is this an iteration or function?

[mechanik]

The thinkorswim docs don't give much about the sum function.. but in this code is the variable 'QQQtmp1' being iterated by the SUM function over the length of bars like a function?

def QQQprice = close(symbol="QQQ");
def QQQVolume = volume(symbol="QQQ");
def length = 21

def QQQtmp1 = if QQQprice > QQQprice[1] then QQQprice - QQQprice[1] else 0;
def QQQtmp2 = if QQQprice[1] > QQQprice then QQQprice[1] - QQQprice else 0;

def QQQd2 = Sum(QQQtmp1, length);
def QQQd4 = Sum(QQQtmp2, length);

 

[Joshua]

Yes, its an iteration over a length of bars.

 

[mechanik]

Ok so thinkscript must have a lot of functions like this