Can ema() study return null?

[buzzhorton]

In this example, would v34EMA ever be null after this line:

v34EMA = ema(34,0);

was executed?

Originally posted by Alexis C. Montenegro
John
In addition to what Steve said if you want to use .toFixed() you need to run a null check on the value first.
The enclosed revision of your script should now work
Alex

var v34EMA = null;

function preMain() {

    setPriceStudy(true);

} 

function main() {

    v34EMA = ema(34,0);
    if(v34EMA==null) return;
    //return("34="+v34EMA);
    return("34="+v34EMA.toFixed(3));
} 

[eSignal_JasonK]

Hello Avery,

Yes it would. It will return null for the first 33 bars in the chart because the study requires 34 bars before it will return a valid number. To test for this, you can use the debugPrintln() function and view the results in the formula output window after running the test script on a chart.

function main() {
    var v34EMA = ema(34, 0);
    if (v34EMA == null) debugPrintln("Bar " + getCurrentBarIndex() + " 34EMA is " + v34EMA);
    
    return v34EMA;
} 

[buzzhorton]

Thanks again, Jason.

I am finally moving along the learning curve!

[eSignal_JasonK]

You're most welcome.