How to create matrix?

what is the code that can i create matrix n*m, where m is the pulse number and n is pulse length for a real data. Here is an example 3 pulses.The data I want is when the ‘lowSignal’ vector is equal to 1. I attached the data file and the matlab code.

 load TX_DATA.mat 
  signal = TX(1:1400000);
  subplot(3,1,1);
  plot(signal);
  grid on;
  % MAIN CODE IS THE FOLLOWING TWO LINES OF CODE.
  % Threshold the signal
  lowSignal = abs(signal) < 0.04;
  % Remove stretches less than 10,000 elements long.
  % And invert it to get the high signal areas instead of the quiet areas.
  lowSignal = ~bwareaopen(lowSignal, 10000);
  % Now we're done.  Plot the results.
  subplot(3,1,2);
  plot(lowSignal, 'b-', 'LineWidth', 2);
  grid on;
  % Plot both on the same graph now.
  subplot(3,1,3);
  plot(signal, '-', 'Color', [0,.5,0]);
  hold on;
  plot(lowSignal, 'b-', 'LineWidth', 2);
  grid on;

[Abhishek Pandey]

Hi Mansour,

Your question is not very clear. Could you please elaborate some more so that we know what you intend to do here. I believe an example with a smaller set of data would be very helpful.

- Abhishek