Daily Range for a particular day in the week?

double TodaysDailyRange(int length=14){
   int dow = DayOfWeek();
   int count=0;
   double sum=0;
   for(int iD1 = 1; count < length; ++iD1){
      datetime when = iTime(_Symbol, PERIOD_D1, iD1);
      if( TimeDayOfWeek(when) != dow) continue;
      sum += iHigh(_Symbol, PERIOD_D1, iD1) - iLow(_Symbol, PERIOD_D1, iD1);
      ++count;
   }
   return sum / length;
}