getting previous value from an efsExternal on specific period.

[Kent.B.Bothered]

Hi All,

I am hoping someone may be able to help with this one. Please excuse me if this is very 101 but I am not a programmer and kind of fumbling my way through this.

What I am trying to achieve is to get the value of the previous bar of an external EFS script (for a specific interval, in this case 15). I have read this great post and I thought that I was doing everything right:

http://forum.esignalcentral.com/printthread.php?threadid=12752&perpage=5

function main() {

    var xSVERSI15  = efsExternal( "Sve_InvFish_Rsi.efs", 4, 4,inv(15));
    var sSVERSI15 = getSeries(xSVERSI15,0);
    var prevSVERSI15 = sSVERSI15.getValue(-1);

    debugPrintln(prevSVERSI15);

} 

I'm not sure why I get null from the above.

The external function (as far as I can tell) has only one element. I have tried getSeries with and without the ,0.

I have attached the external efs. I'll be very grateful for any insights into where I am going wrong, or even if what I am trying to do is possible or not.

Many Thanks

KBB

[ACM]

KBB
As far as I can see the script you posted is working and is printing values from the debug statement (see following screenshot)



That said it could be simplified (and made more efficient) as follows. Unless you need to plot the return of your script (or the called efs returns more than one element which is not the case in this instance) you do not need to call the series using the getSeries() function

var xSVERSI15 = null;

function main() { 
    
    if(xSVERSI15==null) xSVERSI15 = efsExternal( "Sve_InvFish_Rsi.efs", 4, 4,inv(15)); 
    var prevSVERSI15 = xSVERSI15.getValue(-1); 

    debugPrintln(prevSVERSI15); 

} 

As to the nulls you may need to provide more details on how you are running the script and where you are seeing them
Alex

Hi All,

I am hoping someone may be able to help with this one. Please excuse me if this is very 101 but I am not a programmer and kind of fumbling my way through this.

What I am trying to achieve is to get the value of the previous bar of an external EFS script (for a specific interval, in this case 15). I have read this great post and I thought that I was doing everything right:

http://forum.esignalcentral.com/printthread.php?threadid=12752&perpage=5

function main() {

    var xSVERSI15  = efsExternal( "Sve_InvFish_Rsi.efs", 4, 4,inv(15));
    var sSVERSI15 = getSeries(xSVERSI15,0);
    var prevSVERSI15 = sSVERSI15.getValue(-1);

    debugPrintln(prevSVERSI15);

} 

I'm not sure why I get null from the above.

The external function (as far as I can tell) has only one element. I have tried getSeries with and without the ,0.

I have attached the external efs. I'll be very grateful for any insights into where I am going wrong, or even if what I am trying to do is possible or not.

Many Thanks

KBB

[Kent.B.Bothered]

Hi Alex,

LOL. Thank you so much, I did mention that I'm fumbling, right?

This is quite embarrassing but I thought the script output window (where I was getting null) was the same as the Formula Output.

I can see the output now...and work magic on it. This is great, thanks again.

KBB

[ACM]

KBB
You are welcome
Alex

Hi Alex,

LOL. Thank you so much, I did mention that I'm fumbling, right?

This is quite embarrassing but I thought the script output window (where I was getting null) was the same as the Formula Output.

I can see the output now...and work magic on it. This is great, thanks again.

KBB