efsInternal - Passing functions as parameters

[mbuta]

Hi,

Can someone point me to some examples of using [more than once, very important] efsInternal to the same function, who's parameters are other internal functions?

Example:

var st1 = rsi(3, efsInternal("rOsc",rMA5,rMA10));
var st2 = rsi(3, efsInternal("rOsc",rMA10,rMA20));
var st3 = rsi(3, efsInternal("rOsc",rMA20,rMA50));

where:
function rOsc(,rFast,rSlow) {return rFast(0)-rSlow(0);}

and:
function rMA5() {return stMA5.getValue(0)*5;}
function rMA10() {return stMA10.getValue(0)*10;}
function rMA20() {return stMA20.getValue(0)*20;}
function rMA50() {return stMA50.getValue(0)*50;}

and of course stMA5,stMA10,stMA20,stMA50 are properly declared.

The above example works fine if I use hard coded rsi function [internally], but it is slow. With efsInternal I get the same plot [the last declared]. If I use diferent length for rsi, i get three diferent plots.

Note: We went through something similar before, but it was blamed on EFS1 at the time.
Here, I suspect it has to do with the way EFS engine runs series, one at a time, at ALLBARS, which may require that ALL PARAMETERS of efsInternal to be already declared data series, case when I can't use it.

If someone who understands the internals of the efs engine can clarify this issue, it would be greatly appreciated.

Thank you.

[mbuta]

It has been almost a week since I posted this question.

Nobody from eSignal support feels obligated to provide an answer? I am, afterall, a am paying customer.

Thank you.

[ScottJ]

Hi Mihai,

Although EFS is supported by the community of users, we do try to assist where we can. Unfortunately, our EFS experts have been tied-up recently. We'll have more availability next week to assist. Sorry for the delay.

Hopefully, another user may have some insight.

Thanks.

[mbuta]

Hi Scott,

Thank you very much.
I can wait, no problem, as long as I know I am not forgotten.

[eSignal_JasonK]

Hello Mihai,

The key is to make sure the parameters you are passing inside the efsInternal() calls are also in the form of series objects, which can be accomplished using efsInternal() nested inside the efsInternal() call for the rOsc function. Try the following and let us know if this accomplishes what you wanted.

function preMain() {
    //setPriceStudy(true);
    setStudyTitle("test");
    //setShowCursorLabel(false);
    setCursorLabelName("st1", 0);
    setCursorLabelName("st2", 1);
    setCursorLabelName("st3", 2);
}

var bInit = false;

var stMA5 = null;
var stMA10 = null;
var stMA20 = null;
var stMA50 = null;

var st1 = null;
var st2 = null;
var st3 = null;

function main() {
    if (bInit == false) {
        stMA5  = sma(5);
        stMA10 = sma(10);
        stMA20 = sma(20);
        stMA50 = sma(50);
        st1 = rsi(3, efsInternal("rOsc",efsInternal("rMA", stMA5, 5),efsInternal("rMA", stMA10, 10)));
        st2 = rsi(3, efsInternal("rOsc",efsInternal("rMA", stMA10, 10),efsInternal("rMA", stMA20, 20)));
        st3 = rsi(3, efsInternal("rOsc",efsInternal("rMA", stMA20, 20),efsInternal("rMA", stMA50, 50)));
        bInit = true;
    }
 
    return new Array(st1.getValue(0), st2.getValue(0), st3.getValue(0));
}


function rOsc(rFast, rSlow) {
    return rFast.getValue(0)-rSlow.getValue(0);
}

function rMA(x, num) {
    if (x == null) return;
    return x.getValue(0)*num;
} 

[mbuta]

Hi Jason,

Thank you and, again, sorry for the late reply.

I understand now and it makes absolute sense what you say: because the EFS engine runs all data series at ALBARS time, all parameters have to be data series as well.

The only issue is with performance vs ease of coding.
I wanted to use efsInternal for the latter, but ran into performance slowdown, because it will execute every tick [in real time].

I suggested this before as solution: Allow INDIVIDUAL "ExecuteOnCloseOnly" for each data series, as opposed to the entire efs. This way, we could choose which functions to be executed every tick and which not.

As I believe others run often in similar problem, I suggest to add some notes/clarifications about it in efsInternal Help file.

Thank you again for your help.