Narural Log spread

[ectrader]

Hi, I am not familiar with EFS, but could someone point out a EFS Study that takes the natural log of one symbol by another: LN (6E M0/6A M0).
I have gone through all the spread overlay but nothing like this.
Thank you

[waynecd]

Hi ectrader,

I'm not a mathematician nor an expert efs programer but try this.
The efs is also attached.

debugClear();
function main(){
    vLog = efsInternal("getLog");
    return vLog;
}
function getLog() {
    var C6E = close(0,sym("6E #F"));
    var C6A = close(0,sym("6A #F"));
    var xDiv = C6E/C6A;
    return Math.log(xDiv);
} 

Note definition of -Math.log(x)- "Returns the natural logarithm (base E) of a number."

Wayne

[ectrader]

Thank you very much Wayne!!!

[ectrader]

Hi Wayne,
just one last questions. If i wanted to see an RSI on this Log spread, would I be able to simply replace the 'close' on the RSI function by 'geLog'?
Thanks and apologies for asking such basic coding queries....

[waynecd]

Here is an efs that gives you the menu choice of plotting either the Log or the RSI of the Log. Plotting them both at the same time doesn't work because the RSI is orders of magnitude less than the Log so it appears as a horizontal line at the bottom of the study pane.

If you want to see them both, each in it's own pane then load the study twice and select "Log" for one pane and "RSI of Log" for the other.

Wayne

debugClear();
var aFPArray = new Array();
function preMain() {
    setPriceStudy(false);
    var x=0;
    aFPArray[x] = new FunctionParameter( "Display_What", FunctionParameter.STRING); 
    with( aFPArray[x++] ) { 
        setName( "Display What" ); 
        addOption( "Log" ); 
        addOption( "RSI of Log" ); 
        setDefault( "RSI of Log" ); 
    }   
}
var bInit = false;
var vLog = null;
var vRSI = null;

function main(Display_What){
    if(bInit == false){
        vLog = efsInternal("getLog");
        vRSI = rsi(14,vLog);
    }
    //uncomment the next line if you want to see generated values in the -Formula Output- window
    //debugPrintln("vRSI = "+vRSI.getValue(0)+" - vLog = "+vLog);
    if(Display_What == "Log") return vLog;
    else if(Display_What == "RSI of Log") return vRSI;
}
function getLog() {
    var C6E = close(0,sym("6E #F"));
    var C6A = close(0,sym("6A #F"));
    var xDiv = C6E/C6A;
    return Math.log(xDiv);
}
/*
debugPrint() output
vRSI = 44.193056814580615 - vLog = 0.3979090438410414
vRSI = 44.10791466967953 - vLog = 0.3977994247672128
vRSI = 44.10791466967953 - vLog = 0.3977994247672128
vRSI = 44.10791466967953 - vLog = 0.3977994247672128*/ 

[ectrader]

Wow, thanks a milion Wayne....very kind of you!