The problem is that on this platform,notifications more frequent than 20 times prt second may not be achievable.So please tell me how to modify code. Actually what I want to do is to input and output data one by one in real-time control.THANKS

if true
 % code
global time;  
global DoF; 
global dt;  dt = 0.001;
global AVCstates;
function [FitVal]=Controller1test3(kx, kdx)
d = daq.getDevices;
d(1)
s = daq.createSession('ni');
addAnalogInputChannel(s,'Dev1', 13, 'Voltage');
s.Rate =8000;
s.DurationInSeconds = 0.001;
s;
devices = daq.getDevices;
devices(1)
s2 = daq.createSession('ni');
addAnalogOutputChannel(s2,'Dev1',0,'Voltage');  
s2.IsContinuous=true;
s2.Rate =20000;
outputSingleValue = 1;
outputSingleScan(s2,outputSingleValue);             
T=0.01;         
n=round(T/dt); 
if ne(size(AVCstates,2),3) 
  ddx=0; dx=0; x=0;      
  ddx=AVCstates(3);     
  dx=AVCstates(2);  
  x=AVCstates(1);  
end
Accn=zeros(1,n); Vel=zeros(1,n); Disp=zeros(1,n);
time=0; 
for i=1:n 
  time=time+dt;
  cputime   
  xOld=x; 
  dxOld=dx;
  fAVC=-(kx*x+kdx*dx); 
  outputSignal =fAVC;
  s2.NotifyWhenScansQueuedBelow=1;
  lh2=addlistener(s2,'DataRequired',...
      @(src,event) src.queueOutputData(outputSignal'));
  queueOutputData(s2,outputSignal');
  startBackground(s2);
  data = inputSingleScan(s);
  ddx=data;   
  dx=dxOld+ddx*dt ;%velocity v=v'+at
  x=xOld+dx*dt ;% displacement s=s'+vt
  Accn(i)=ddx; 
  Vel(i)=dx; 
  Disp(i)=x;
end
figure(2)
plot(Accn);
xlabel('Time(Secs)');
ylabel('Voltage');
displayEndOfDemoMessage(mfilename)
figure(3)
plot(Vel);
xlabel('Time(Secs)');
ylabel('Velocity');
figure(4)
plot(Disp);
xlabel('Time(Secs)');
ylabel('Displacement');
figure(5); cla;
hL=plot(Disp); axis([0 n -0.002 0.002]);
set(gcf);
grid 'on';
FitVal=CalcFitness(Disp); 
AVCstates(3)=ddx;   
AVCstates(2)=dx;  
AVCstates(1)=x; 
end
end

if true
  % code
function FitVal=CalcFitness(Vect)
Vect=Vect';
NoPoints=size(Vect,1);
FitVal=max(Vect(round(NoPoints*0.5):NoPoints),[],1);
end
end

if true
  % code
displacement=1;
velocity=2;
 fitness=Controller1test3(displacement,velocity)
end

[danhua yu]

pealse tell me how to do it.THANK YOU!!!