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Tip: How to make NinjaTrader’s ROC indicator to calculate the difference in points?

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    Tip: How to make NinjaTrader’s ROC indicator to calculate the difference in points?

    You may or may not know that NinjaTrader’s ROC indicator calculates the ROC only in percentage, not in points. I wasn’t (and I blame the Help Guide for not pointing it out clearly ). I didn’t find it out until I looked at the source code in the NinjaScript Editor after much frustration. Therefore, my bonus tip (which I think is more valuable) is: always take a look at the source code if you are not sure about what a built-in indicator does.

    Coming back to the built-in ROC indicator, it uses the following formula:

    (Input[0] - Input[barsAgo]) / Input[barsAgo]) * 100

    This returns the ROC in percentage, not in points. It is not that difficult to create a new indicator that calculates the ROC in points using the following formula:

    Input[0] - Input[barsAgo]

    However, there is an easier way. You can “force” the built-in indicator to return the ROC in points by replacing

    ROC(myInput, myPeriod)[0]

    with

    ROC(myInput, myPeriod)[0] * myInput[myPeriod] / 100.

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