bool cmp (double d2d)
 {
   bool flag;
   double probLos;
   Ptr<UniformRandomVariable> m_uniformVar;
  m_uniformVar = CreateObject<UniformRandomVariable> ();
  m_uniformVar->SetAttribute ("Min", DoubleValue (0));
  m_uniformVar->SetAttribute ("Max", DoubleValue (1));
    double PRef = m_uniformVar->GetValue ();

      if (d2d <= 5)
            {
              //NS_LOG_INFO("2D Distance: " << distance2D);
              probLos = 1;
              NS_LOG_INFO("probLos <=5 : " << probLos);
            }
          else if (d2d <= 49)
            {
              //NS_LOG_INFO("2D Distance: " << distance2D);

              probLos = exp (-(d2d - 5) / 70.8);
              NS_LOG_INFO("probLos<=49: " << probLos);
            }
          else
            {
              probLos = exp (-(d2d - 49) / 211.7) * 0.54;
              NS_LOG_INFO("probLos<=50: " << probLos);
            }

//comapre the Random variable with probability loss.
if (PRef<probLos)
{
  flag= true;
}

return flag;

 }