Error when referencing past data

[steven723]

From the formula below, I keep getting an error message when I try to refer to past data. Under Function diff, I am trying to subtract todays stoch from yesterdays. Can someone please let me know what I am doing wrong.

Thanks, Steven




function preMain() {
setStudyTitle("Stoch MACD");
setCursorLabelName("Stoch MACD");
setDefaultBarFgColor(Color.black, 0);

var fp1 = new FunctionParameter("nEMAlength", FunctionParameter.NUMBER);
fp1.setName(" EMA Length ");
fp1.setLowerLimit(2);
fp1.setDefault(14);

var fp2 = new FunctionParameter("nEMAsmoothing", FunctionParameter.NUMBER);
fp2.setName(" EMA Smoothing ");
fp2.setLowerLimit(1);
fp2.setDefault(7);
}


function main(nEMAlength, nEMAsmoothing) {
var dADA = ema(nEMAsmoothing,ema(nEMAlength,efsInternal("diff ")));

return dADA;
}

function diff() {
return stochK(17, 3, 1) - getValue( stochK(17, 3, 1), -1 );

}

[ckryza]

Steven:

Try:

function diff() {

     return stochK(17, 3, 1) - stochK(17, 3, 1, -1);

} 

Chris

[steven723]

Thanks Chris, it worked!

Steven