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BarCount does not represent number of bars in the DATABASE,
but in the ARRAYs in current execution.
The arrays have DYNAMIC size depending on zoom factor. That's why BarCount may and will vary.
For example if you have 20 years of data and you are watching just
the last year
AmiBroker does not need and does not use all bars in the database to calculate
indicators for last year.
It uses last year only PLUS some previous bars required to "stabilise" indicator values.
The number of extra bars depends on functions you use in the formula.
If you want to use truly all bars you need to use SetBarsRequired function:
http://www.amibroker.com/f?setbarsrequired
Best regards,
Tomasz Janeczko
amibroker.com
----- Original Message -----
From: "oneklema" <andy@xxxxxxxxxxx>
To: <amibroker@xxxxxxxxxxxxxxx>
Sent: Friday, September 07, 2007 3:45 PM
Subject: [amibroker] Simple question about BarCount
>I have what should be a simple question about BarCount but cannot get
> a definitive answer from the AB documentation. FYI, I am working on
> daily data.
>
> What exactly does BarCount represent? The AB help says:
>
> BarCount constant gives the number of bars in array (such as Close,
> High, Low, Open, Volume, etc). Array elements are numbered from 0
> (zero) to BarCount-1.
>
> So, I understand that it is the size of the arrays (I'm an old C
> programmer). But, I assumed that if I have a loop such as:
> for (i = 0; i < BarCount, i++)
> {
> do work on C[i];
> }
>
> I would do work on every Close value that is *in the database for the
> symbol that is opened*. But, it does not seem to work this way (?).
>
> When I print out the value of BarCount, I notice that it changes as I
> change the Zoom factor (i.e., clicking +,-). And, the only way to get
> BarCount to reflect all data is to zoom as as far as it can go. So, I
> thought maybe it represents the number of bars displayed as adjusted
> by the zoom. But, from a visual inspection, it is obviously not that
> (maybe related, but not exact).
>
> Is there any way to operate on symbol data for all data that has been
> loaded into the database, regardless of the zoom factor?
>
>
>
> Please note that this group is for discussion between users only.
>
> To get support from AmiBroker please send an e-mail directly to
> SUPPORT {at} amibroker.com
>
> For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
> http://www.amibroker.com/devlog/
>
> For other support material please check also:
> http://www.amibroker.com/support.html
>
> Yahoo! Groups Links
>
>
>
>
>
Please note that this group is for discussion between users only.
To get support from AmiBroker please send an e-mail directly to
SUPPORT {at} amibroker.com
For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
http://www.amibroker.com/devlog/
For other support material please check also:
http://www.amibroker.com/support.html
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