Bandwidth

[indjd]

I made a stab at modifying the bandwidth efs file, as follows:


function preMain() {
setStudyTitle("Lowest BandWidth");
setCursorLabelName("Low BW", 0);
setCursorLabelName("Floor", 1);
}

var bb = new BollingerStudy(20, "Close", 2.0);

function main() {
var vUpper = bb.getValue(BollingerStudy.UPPER);
var vLower = bb.getValue(BollingerStudy.LOWER);
var vMiddle = bb.getValue(BollingerStudy.BASIS);

var Bndwidth = efs("/Bollinger/Bandwidth.efs",0);
var low_bw = llv(50,Bndwidth);


if(vUpper == null || vLower == null || vMiddle == null)
return 0.0;

return new Array((vUpper - vLower) / vMiddle * 100, 0.0, low_bw);
}

What I'd like to do, however, is color the line a different color when the bandwidth is equal to the lowest bandwith. Also, I'd like to be able to modify the low_bw (or the lookback number) via the Formula Parameters in Study Properties dialog box.

What am I missing?

Thanks.

Harold Harper
[email protected]

[ACM]

Harold
To add a user definable parameter for the lookback add the following lines to preMain()

var fp1 = new FunctionParameter("Lookback", FunctionParameter.NUMBER);
    fp1.setLowerLimit(1);        
    fp1.setDefault(50); 

Then add Lookback in the brackets of function main() ie it should become function main(Lookback).
Lastly replace llv(50,Bndwidth); with llv(Lookback,Bndwidth);
To color the line based on your condition add the following line just above the return statement

if((vUpper - vLower) / vMiddle * 100==low_bw) setBarFgColor(Color.red,2); 

That should provide you with all the changes you wanted
Hope this helps
Alex