efsExternal for multiple intervals

[ratherBgolfing]

In a 70T interval chart I want to check a condition in a 400T interval chart and return a flag of "long" or "short" using efsExternal.

I read Alex's various threads on efsInternal and efsExternal, including the 01-09-2006 thread to Z11, and I obviously still don't get it.

Also, do I need to pass the symbol also (in this case AB H6) or will the external efs default to the symbol being used in my main efs?

Thanks in advance.


// my external efs


var vTrend = "flat";

function preMain() {
setColorPriceBars(true);
setPriceStudy(true);
setStudyTitle("VerifyTrend");


var vFast1 = new FunctionParameter("vFast1", FunctionParameter.NUMBER);
vFast1.setLowerLimit(1.00);
vFast1.setDefault(5.00);
var vFast2 = new FunctionParameter("vFast2", FunctionParameter.NUMBER);
vFast2.setLowerLimit(1.00);
vFast2.setDefault(10.00);

} // end preMain


function main(vFast1, vFast2) {

var vMA1e = new MAStudy(vFast1, 0, "Close", MAStudy.EXPONENTIAL);
var vMA1s = new MAStudy(vFast2, 0, "Close", MAStudy.SIMPLE);

if ( vMA1e.getValue(MAStudy.MA) < vMA1s.getValue(MAStudy.MA) ) { // short condition
setPriceBarColor( Color.red);
vTrend = "short";
}
else {
setPriceBarColor( Color.lime);
vTrend = "long";
}

return (vTrend);

} // end Main



*********

// In my main efs I am calling the external efs as follows:

vTrend = efsExternal("VerifyTrend.efs",5,10,inv("400T") );

drawText(vTrend,BelowBar4);


When I print it I get an "(object Series)" error.

[ACM]

ratherBgolfing
To my knowledge the efsInternal() and efsExternal() functions can only retrieve values and not strings which is what is instead returned by your VerifyTrend.efs script.
In that script change "long" and "short" to 1 and -1 respectively.
Alex

[ratherBgolfing]

Thanks Alex

i made the change and get the same result.

Am I passing the 400T properly.

Also, do I need to pass the symbol also (per my earlier post)?

[ACM]

ratherBgolfing
In your drawText() command you need to use the value and not the series object. Try replacing vTrend with vTrend.getValue(0).
As to your second question you would pass the symbol only if you want the external efs (or function) to run in the context of a symbol that is different from the chart symbol
Alex

[ratherBgolfing]

Alex,

vTrend.getValue(0) gives me the error:

Parameter Number 1 of Function drawText is invalid.

Thanks re symbol; that makes sense.

[ACM]

ratherBgolfing
Run a null check on the value prior to using it in the drawText() command
Alex

[ratherBgolfing]

Alex

Now using:

if (vTrend == null) vTrend = 4;
drawText(vTrend, BelowBar4);

Still printing out "(object Series)"

[ratherBgolfing]

Alex

Tried passing 5 mins instead of 400T to see if that made a diff...it did not.

vTrend = efsExternal("VerifyTrend.efs", 5, 10, inv(5));

[ACM]

ratherBgolfing
I just tested it at my end and it works fine (see image below)
Alex

[ratherBgolfing]

Did you change my external efs code?

I get a return of null now...

var vTrend = efsExternal("VerifyTrend.efs",5,10,inv("400t"));
if (vTrend.getValue(0) == null) drawText ("null",BelowBar4);
else drawText(vTrend.getValue(0),BelowBar4);

this prints "null" below every bar

please post the code you are using for the external efs...thanks.

[ratherBgolfing]

Alex

Got it....forgot to take the " "s off when I changed from "short" and "long"

Thanks