How to generate graph at the same time that data is obtained?

How to generate graph at the same time that data is obtained?

Answer 1

[Matthew]

One thing you can do is add new data to an already existing plot.

figure;
plot(1:10,1:10);
ah = gca;

for loopIX = 11:100
    %New Data becomes available
    newXValue = loopIX;
    newYValue = rand;

      %Add the new data to the plot
      ah.Children.XData(end+1) = newXValue;
      ah.Children.YData(end+1) = newYValue;
  end

Note that you may get warnings about the data arrays being sized wrong between the Xdata update and the Ydata update.

[Walter Roberson]

To avoid that warning, use

set(ah.Children, 'XData', [ah.Children.XData, newXValue], 'YData', [ah.Children.YData, newYValue])

Better yet, use animatedLine() to handle all of this.

[Matthew]

That requires going back to the old set notation! Not a bad thing, but it doesn't feel as clean.

I hadn't known about the animatedLine/addpoints functionality. For reference, here's an example from the documentation of how that could be used.

h = animatedline('Marker','o');
x = 1:5;
y = 1:5;
addpoints(h,x,y)
x = 6:10;
y = 6:10;
addpoints(h,x,y)

[alcides silva]

What I need is to see the graph being plotted at each iteration. And not the figure with all the points already computed. To facilitate visualization of wave propagation.

[Walter Roberson]

alcides silva:

At each time that you have a new point available, call addpoints() on the animatedLine() object, and then call drawnow().

Depending on your needs, you might want to set the 'MaximumNumPoints' option when you create the animatedLine

[alcides silva]

What I was hoping to do, I got with drawnow update or drawnow expose. Great. Thank you so much.