How to create a 2D line plot animation

I have a double array of 2001 values which is recorded from SImulink in 20 seconds. When I try to create a video animation of the graph plotting, I get an output of 1:06 minutes. Is there a way to create an animation that would correlate to the original 20 seconds and save it as an mp4 file directly? Here is my code:

load("test1.mat");

video = VideoWriter('test1','MPEG-4');
open(video)

curve = animatedline('Color','r');
set(gca, 'XLim', [0 2001],'YLim', [-200 200])
grid on

for i=1:2001   
    addpoints(curve,i ,val(i));
    drawnow 
    writeVideo(video,getframe(gcf));    
end

close(video);

Answer 1

[Jimmy Neutron]

It is a matter of frames per second - as the recording were done at a sample rate of 0.01, the fps was set to 100. Here is te code:

load("test1.mat");

video = VideoWriter('test1','MPEG-4');
video.FrameRate = 100;
open(video)

curve = animatedline('Color','r');
set(gca, 'XLim', [0 20],'YLim', [-200 200])
grid on

for i=1:2001
    addpoints(curve,i*0.01 ,val(i));
    drawnow
    writeVideo(video,getframe(gcf));    
end

close(video);