[amibroker] Finding number of bars in Opening Range

["hrokling" <henning@xxxxxxxxxxxx>]

Using 1-minute data I'm calculating the High and Low of the Opening 
Range. However, due to the fact that different stocks open at 
different times (NYSE etc) one can never be certain exactly how many 
bars of 1-minute data one has between 09.30 and 10.00 am EST. If I 
try setting NumBars to 30 for instance, the bars from the day before 
is included. Here's what I'm doing:

DayChange = DateNum() != Ref(DateNum(),-1);

OpeningRange = (TimeNum() >= 153000 AND TimeNum() <= 160000);
BarsSinceEndOpeningRange = BarsSince (OpeningRange>0);

FirstBarInOpeningRange = ValueWhen (DayChange=1,BarIndex());
LastBarInOpeningRange = ValueWhen  (TimeNum()=160000,BarIndex());

NumBars = FirstBarInOpeningRange - LastBarInOpeningRange;

OpeningHigh = Ref (HHV (H, NumBars), - BarsSinceEndOpeningRange);
OpeningLow  = Ref (LLV (L, NumBars), - BarsSinceEndOpeningRange);




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