Simulate 99 signals of with random phase of a real EEG signal

We need to simulate 99 random signals with the Monte Carlo method, and we have this code. Could you help us please to analyze each line of this code.

for i=1:M 
    delta=rand(1,fix((N-1)/2))*2*pi;
  d_real=rand(1,2);
  d_real=(d_real>0.5)*pi;
  if rem(N,2) % even or odd N?
    out=[d_real(1),delta,-fliplr(delta)];
  else
    out=[d_real(1),delta,d_real(2),-fliplr(delta)];
  end 
end

Delta is the signal in the time domain.

[Image Analyst]

Since no one has answered, why don't you just look up each of the functions in the help? rand(), fix(), fliplr(), and rem(). That will give you a start on understanding this code. Can't you ask the author of the code?