I know PRT has an in-built Moving Average Ribbon indicator, but you can’t define the MA type (strange of them not to think of including that), nor can you make the respective MAs Volume-adjusted, i.e. VWAP. So I tried to do it myself. The code below is simple enough and looks right, but results in a peculiar calculation error. Can anyone figure it out? I’m stuck. Thanks in advance.

Variables are: UseVolumeAdjusted = true (Boolean); MAtype = 1 (Exponential); BasePeriod = 8; PeriodIncrement = 2.

Lookback1 = BasePeriod
Lookback2 = BasePeriod+(1*PeriodIncrement)
Lookback3 = BasePeriod+(2*PeriodIncrement)
Lookback4 = BasePeriod+(3*PeriodIncrement)
Lookback5 = BasePeriod+(4*PeriodIncrement)
Lookback6 = BasePeriod+(5*PeriodIncrement)
Lookback7 = BasePeriod+(6*PeriodIncrement)
Lookback8 = BasePeriod+(7*PeriodIncrement)
Lookback9 = BasePeriod+(8*PeriodIncrement)
Lookback10 = BasePeriod+(9*PeriodIncrement)

IF UseVolumeAdjusted = 1 THEN
MyMA1 = VolumeAdjustedAverage[Lookback1](Close)
MyMA2 = VolumeAdjustedAverage[Lookback2](Close)
MyMA3 = VolumeAdjustedAverage[Lookback3](Close)
MyMA4 = VolumeAdjustedAverage[Lookback4](Close)
MyMA5 = VolumeAdjustedAverage[Lookback5](Close)
MyMA6 = VolumeAdjustedAverage[Lookback6](Close)
MyMA7 = VolumeAdjustedAverage[Lookback7](Close)
MyMA8 = VolumeAdjustedAverage[Lookback8](Close)
MyMA9 = VolumeAdjustedAverage[Lookback9](Close)
MyMA10 = VolumeAdjustedAverage[Lookback10](Close)
ELSIF UseVolumeAdjusted = 0 THEN
MyMA1 = Average[Lookback1,MAtype](Close)
MyMA2 = Average[Lookback2,MAtype](Close)
MyMA3 = Average[Lookback3,MAtype](Close)
MyMA4 = Average[Lookback4,MAtype](Close)
MyMA5 = Average[Lookback5,MAtype](Close)
MyMA6 = Average[Lookback6,MAtype](Close)
MyMA7 = Average[Lookback7,MAtype](Close)
MyMA8 = Average[Lookback8,MAtype](Close)
MyMA9 = Average[Lookback9,MAtype](Close)
MyMA10 = Average[Lookback10,MAtype](Close)
ENDIF

RETURN MyMA1 COLOURED (255,255,0) AS "MA1", MyMA2 COLOURED (238,130,238) AS "MA2", MyMA3 COLOURED (64,224,208) AS "MA3", MyMA4 COLOURED (135,206,235) AS "MA4", MyMA5 COLOURED (255,0,0) AS "MA5", MyMA6 COLOURED (160,32,240) AS "MA6", MyMA7 COLOURED (218,112,214) AS "MA7", MyMA8 COLOURED (255,200,0) AS "MA8", MyMA9 COLOURED (255,0,255) AS "MA9", MyMA10 COLOURED (144,238,144) AS "MA10"