I know this is a very old question, but perhaps it will still help someone. The above answer should work (although the line sample_rate = sample_rate+i ; doens't seem to do anything since it's within an if-statement for when i==0.) Anyway, it keeps the previous data on screen. If you use NaN for every 51st value, there will be a gap between the 50th and 52nd points. That way, the amount of animatedline objects in the figure won't keep going up, as instead you'll keep using the same one. This, however, also means that old points will be automatically overwritten, which might or might not be desirable. This would look like:
:
clear
sample_rate = 50;
x = 0:sample_rate-1;
figure
h=animatedline('MaximumNumPoints',sample_rate);
axis([0 sample_rate 0 1])
i = 0;
k = 0;
while true
i = 1 + i;
received_data = rand;
addpoints(h,x(i),received_data);
if mod(i,sample_rate) == 0
addpoints(h,x(i)+1,NaN);
end
drawnow
i = mod(i, sample_rate);
k = k+1;
if k == 10*sample_rate
break
end
end
