How to plot function part by part?

So I want to set duration of plotting y=sin(t) to 10 seconds, but to plot it part by part every 2 seconds. So that means every 2 seconds plotting should be 'updated'.

I want to see how this work with basic function, because I want to apply it on plotting graph of winsound(sound card). It will also durate 10 seconds, and I need to update it every n seconds. So it is easier for me to see how this works on simple function such as sin(t). I hope you understood what I want to do, and I would be thankful if someone could solve my problem :)

[Walter Roberson]

animatedline() . Every 2 seconds addpoints() and drawnow()

[Faris Hajdarpasic]

Can you paste code? I dont understand how to display it every 2 seconds

[Walter Roberson]

outline:

while there is more to do
addpoints(....)
pause(2)
end

[Faris Hajdarpasic]

But my action should be 10 seconds long. Is that what I should do in this "there is more to do"? I mean if duration is 10 seconds and every 2 sec I need to display part, I should run loop five times, and every time 1/5 of length should be displayed. Thats the point. So I can make it work like this?

Answer 1

[Walter Roberson]

duration = 10;
Fs = 20;   %samples per second
secs_per_plot = 2;

data = randi([-5 5], 1, duration*Fs);     %example data for illustration

t_cols = reshape((0:Fs*duration-1)/Fs, Fs*secs_per_plot, []);
data_cols = reshape(data, Fs*secs_per_plot, []);

%the work
h = animatedline();
for K = 1 : size(data_cols,2)
    addpoints(h, t_cols(:,K), data_cols(:,K));
    drawnow();
    pause(secs_per_plot);
end

[Faris Hajdarpasic]

It has error in line 9(you forgot underscore but it doesent work again)

[Walter Roberson]

I have repaired the code, above.

[Faris Hajdarpasic]

Now it works, but where is sinus? (it gives me some wierd shapes)

Sorry I am begginer, just started MATLAB

[Walter Roberson]

The data I show is example data. You should replace it with your actual data.

I am not going to post the code because you are working on homework and you need to work out something yourself.

[Faris Hajdarpasic]

I have been trying for whole day, this is why I asked cuz i couldnt figure it out.But thanks anyway

[Walter Roberson]

t_cols is already time in fraction of a second. Consider sin(2*pi*F*t) where F is the frequency of the sine wave and t is time in seconds.