MATLAB: Decreasing the lag on the Android Matlab app sensor data .

sensor data

Hi,I am a total newbie to matlab. I been trying to get sensor data from my android phone. I am getting the data but there is almost a lag of 1 second. here is my code
clear all
close all
clc
connector on;
m = mobiledev();
m.OrientationSensor = 1;
m.Logging = 1;
pause (4)
for c = 1:inf
       o = m.Orientation
       pause(0.1);
       figure(1);
       axis tight
       hold on  
       plot(c,o(1),'.');
       figure(2);
       axis tight
       hold on  
       plot(c,o(2),'.');
       figure(3);
       axis tight
       hold on  
       plot(c,o(3),'.');
end

Best Answer

Your graphics is inefficient and is going to get worse as you increase the number of readings.
for K = 1 : 3
  figs(K) = figure(K);
  figax(K) = axes('Parent', figs(K));
  axis(figax(K),'tight');
  pline(K) = plot(figax(K), [], [], '.');   %exists but empty
end
drawnow();
crecord = zeros(4, 512); %pre-allocate for 512 points 
for c = 1:inf
  o = m.Orientation;
  if c > size(crecord,2)
    crecord(4,c+255) = 0;  %grow the record if it is getting small
  end
  crecord(4,c) = c;        %remember observation number
  for K = 1 : 3            
    crecord(K, c) = o(K);  %copy the current data into the record
    set(pline(K),'xdata', crecord(4,1:c), 'ydata', crecord(K,1:c)); %update line
  end
  drawnow();   %repaint screen
end
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