Plot issue with custom exponential indicator.

• 09/13/2017 at 9:17 PM #46171
  xel

  Good day folks!

  Im having a crazy issue with one of my custom indicators, The Exponential Deviation Band:

  EXPONENTIAL WEIGHTED DEVIATION BANDS

  // EXPONENTIAL WEIGHTED DEVIATION BANDS PRICE = LOG(customclose) // EWMA (EMA) EWMA = ExponentialAverage[Lookback](PRICE) // ELASTIC WEIGHTED STANDARD DEVIATION (ESD) alpha = 2/(Lookback+1) error = PRICE - EWMA dev = SQUARE(error) if barindex < Lookback then var = dev else var = alpha * dev + (1-alpha) * var[1] endif ESD = SQRT(var) // BANDS UB = EXP(EWMA + (DEVIATIONS*ESD)) BB = EXP(EWMA - (DEVIATIONS*ESD)) MID = EXP(EWMA) RETURN MID as "EVWMA", UB as "+ESD", BB as "-ESD"

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  // EXPONENTIAL WEIGHTED DEVIATION BANDS PRICE  = LOG(customclose) // EWMA (EMA) EWMA   = ExponentialAverage[Lookback](PRICE) // ELASTIC WEIGHTED STANDARD DEVIATION (ESD) alpha  = 2/(Lookback+1) error  = PRICE - EWMA dev    = SQUARE(error) if barindex < Lookback then var  = dev else var   = alpha * dev + (1-alpha) * var[1] endif ESD   = SQRT(var) // BANDS UB  = EXP(EWMA + (DEVIATIONS*ESD)) BB  = EXP(EWMA - (DEVIATIONS*ESD)) MID = EXP(EWMA) RETURN MID as "EVWMA", UB as "+ESD", BB as "-ESD"

  When applying the former one to normal series price, EDBands plots quite well but if you try to apply it to some other indicators, in particular to the Internal  ProRealTime (v10.3 – 1.8.0_45) “Historical Volatility” the bands just do not return any value at all.

  Screenshot added.

  Anything I am missing at coding..?

  Cheers everyone!

  

  xel

  Participant

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  09/15/2017 at 5:31 PM #46285
  Nicolas

  I did not test this quick fix, but you can try embed the whole code into these lines:

  if barindex>Lookback then // add the indicator code endif

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  if barindex>Lookback then // add the indicator code endif

   

  

  Nicolas

  Keymaster

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