title: Parallel execution in MATLAB
body: <p>I am new in MATLAB and I just try to execute a parallel small program, but the problem is that the parallel execution take more time than serial ? </p>
  
  <hr>
  
  <pre><code>close all
  clear all
  clc
  
  a= rand(1e6,1);
  b= rand(1e6,1);
  c= zeros(size(a));
  d= ones(size(c));
  e= zeros(size(d));
  
  tic
  tstart=tic;
  for i=1:length(a)
      c(i)=a(i)+b(i);
      d(i)=c(i)+b(i)*a(i)+b(i)/a(i)+b(i)*a(i)+b(i);
      e(i)=d(i)+c(i)*a(i)+b(i)/a(i)+b(i)*a(i)+b(i);
      c(i)=a(i)+b(i);
      d(i)=c(i)+b(i)*a(i)+b(i)/a(i)+b(i)*a(i)+b(i);
      e(i)=d(i)+c(i)*a(i)+b(i)/a(i)+b(i)*a(i)+b(i);
      c(i)=a(i)+b(i);
      d(i)=c(i)+b(i)*a(i)+b(i)/a(i)+b(i)*a(i)+b(i);
      e(i)=d(i)+c(i)*a(i)+b(i)/a(i)+b(i)*a(i)+b(i);
  end
  t_normal_for=toc(tstart)
  
  tstart=tic;
  parfor i=1:length(a)
      c(i)=a(i)+b(i);
      d(i)=c(i)+b(i)*a(i)+b(i)/a(i)+b(i)*a(i)+b(i);
      e(i)=d(i)+c(i)*a(i)+b(i)/a(i)+b(i)*a(i)+b(i);
      c(i)=a(i)+b(i);
      d(i)=c(i)+b(i)*a(i)+b(i)/a(i)+b(i)*a(i)+b(i);
      e(i)=d(i)+c(i)*a(i)+b(i)/a(i)+b(i)*a(i)+b(i);
      c(i)=a(i)+b(i);
      d(i)=c(i)+b(i)*a(i)+b(i)/a(i)+b(i)*a(i)+b(i);
      e(i)=d(i)+c(i)*a(i)+b(i)/a(i)+b(i)*a(i)+b(i);
  end
  t_parfor=toc(tstart)
  
  ***************************************
  t_normal_for =
  
      0.3860
  
  
  t_parfor =
  
      2.8403
  </code></pre>
  
  <hr>
  
  <p>Can anyone help! In fact I have 4 workers in my computer and the version of MATLAB is R2014a. 
  Another question please, can I send the same function to each worker in my computer?</p>
  
  <p>Thank you in advance
  Ammar</p>