Export Animated Line Plots as a Video in MATLAB

Creating an animated line plot and exporting it as a video could be done in the following steps:

1. Let's create three signals first with 60-degree phase differences

clear all;

clc;

x = linspace(0,4*pi,500);

y1 = sin(x);

y2 = sin(x-pi/3);

y3 = sin(x+pi/3);

2. Now let's create objects of animatedline() 

signal_1 = animatedline('Color', 'b', 'LineStyle', '-', 'LineWidth', 1) ;

signal_2 = animatedline('Color', 'r', 'LineStyle', '-', 'LineWidth', 1) ;

signal_3 = animatedline('Color', 'g', 'LineStyle', '-', 'LineWidth', 1) ;

3. Run the program in a loop and plot each points also grabbing frames in a cell

for i = 1 : length(x)

    addpoints(signal_1, x(i), y1(i));

    addpoints(signal_2, x(i), y2(i));

    addpoints(signal_3, x(i), y3(i));

    drawnow

    frames{i} = getframe(gcf) ;

end

4. Create a video writer object and write each frames

obj = VideoWriter('Signals.avi');

obj.Quality = 100;

obj.FrameRate = 40;

open(obj);

for i = 1:length(x)

    writeVideo(obj, frames{i}) ;

end

obj.close();

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Download MATLAB code for exporting animated plot as a video

MATLAB Code