Nested for loops using vectorization in MATLAB

Ahmad Lakhani

2017 9 22

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I currently have two national instrument devices hooked up to MATLAB and have this nested for loop:

for i=1: 5
      removeChannel(session, 7)
      addAnalogInputChannel(session, 'cDAQ1Mod8', ['ai' num2str(i)], 'Voltage');
      for j=1: 5
          signal = [in(i,:) out(j,:)];
          outputSingleScan(session, signal);
          measurements(6-j,6-i) = session.inputSingleScan;
      end
  end

Basically what this does is removes the last channel in the session and adds a new one from the DAQ depending on the iteration. A signal is then sent from the NI USB device and then another measurement is read from the DAQ. How do I use vectorization for this nested for loop?

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Ahmad Lakhani 2017-9-22

编辑：Ahmad Lakhani 2017-9-22

@DonaldLee outputSingleScan is a Matlab function. the first argument is the session and the second argument it takes is a row vector. The function takes the voltage measurement from the DAQ.

Yeah I need it vectorized because it is too slow. My goal here is to see whether or not it makes a difference for my code. Thanks for the help with the if statements.

OCDER 2017-9-22

Oh, I see. I don't have the Data Acquisition Toolbox, so hopefully one of the pros will stop by to lend a help. Also, feel free to edit the question with the simpler code to make it easy on their eyes :)

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