keltner bands

[chevymike]

/**
Copyright © eSignal, a division of Interactive Data Corporation. 2002. All rights reserved. 
This sample eSignal Formula Script (EFS) may be modified and saved under a new 
filename; however, eSignal is no longer responsible for the functionality once modified.
eSignal reserves the right to modify and overwrite this EFS file with each new release.
*****************************************************************************************************/
function preMain() {
    setPriceStudy(true);
    
    /* Set the title that will appear in the study pane */
    setStudyTitle("Keltner");

    /* Set the label that will appear in the cursor window */
    setCursorLabelName("K-Upper", 0);
    setCursorLabelName("K-Basis", 1);
    setCursorLabelName("K-Lower", 2);

    setDefaultBarFgColor(Color.blue, 0); // upper
    setDefaultBarFgColor(Color.red, 1); // basis
    setDefaultBarFgColor(Color.blue, 2); // lower
}


function main(nInputLength) {
    if(nInputLength == null)
        nInputLength = 1.3;
    if(nInputLength <= 16)
        nInputLength = 1.3;


    var dHigh = high(0, -nInputLength);
    var dLow = low(0, -nInputLength);
    var dKeltnerBasis= call("KeltnerEMA.efs", nInputLength);
    if(dHigh == null || dLow == null || dKeltnerBasis == null)
        return;

    var dHminL = 0;
    var i;

    for(i = 0; i < nInputLength; i++) {
        dHminL += dHigh[i] - dLow[i];
    }

    dHminL /= nInputLength;


    return new Array(dKeltnerBasis + dHminL, dKeltnerBasis, dKeltnerBasis - dHminL);
} 

I would like to change the setting of the study. I would like the upper and lower bands at 1.3 multiplier, and the mid band at 16. I tried to change the ninputs but it give me an error. Can you help me fix this please?

[ACM]

chevymike
Replace the following section of code

if(nInputLength == null)
nInputLength = 1.3;
if(nInputLength <= 16)
nInputLength = 1.3; 

with

if(nInputLength == null)
nInputLength = 16; 

and replace the return statement with the following.

return new Array(dKeltnerBasis + (dHminL*1.3), dKeltnerBasis, dKeltnerBasis - (dHminL*1.3)); 

FYI you can find here a Keltner Channel script that already includes a user definable parameter for the multiplier of the bands
Alex