MA Study

[rcbenjamin]

The following EFS does not give a syntax error but when I put it in a chart it gives me an error that says, "C:/Users/Robert/Documents/Interactive Data/Formulas/My Formulas/17EMA-50MA.efs, line 54: Error: Failed to call 'MAStudy': parameter # 1 is invalid.". I am trying to subtract the difference between an exponential moving average and a simple moving average and put it on a chart as a histogram oscillator

var vLastAlert = -1;




function preMain() {

setPriceStudy(false);
setStudyTitle("MAxDiff");
setCursorLabelName("Diff", 0);
setCursorLabelName("Ave", 1);
setDefaultBarStyle(PS_SOLID, 0);
setDefaultBarStyle(PS_SOLID, 1);
setDefaultBarFgColor(Color.red, 0);
setDefaultBarFgColor(Color.blue, 1);
setDefaultBarThickness(1, 0);
setDefaultBarThickness(1, 1);
setPlotType(PLOTTYPE_LINE, 0);
setPlotType(PLOTTYPE_LINE, 1);

addBand(0, PS_SOLID, 2, Color.black)

}




function main(vEMA, vSMA, vAve) {

if (vEMA == null) vEMA = 250 ;
if (vSMA == null) vSMA = 625;
if (vAve == null) vAve = 100;


var vEMA = new MAStudy(vEMA, 0, "Close", MAStudy.EXPONENTIAL);
var vSMA = new MAStudy(vSMA, 0, "Close", MAStudy.SIMPLE);


var vIntEfs = efsInternal("Diff",vEMA, vSMA);
var vDiff = getSeries(vIntEfs,0);
var vDiffAve = sma(vAve,getSeries(vDiff),0);





return new Array(
vEMA.getValue(MAStudy.MA) - vSMA.getValue(MAStudy.MA),
vDiffAve
);

}




function Diff(veMA, vsMA){
var vEMA = new MAStudy(veMA, 0, "Close", MAStudy.EXPONENTIAL);
var vSMA = new MAStudy(vsMA, 0, "Close", MAStudy.SIMPLE);
return new Array (vEMA.getValue(MAStudy.MA) - vSMA.getValue(MAStudy.MA), 0);
}







function postMain() {

}




function onAction1() {
vLastAlert = 1;
}