Output a video in MATLAB

I'm attempting to make a video of my plot in MATLAB and when I run it, the output plot is just blank and it doesn't show anything but the code still runs. Any feedback?

for t = 2:100001
time=(t-2)*dt;
f=a0*sin(time/(2*pi)); 
massspring(:,t) = VibrationPosition(massspring(:,t-1), time, a0, pi,  m, k, c, f, dt, n);
drawnow
F(t) = getframe(gcf);
end
video = VideoWriter('Helix.avi','Uncompressed AVI');
open(video)
writeVideo(video,F);
close(video)
figure(1);
plot(t3, massspring(1,:), t3, massspring(2,:));
xlabel('Time (s)')
ylabel('x_1(t), x_2(t)')
title('Timestep 0.01')
title('Mass Position and Velocity over time')
legend('Mass Position','Mass Velocity')

Answer 1

[Sudheer Bhimireddy]

Try this

video = VideoWriter('Helix.avi','Uncompressed AVI');
open(video);

h=figure(1);
hold on;
for t = 2:100001
    % Do your stuff
    plot();
 
    F = getframe(gcf);
    writeVideo(video,F);
end
% Once you have all the timesteps plotted then close the videwriter
close(video);

[Marios Christofides]

I got this error

Cannot create file Helix.avi. Permission Denied.

[Sudheer Bhimireddy]

Double-check the file and folder permissions in the directory you are trying to save the video file. If a file already exists with the same name, try renaming the file and check if you are still getting the error.

Also, where are you trying to save the file? It is better to save it in a directory created by you rather than MATLABs directory.

[Marios Christofides]

I changed the directory but the original problem still persists except the axis are showing but nothing is being plotted.

[Sudheer Bhimireddy]

So, are you not getting the "permission denied" message anymore?

If you are able to see the axis and labels and title etc., then the problem might be with the data itself or you are restricting the axis limits so that the data is not in the visible window. Try setting

xlim([-inf inf]);
ylim([-inf inf]);

Also try with only one timestep and check. Also, check if your data has NaN values.