ROC of an Indicator

[TURLIES]

Hi,
Is it possible to calculate the ROC of an Indicator? :

Eg : ( RSI Close() - RSI Close (-1) )

Paul

[ACM]

Paul
Would this do?
Alex

var vRSI14 = new RSIStudy(14, "Close");

function preMain() {
 
    setPriceStudy(false);
    setStudyTitle("RSI diff");
    setCursorLabelName("RSI diff", 0);
    setDefaultBarStyle(PS_SOLID, 0);
    setDefaultBarFgColor(Color.blue, 0);
    setDefaultBarThickness(1, 0);
    setPlotType(PLOTTYPE_LINE, 0);
}

function main() {
 
    var vDiff = vRSI14.getValue(RSIStudy.RSI)-vRSI14.getValue(RSIStudy.RSI, -1)
        
    return vDiff;
} 

[TURLIES]

Hi Alex,
Spot on - thanks.
I knew it was something straightforward. Can you adjust it so that it can work with a user defined symbol other than the chart it is being plotted on?

Thanks,
Paul

[ACM]

Paul
Not sure it can be done using the builtin. Maybe someone else has a better solution
Alex

[TURLIES]

Hi Alex,
I'm already using an efs which allows the symbol to be input directly (see attached). I didn't know whether a Builtin study would be more robust/efficient (CPU wise) for completing this task- or exactly the same?

Also, I'd have no idea how to add RSI ROC into this formula, so i needed the previous Builtin formula you supplied anyway.

I've another general question : - in formulas i've created, i haven't been able to do a comparison to the previous output (like a ROC of the formula) :

Eg : output = vValue
comparison = vValue(-1)

ROC = vValue - vValue(-1)

Does this have to be put into any array to hold the previous vValue(-1), so it can be used in the calculation? I tried different things but have had no success.

Thanks,
Paul