually, similar to what my code plots. Note that this version addresses the columns of the ‘Voltaje’ vector rather than the rows of my original code.

.

[David]

OK thank you. And how can I leave the graphs separated by a unit on the z axis? Separated as samples, for example, I have 4 graphs and I want them to be separated by a unit on the z axis.

[Star Strider]

These are separated on the y-axis, and they are separated arbitrarily by 5 units. That is the purpose of the ones call in the plot loop. (Separating them on the z-axis would separate them vertically, however that is not what the original plot in your question demonstrated.) The position of the ones call in the plot3 call argument list controls the axis on whcih they are separated, so experiment to get the result you want.

[Star Strider]

You will need to do something like this —

Timem = cat(2,Time12, Time2,Time3,Time4); % Concatenate To Matrix

Voltajem = cat(2, Voltaje1,Voltaje2,Voltaje3,Voltaje4); % Concatenate To Matrix

figure

hold on

for k = 1:size(s,1)

plot3(Timem(:,k), ones(size(Timem,1))*k, Voltajem(:,k))

end

hold off

grid on

xlabel('Time (ns)')

ylabel('Sample')

zlabel('Ampliitude (a.u.)')

view(50,50)

That should get you started.

See the documentation on plot3 for details.

.

[David]

OK thank you. What I don't understand is that I am not using the variable 's' at any time, in your code this variable corresponded to a sine that varied with respect to time, but I am not using that sine.

[Star Strider]

I created the ‘s’ matrix to illustrate the approach, since I do not have your data.

Use the code I previously posted instead:

Timem = cat(2,Time1,Time2,Time3,Time4);                             % Concatenate To Matrix
Voltajem = cat(2, Voltaje1,Voltaje2,Voltaje3,Voltaje4);             % Concatenate To Matrix

figure
hold on
for k = 1:size(s,1)
    plot3(Timem(:,k), ones(size(Timem,1))*k, Voltajem(:,k))
end
hold off
grid on
xlabel('Time (ns)')
ylabel('Sample')
zlabel('Ampliitude (a.u.)')
view(50,50)

Before you run it, be sure that all the appropriate ‘Time’ and ‘Voltaje’ vectors are in your workspace, and defined above (before) my code in your script.

.

[Star Strider]

I have no idea what you are doing.

I got the impression that you have 4 (100000x1) vectors each for the independent and dependent variables. My code concatenates them into 2 (100000x4) matrices. That should be well within the ability of your computer to do.

Instead, you appear to be multiplying one of the vectors by its transpose.

[David]

I am using exactly the same code:

t = linspace(0,5);
s = sin((1:6).'*2*pi*t/5);
Timem = cat(2,Time1,Time2,Time3,Time4);                             % Concatenate To Matrix
Voltajem = cat(2, Voltaje1,Voltaje2,Voltaje3,Voltaje4);             % Concatenate To Matrix
figure
hold on
for k = 1:size(s,1)
    plot3(Timem(:,k), ones(size(Timem,1))*k, Voltajem(:,k))
end
hold off
grid on
xlabel('Time (ns)')
ylabel('Sample')
zlabel('Ampliitude (a.u.)')
view(50,50)

[Star Strider]

That demonstration code is not appropriate for your data.

Use this instead:

Timem = cat(2,Time1,Time2,Time3,Time4);                             % Concatenate To Matrix
Voltajem = cat(2, Voltaje1,Voltaje2,Voltaje3,Voltaje4);             % Concatenate To Matrix

figure
hold on
for k = 1:size(s,1)
    plot3(Timem(:,k), ones(size(Timem,1))*k, Voltajem(:,k))
end
hold off
grid on
xlabel('Time (ns)')
ylabel('Sample')
zlabel('Ampliitude (a.u.)')
view(50,50)

.