How to update a plot/graph?

Hello everybody,

I got a plot like this one:

h = subplot(1,2,1);
plot(0, 0);
axis([-30 40 -20 100 ]);
grid on

Now I am getting a new array of x,y - points every second. How can I update the subplot h with these arrays? It is an n by 2 single array.

Thank you in advance!

Lucca

Answer 1

[Image Analyst]

In your loop where you get new x,y arrays, make sure you have this line after the plot:

plot(.................
drawnow;

drawnow will force the plot to update immediately. Otherwise it probably won't get around to it until the loop is entirely finished so that all you will see is the very last set of data plotted.

[Sepehr Ariaei]

Does drawnow works on semilogy too?

[Walter Roberson]

Yes, drawnow() works on all graphics updates.

Answer 2

[Thorsten]

 subplot(1,2,1);
 plot(x, y);
 drawnow