Create Lines and Add Points

Create two animated lines of different colors. Then, add points to the lines in a loop. Set the axis limits before the loop so that to avoid recalculating the limits each time through the loop. Use a drawnow or drawnow limitrate command to display the updates on the screen after adding the new points.

a1 = animatedline('Color',[0 .7 .7]);
a2 = animatedline('Color',[0 .5 .5]);

axis([0 20 -1 1])
x = linspace(0,20,10000);
for k = 1:length(x);
    % first line
    xk = x(k);
    ysin = sin(xk);
    addpoints(a1,xk,ysin);

    % second line
    ycos = cos(xk);
    addpoints(a2,xk,ycos);

    % update screen
    drawnow limitrate
end

The animation shows two lines that grow as they accumulate data.

Query Points of Line

Query the points of the first animated line.

[x,y] = getpoints(a1);

x and y are vectors that contain the values defining the points of the sine wave.