Real Time Plot Not Smooth Enough

Hi Guys

I have written a real time plotter that plots 128 samples I receive from an EEG headset, one sample at the time and attached is the result.

Obviously, since I'm plotting one point at a time, it is not going to be continuous enough.

Is there anyway to do real time interpolation to some how connect these dots?

If not, how do people produce real time plots that are continuous (smooth or jagged doesn't matter)?

[Rick Rosson]

Please post your code.

[Bolin]

Let's 'h' be the object we wish to query

for Seconds = 1:5
    for Samples = 1:128

      Channel_1 = h.data(Samples,4);
      Channel_2 = h.data(Samples,5);
      subplot(2,1,1)
      plot(i+Seconds*128,Channel_1,'--r','LineWidth',1.8), axis([0 640 2000 8000])
      hold on
      grid on
      subplot(2,1,2)
      plot(i+Seconds*128,Channel_2,'--g','LineWidth',1.8), axis([0 640 2000 8000])
      hold on
      grid on    
      drawnow

      end 
  end

Answer 1

[Star Strider]

To produce a line that appears continuous, change your plots to:

plot(i+Seconds*128,Channel_1,'-r','LineWidth',1.8)

plot(i+Seconds*128,Channel_2,'-g','LineWidth',1.8)

The '--' linetype will plot a dashed line, the '-' linetype will plot a continuous one.