EMA Indicator

[mstuhr]

I want to use current price bar's high minus a 13-bar EMA of closing prices and plot it as a green bar.

In Metastock the formula is (H-Mov(C,13,E)/1.

This is my first attempt at writting an EFS Indicator

Thanks
Mike

[emet]

Mike,

It should be something like this, please let me know how it works.

var fpArray = new Array();

function preMain() {

    setPriceStudy(false);
    setStudyTitle("Hight and 13 EMA");
    setCursorLabelName("H13EMA",0);
    setDefaultBarFgColor(Color.lime,0);
    setPlotType(PLOTTYPE_HISTOGRAM,0); 
    setDefaultBarThickness(1,0);
    askForInput();
    
    var x=0;
    fpArray[x] = new FunctionParameter("Length_EMA", FunctionParameter.NUMBER);
    with(fpArray[x++]){
        setLowerLimit(1);        
        setDefault(13);
    }
   
}

function main(Length_EMA) {

   return high(0) - ema(Length_EMA);
    
} 

EMET