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Have a look at the following article and see if it helps clear things up for you.
http://www.amibroker.com/kb/2008/07/03/quickafl/
Mike
--- In amibroker@xxxxxxxxxxxxxxx, "zdomokos" <zdomokos@xxx> wrote:
>
> How does the system calculates BarCount in different modes, and how does in know when to use what. What is the relationship between BarCount and BarIndex, and how shall I know when to use what?
> I noticed, when BarCount is queried in a chart, it returns the count to the drawn bars, when in exploration then the whole length of the array. Therefore when I use the same afl to plot and explore, barcount has different values.
>
> Can somebody explain what goes on in the AFL engine when the afl is running inside an indicator? How do the arrays get calculated? Are they calculated for the whole length (max BarIndex()) or just for the BarCount which in indicator mode is much shorter then in other modes.
>
> Thanks.
>
>
>
> This is that made me wonder:
>
> Title +="\nfirstvisiblebarindex= "+firstvisiblebarindex+
> "\nfirstvisiblebar= "+firstvisiblebar+
> "\nLastvisiblebar= "+lastvisiblebar+
> "\nLastvisiblebarindex= "+lastvisiblebarindex+
> "\nBarindex= "+BarIndex()+
> "\nBarcount= "+BarCount +
> "\nBarIndexMax= "+LastValue( BarIndex() );
>
> and this is what I get on the chart:
>
> firstvisiblebarindex= 1528
> firstvisiblebar= 31
> Lastvisiblebar= 189
> Lastvisiblebarindex= 1686
> Barindex= 1533
> Barcount= 180
> BarIndexMax= 1676
>
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