function ftATR(ATRPeriod)
{
 vars tr = series(0, -ATRPeriod); // create a static series
 if(TrueRange() != 0)
 {
 shift(tr, TrueRange(), ATRPeriod);
 }
 if(tr[ATRPeriod-1] == 0)
 { 
  ATRPeriod = 1;
  while(tr[ATRPeriod] != 0) ATRPeriod++;
 }
	
 var myATR = Sum(tr, ATRPeriod) / ATRPeriod;

 return(myATR);
}

ftATR(int TimePeriod): var

var my_atr = ftATR(30);

var ftATR(int ATRPeriod)

function ftATR(ATRPeriod)

var ftATR2(int ATRPeriod)
{
	var* tr = zalloc(ATRPeriod*sizeof(var));
	int i = 0;
	int ElementIDX = 0;
	var MyTrueRange;
	
	while(ElementIDX < ATRPeriod)
	{
		MyTrueRange = max(priceHigh(0+i),priceClose(1+i))-min(priceLow(0+i),priceClose(1+i));
		if (MyTrueRange != 0)
		{
			tr[ElementIDX] = MyTrueRange;
			ElementIDX++;
		}
		i++;
		if(i > 10*ATRPeriod) break;
	}
	
	var myATR = Sum(tr, ElementIDX) / ElementIDX;
	if(!Init && !is(LOOKBACK) && myATR == 0) printf("\nftATR is zero! This shouldn't happen!");
	return(myATR);
}