How can I change the values of a plot inside a loop?

Hi all,

I want to plot something and then change the values of some variables inside a loop without plotting everything again. I think something as 'handle' and 'set' would help but, honestly, I do no have any idea of how to use it. I am going to use real-time data, so I want to use quick functions, this is the reason because I don't want to plot again and just change the values inside a plot already defined. Something like that:

h=plot(x,y)
n=0;
while n<5
  x=x+n;
  y=y-n;
    %%change the values of x and y in the previous plot%%
  n=n+1;
end

Answer 1

[Kelly Kearney]

You can set the 'xdata' and 'ydata' properties of the line. You may have to make sure you set your axis limits so they aren't reset as the data moves.

x = sort(rand(10,1));
y = rand(10,1);
h = plot(x,y);
set(gca, 'xlim', [0 20], 'ylim', [-10 1]);
n=0;
while n<5
  x=x+n;
  y=y-n;
  n=n+1;
  set(h, 'xdata', x, 'ydata', y);
  pause(1);
end

Answer 2

[Lobo]

That is exactly was I was looking for. Thank you very much!