maintaining previous bar's data when called from external efs

[dcook]

I have the following code to grab a couple of variables from an external efs. But I can't figure out how to keep the variables from the previous bar.

var DBCall;
var DBUpper;
var DBLower;
DBCall = efsExternal("DecisionBar/DecisionBarStrategy.efs", LowMA, HighMA, NumPrevPivots, 2, true, true);
DBUpper = getSeries(DBCall, 0);
DBLower = getSeries(DBCall, 1);

I need DBUpper and DBLower from the current bar and the previous bar.

[ACM]

dcook
To retrieve the values from the DBUpper and DBLower series you use the getValue() method as shown in the enclosed basic example
Alex

var DBCall;
var DBUpper;
var DBLower;
DBCall = efsExternal("DecisionBar/DecisionBarStrategy.efs", LowMA, HighMA, NumPrevPivots, 2, true, true);
DBUpper = getSeries(DBCall, 0);
DBLower = getSeries(DBCall, 1);

//to retrieve the values use xxx.getValue(-n) where -n is the bar index (0 is current bar, 
//-1 prior bar, -2 two bars ago, etc)
var currDBUpper  = DBUpper.getValue(0);//current value of DBUpper
var prevDBUpper = DBUpper.getValue(-1);//previous' bar value of DBUpper
var currDBLower  = DBLower.getValue(0);//as above
var prevDBLower = DBLower.getValue(-1);//ass above
if(currDBUpper ==null || prevDBUpper==null || currDBLower ==null || prevDBLower==null) return;//null check on the values