my $filter = sub {
  return 0 if ($UseDriverCell and $_[0]->[p_driver] !~ /$DriverPattern/ );
  return 0 if ($UseNetPattern and $_[0]->[p_name]   !~ /$NetPattern/ );
  
  # If we are here, then either we matched all requirements, or there weren't any
  return 1;
};

foreach my $i (1..$UpperFanoutLimitOfTable) {
  
  my $Count = 0;
  
  foreach my $net (grep {$filter->($_)} @{$NetStats[$i]}) {
    if ($DebugMode) { .. do debugging output ..  }         
      
    $TotalCap[$i]    += $net->[p_cap];
    $TotalRes[$i]    += $net->[p_res];
    $TotalLength[$i] += $net->[p_length];
    $FanoutCount++;
  }
  
  if ($Count > 0) {
  
    $CapAvg[$i] = $TotalCap[$i] / $Count;
    $ResAvg[$i] = $TotalRes[$i] / $Count;
    $LengthAvg[$i] = $TotalLength[$i] / $Count;

    if ($DebugMode) {
      printf ("CapAvg[$i] = %0.6f\n",$CapAvg[$i]);
      printf ("ResAvg[$i] = %0.6f\n",$ResAvg[$i]);
      printf ("LengthAvg[$i] = %0.6f\n",$LengthAvg[$i]);
    }

  }
  else {
    print ("No nets match input criteria when fanout = $i.  Please review command-line settings--they may be too restrictive!");
  }
}