What is Wrong?

[alexmihh]

Why does the 2nd line below work in my efs but the first does not? ( I rem it out)

// EMAValue = ema(2,o(sym(CHARTiSymbol + "," + iIntervalEMA)));
EMAValue = ema(2,ohlc4(sym(CHARTiSymbol + "," + iIntervalEMA)));

[ACM]

alexmihh
It is not working because o() is not a valid source
Alex

[alexmihh]

Strange-- Well, how can I make this to be based on "open"?

Every chart has "open" as a source, so why would it not work in efs? This is not logical. Even if the "open" source is designated a different way, this too is not obvious since all I did was remove the "hlc4" portion.

[ACM]

alexmihh
See this article in the EFS KnowledgeBase for the syntax
Alex

[alexmihh]

Is that article clear? I mean, if I wanted to find out the syntax for source ohlc/4 of

EMAValue = ema(2,ohlc4(sym(CHARTiSymbol + "," + iIntervalEMA)));

how could I get that from the article you suggested?

All I am saying is a very simple thing. if "ema(2,ohlc4(..." works in efs, one would expect "ema(2,o(..." to work for "open."

Even after reading the article I still don't know how to get "open" as a source in the efs expression that works so nicely for ohlc/4. Can you give it to me?

Just so you know, this is an efs that is attached to a chart to grab values from a different chart and even a different time interval. So the data coming into the chart is not the data I am using in the efs

[ACM]

alexmihh
As I indicated in a previous reply o() is not a valid function. If you want to base your expression on the Open then replace ohlc4(...) with open(...)
Alex

[alexmihh]

OK, I get it now. (got a question below)

This is confusing though because in other places of efs you suppose to use "O" etc.

Here is some code I used in other efs and has been engrained in me

// 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"
// EMAstudy = new MAStudy(16, 0, nPriceSource, eval(nType));
//
// vMainEMA = EMAstudy.getValue(MAStudy.MA);

Now I am trying something new. Instead of grabbing the EMA value, I want to grab the open of the previous bar (of a symbol and time interval NOT of the current chart)

I am trying this but getting nowhere

vOPENPREVBAR = open(2,(sym(CHARTiSymbol + "," + iIntervalEMA)));

I know this is not the previous bar open either, but just this is getting me NULL

How would I get this for the previous open/close?

[alexmihh]

I figured it out

vOPENPREVBAR = open(2,(sym(CHARTiSymbol + "," + iIntervalEMA)));

did not make sense -- looking 2 bars into to future

vOPENPREVBAR = open(-1,(sym(CHARTiSymbol + "," + iIntervalEMA)));

is correct

[ACM]

alexmihh

This is confusing though because in other places of efs you suppose to use "O" etc.

Here is some code I used in other efs and has been engrained in me

// 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"
// EMAstudy = new MAStudy(16, 0, nPriceSource, eval(nType));
//
// vMainEMA = EMAstudy.getValue(MAStudy.MA);

The price sources you are referring to ie "O", "C", etc are not series functions [such as open(), high(), close(), ohlc4(), etc] which are required by the efs2 functions like ema() but strings for use with the older (but still available) efs1 functions.
One way to differentiate an efs1 built-in study function from its efs2 equivalent is to look for the new keyword eg
// EMAstudy = new MAStudy(16, 0, nPriceSource, eval(nType));
Hope this helps
Alex