Hi everyone,

I am using matlab to use an AI and an AO at the same time in a loop. I basically get the signal by PCI 6229 and send back the signal to the system by PXI-6133. The code below is the code I would like to use it for this reason. The code is working fine but it is so slow. I would like to use it in a close to the real time but its far away from being real time.

May I ask you to please guide me to how to speed up my code?
Best regards,
Mohammad




x=1:1000;
y=sin(x);

AI = analoginput('nidaq','Dev1');
chan = addchannel(AI,0);
duration = 0.0005; %0.5ms second acquisition
set(AI,'SampleRate',1000)
ActualRate = get(AI,'SampleRate');
blocksize = get(AI,'SamplesPerTrigger');
Fs = ActualRate;

AO = analogoutput('nidaq','Dev4');
chan_o = addchannel(AO,0);
set(AO,'SampleRate',1000);

rampR=zeros(500,1);  %% ramp rise
rampF=zeros(500,1);  %% ramp fall

set([AI AO],'TriggerType','Manual')
AI.ManualTriggerHwOn = 'Trigger';

for j=1:50,
    a(j)=0.04*j;
end

while (1)
    
    previous_pos=0;
    for i=0:49
        slope=round(49*rand)+1;
        rampR (10*i+1:10*i+10) = previous_pos+a(slope)*[1:10];
        previous_pos=rampR (10*i+10);
    end
    rampR=rampR/max(rampR);

    ramp=[rampR;rampR];
    putdata(AO,ramp)

    start([AI AO])
    trigger([AI AO])
    
    data = getdata(AI);
    [f,mag] = daqdocfft(data,Fs,blocksize);
    mag1=max((10.^(mag/10))/1000000)
end

delete(AI)
clear AI
delete(AO)
clear AO

See the answer posted on this identical thread
http://www.mathworks.com/matlabcentral/newsreader/view_thread/290064