Scrollable Plot in real time from Arduino to Matlab

Hi,

I meet a problem when plotting data from Arduino to Matlab, where the x axis is increasing continously and cause the compression of plot. I want to let the x axis auto-scroll, something like axis(t,t+dx,y1,y2). I've tried two ways plotting the data, shown below. Is there any other methods to make the x axis auto-scrolling? Thank you in advance!

Method 1

%Method 1
clear all
a = arduino('COM5','ProMini328_5v');
%interv = 10;
passo = 1;
t=1;
x=0;
%while(t<interv)
while(t)
b=a.readVoltage('A3');
x=[x,b];
plot(x);
%axis([0,interv,0,5]);
ylim('auto');
grid
t=t+passo;
drawnow;
end

Method 2

clear all
clc

%User Defined Properties 
a = arduino('COM5','ProMini328_5v');           % define the Arduino Communication port
plotTitle = 'Arduino Data Log';  % plot title
xLabel = 'Elapsed Time (s)';     % x-axis label
yLabel = 'Voltage';      % y-axis label
legend1 = 'Optical Channel 1';
legend2 = 'Optical Channel 2';

yMax  = 40                           %y Maximum Value
yMin  = 0                       %y minimum Value
plotGrid = 'on';                 % 'off' to turn off grid
min = 0;                         % set y-min
max = 40;                        % set y-max
delay = .01;                     % make sure sample faster than resolution 
%Define Function Variables
time = 0;
data = 0;
data1 = 0;
data2 = 0;
count = 0;
%Set up Plot
%plotGraph = plot(time,data,'-r' )  % every AnalogRead needs to be on its own Plotgraph

plotGraph1 = plot(time,data1,'-b')
hold on                            %hold on makes sure all of the channels are plotted
plotGraph2 = plot(time, data2,'-g' )
title(plotTitle,'FontSize',15);
xlabel(xLabel,'FontSize',15);
ylabel(yLabel,'FontSize',15);
legend(legend1,legend2);
axis([yMin yMax min max]);
grid(plotGrid);
tic

while ishandle(plotGraph1) %Loop when Plot is Active will run until plot is closed
         %dat = a.analogRead(0)* 0.48875855327; %Data from the arduino
         %dat1 = a.analogRead(2)* 0.48875855327; 
         %dat2 = a.analogRead(3)* 0.48875855327; 
         dat1 = readVoltage(a,'A2'); 
         dat2 = readVoltage(a,'A3'); 
         count = count + 1;    
         time(count) = toc;    
         %data(count) = dat(1);         
         data1(count) = dat1(1)
         data2(count) = dat2(1)
         %This is the magic code 
         %Using plot will slow down the sampling time.. At times to over 20
         %seconds per sample!
         %set(plotGraph,'XData',time,'YData',data);
         set(plotGraph1,'XData',time,'YData',data1);
         set(plotGraph2,'XData',time,'YData',data2);
         %x = linspace(0,100,10000);
         xlim([0 30]);
         %xticks('auto');
         ylim('auto');
         %axis([time(count) time(count)+10 min max]);
         
          %axis([0 time(count) 1 5]);
          %xlim([max(0,time(count)-0.1) max(10,time(count)-0.1)]);
          %ylim(min,max);
   
          %Update the graph
          pause(delay);
  end
delete(a);