passing string through efsExternal

[whammer]

Hi,

I have the following studies and efsExternal, however, I am getting null for the string inside the myMA function.


var xLMA = efsExternal("myMA.efs", "close", MAlength, eSignalsym+" "+ContractMth+Exchange);
SMA0 = xSMA.getValue(0);


and inside myMA.efs, I get Null when I print the aSymbol string.

function main(nPrice, MALength, aSymbol) {
...
debugPrintln(aSymbol);
var temp=open(0,sym(aSymbol));

}

Not sure what I'm doing wrong.

W

[ACM]

Re: passing string through efsExternal

William
I just tried your example using both efsExternal() and efsInternal() [shown in the screenshot] and it is working fine.
You may want to post the complete script
Alex

Originally posted by whammer
Hi,

I have the following studies and efsExternal, however, I am getting null for the string inside the myMA function.


var xLMA = efsExternal("myMA.efs", "close", MAlength, eSignalsym+" "+ContractMth+Exchange);
SMA0 = xSMA.getValue(0);


and inside myMA.efs, I get Null when I print the aSymbol string.

function main(nPrice, MALength, aSymbol) {
...
debugPrintln(aSymbol);
var temp=open(0,sym(aSymbol));

}

Not sure what I'm doing wrong.

W

[whammer]

Alex, the efsExternal call was able to pass the string through parameter. But because I had applied the external function to the chart as well and the aSymbol value was not set in the chart, so it returned null because of that chart. Now it works. Thanks.

A question regarding plotting different colors in different return values.

Below is an indicator function which is supposed to plot 2 MA's on the same chart. But it only plots one of the MA and not the other. Could you point out to me how I can correct it please?
Thank you.

W

function main(PriceSource, fastMA, slowMA) 
{
    if (getBarState() == BARSTATE_NEWBAR )
    {
        xFMA = efsExternal("MA_withgap.efs", PriceSource, fastMA, getSymbol());
        FMA0 = xFMA.getValue(0);
        setDefaultBarFgColor(Color.cyan, 0);
        
        xSMA = efsExternal("MA_withgap.efs", PriceSource, slowMA, getSymbol());
        SMA0 = xSMA.getValue(0);
        setDefaultBarFgColor(Color.red, 1);
        
        return (SMA0, FMA0);
    }
} 

[ACM]

William
Post the efs that this script is calling.
Alex

Originally posted by whammer
Alex, the efsExternal call was able to pass the string through parameter. But because I had applied the external function to the chart as well and the aSymbol value was not set in the chart, so it returned null because of that chart. Now it works. Thanks.

A question regarding plotting different colors in different return values.

Below is an indicator function which is supposed to plot 2 MA's on the same chart. But it only plots one of the MA and not the other. Could you point out to me how I can correct it please?
Thank you.

W

function main(PriceSource, fastMA, slowMA) 
{
    if (getBarState() == BARSTATE_NEWBAR )
    {
        xFMA = efsExternal("MA_withgap.efs", PriceSource, fastMA, getSymbol());
        FMA0 = xFMA.getValue(0);
        setDefaultBarFgColor(Color.cyan, 0);
        
        xSMA = efsExternal("MA_withgap.efs", PriceSource, slowMA, getSymbol());
        SMA0 = xSMA.getValue(0);
        setDefaultBarFgColor(Color.red, 1);
        
        return (SMA0, FMA0);
    }
} 

[whammer]

Here it is.

function main(nPrice, MALength, aSymbol) {
    var hPrice=0, lPrice=0, oPrice=0, cPrice=0;
    var Price = new Array;

    if(nPrice == "close") {
        Price = getValue("close", 0, -MALength, aSymbol);
    }
    else if (nPrice == "hl/2") {
        hPrice = getValue("High", 0, -MALength, aSymbol);
        lPrice = getValue("Low", 0, -MALength, aSymbol);
        for (i=0; i<MALength; i++) {
            Price[i] = (hPrice[i] + lPrice[i])/2;  
        }
    }
    else if (nPrice == "oc/2") {
        oPrice = getValue("open", 0, -MALength, aSymbol);
        cPrice = getValue("close", 0, -MALength, aSymbol);
        for (i=0; i<MALength; i++) {
            Price[i] = (oPrice[i] + cPrice[i])/2;  
        }
    }
    if(MALength == null)
        MALength = 3;
    
    var temp=0;
    var vValue;
    
    for (i=0; i<MALength; i++) 
    { 
            temp += Price[i];    
    }
   
    return (temp/MALength);
} 

[ACM]

William
The calling efs is returning a single plot because you are not returning an array.
In the script replace return (SMA0, FMA0); with return new Array (SMA0, FMA0); and it should work fine
Alex

Originally posted by whammer
Here it is.

function main(nPrice, MALength, aSymbol) {
    var hPrice=0, lPrice=0, oPrice=0, cPrice=0;
    var Price = new Array;

    if(nPrice == "close") {
        Price = getValue("close", 0, -MALength, aSymbol);
    }
    else if (nPrice == "hl/2") {
        hPrice = getValue("High", 0, -MALength, aSymbol);
        lPrice = getValue("Low", 0, -MALength, aSymbol);
        for (i=0; i<MALength; i++) {
            Price[i] = (hPrice[i] + lPrice[i])/2;  
        }
    }
    else if (nPrice == "oc/2") {
        oPrice = getValue("open", 0, -MALength, aSymbol);
        cPrice = getValue("close", 0, -MALength, aSymbol);
        for (i=0; i<MALength; i++) {
            Price[i] = (oPrice[i] + cPrice[i])/2;  
        }
    }
    if(MALength == null)
        MALength = 3;
    
    var temp=0;
    var vValue;
    
    for (i=0; i<MALength; i++) 
    { 
            temp += Price[i];    
    }
   
    return (temp/MALength);
} 

[whammer]

I see. Thank you again, Alex! :-)

[ACM]

William
You are most welcome
Alex

Originally posted by whammer
I see. Thank you again, Alex! :-)