Series Object Returning Null Value

[pro_trader]

Below is a snippet of the code I am using. The MTV series object is returning values as expected. However the LR and LBDivine values are both returning null values. Any ideas as to why? They are using functions that are built in to eSignal.

function main(LookBack) 
{      
    if (MTV==null)
        MTV=efsInternal("MTValue",LookBack);
    if (LR==null)
        LR=middleLinearReg(10,1,MTV);
    if (LBDivine==null)
        LBDivine=lowerBB(18,1.8,LR);
    
    debugPrintln("MTV = " + MTV.getValue(0));
    debugPrintln("LR = " + LR.getValue(0));
    debugPrintln("LBDivine = " + LBDivine.getValue(0));
    
    Divine=LR.getValue(0)-LBDivine.getValue(0);
    return Divine;
}

[waynecd]

debugClear();

var MTV=null;//declare study series variables as global
var LR=null;
var LBDivine=null;

function main(LookBack) 
{     
    if(MTV===null) 
        MTV = efsInternal("MTValue",LookBack);
    if(LR===null) 
        LR = middleLinearReg(10,1,MTV);
    if(LBDivine===null) 
        LBDivine = lowerBB(9,1.8,LR);//lowerBB() "nLength" parameter must be less than the middleLinearReg() nLength parameter, I don't know why
    //if(LBDivine===null) LBDivine = lowerBB(10,1.8,LR);//returns null
    //if(LBDivine===null) LBDivine = lowerBB(18,1.8,LR);//returns null

    if(MTV.getValue(0)==null) return;
    if(LR.getValue(0) == null) return;
    if(LBDivine.getValue(0)==null) return;
    debugPrintln("MTV = " + MTV.getValue(0));
    debugPrintln("LR = " + LR.getValue(0));
    debugPrintln("LBDivine = " + LBDivine.getValue(0));
    
    Divine=LR.getValue(0)-LBDivine.getValue(0);
    return Divine;
}
function MTValue(x){//test function since non was supplied
    return offsetSeries(ema(9),x);
} 

[ACM]

pro_trader
The reason L8Divine is returning null is simply because the Linear Regression study only returns values over the defined length and the Bollinger Band (the basis of which is nothing other than a simple moving average) requires a number of data points equal to its length +1 before it can return any values.
You can very easily verify this using just the built-in studies. In a chart apply a built-in Linear Regression for example of length 10 and then apply to that a 20 period Bollinger Band study. You will see that the Bollinger Band will not return any values until its length is less than that of the Linear Regression by at least 1 (FWIW this is no different than a moving average requiring a number of bars equal to its length +1 before it can be fully primed and return a value)
As to LR returning null that may be due to any number of reasons which are not apparent from your code since it is incomplete.
As suggested in the guidelines of this forum you should provide the complete code necessary to replicate an issue so that others do not have to guess while trying to assist you
Alex

Below is a snippet of the code I am using. The MTV series object is returning values as expected. However the LR and LBDivine values are both returning null values. Any ideas as to why? They are using functions that are built in to eSignal.

function main(LookBack) 
{      
    if (MTV==null)
        MTV=efsInternal("MTValue",LookBack);
    if (LR==null)
        LR=middleLinearReg(10,1,MTV);
    if (LBDivine==null)
        LBDivine=lowerBB(18,1.8,LR);
    
    debugPrintln("MTV = " + MTV.getValue(0));
    debugPrintln("LR = " + LR.getValue(0));
    debugPrintln("LBDivine = " + LBDivine.getValue(0));
    
    Divine=LR.getValue(0)-LBDivine.getValue(0);
    return Divine;
}