Previous 2EMA

[alexmihh]

I can get a 2EMA (vMinorEMA) to plot and work with withj no problem, but when I try to grab the PREVIOUS value of 2EMA (vMinorEMAPREV1), I get null

Why?


nPriceSource = "O"; // nPriceSource == "C" || nPriceSource == "O" || nPriceSource == "H" || nPriceSource == "L")
nType = "MAStudy.EXPONENTIAL"; // nType == "MAStudy.EXPONENTIAL" || nType == "MAStudy.SIMPLE" || nType == "MAStudy.WEIGHTED" || nType == "MAStudy.VOLUMEWEIGHTED"
MINOREMAstudy = new MAStudy(2, 0, nPriceSource, eval(nType));

vMinorEMA = MINOREMAstudy.getValue(MAStudy.MA);
vMinorEMAPREV1 = MINOREMAstudy.getValue(-1);

[ACM]

alexmihh
That is happening because you are using an efs2 method to retrieve the value of an efs1 function.
The correct syntax is vMinorEMAPREV1 = MINOREMAstudy.getValue(MAStudy.MA,-1);
Alex

[alexmihh]

Originally posted by Alexis C. Montenegro
alexmihh
That is happening because you are using an efs2 method to retrieve the value of an efs1 function.
The correct syntax is vMinorEMAPREV1 = MINOREMAstudy.getValue(MAStudy.MA,-1);
Alex

OK Thanks. I was able to come up with an alternative method of storing the value of EMA2 as a seperate value before the next value of EMA2 was caluculated.

How does one know when one is dealing with efs1 or efs2? How could I have figured this out on my own?

[ACM]

alexmihh
You can find the complete list of the efs2 functions for the built-in studies in this article of the EFS KnowledgeBase.
Also whenever you see the "new" keyword as in var myStudy = new MAStudy(....) you are dealing with an efs1 function.
Alex