How do I make a video plot with multiple line that appears as it plots?

I have the following code:

writer_obj = VideoWriter('ms_GMD_video','MPEG-4');
    open(writer_obj);
    
    % parameters
    x = 1:size(GMD,2);
    ms_1 = GMD(1,x);
    ms_2 = GMD(2,x);
    ms_3 = GMD(3,x);
    ms_4 = GMD(2,x);
    ms_5 = GMD(5,x);
    
    % create plotting figure
    fig1 = figure(1);
    
    
    % loop over all timepoints
    for i = 1:length(x)
    
        plot(x(i),ms_1(i))
        hold on
        plot(x(i),ms_2(i))
        hold on
        plot(x(i),ms_3(i))
        hold on
        plot(x(i),ms_4(i))
        hold on
        plot(x(i),ms_5(i))
        hold on
        axis([1 500 min(GMD,[],'all') max(GMD,[],'all')])
        title('Dissimilarity Score')
        
        F = getframe(fig1);
    
        writeVideo(writer_obj, F);
    
    end
    
    close(writer_obj)
    

GMD is the input, and contains five lines that I would like to plot on a graph that changes over time.

I currently have it so that we only look at the first 500 time points as an example clip, which is fine.

But when I run this, there are no lines appearing on the graph.

Any help would be appreciated, thank you.

Answer 1

[Antoni Garcia-Herreros]

Hello David,

It would be easier if you attached the the different variables (GMD, x, ms,...) as a .mat file.

The reason why the plot is not showing is because you are plotting single values with a LineStyle: '-'.

You could try something like this:

x=[0:0.1:pi];
writer_obj = VideoWriter('ms_GMD_video','MPEG-4');
open(writer_obj);
fig1=figure(1);
for i=2:length(x)
    plot(x(i-1:i),sin(x(i-1:i)),'r')
    hold on
    plot(x(i-1:i),cos(x(i-1:i)),'b')
    pause(0.1)
    ylim([-1 1])
    xlim([0 pi])
    F = getframe(fig1);
    writeVideo(writer_obj, F);
end
close(writer_obj)