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Hi - Probably best to start at the beginning. TJ invented QuickAFL to reduce
the time it takes charting code to execute. It is turned on by default in
charting ( AA does not currently use it ). It works by creating smaller
arrays from your full arrays and operating on them instead. The smaller
arrays consist of the bars you can see plus some number of bars immediately
preceding them which are used to "initialize" the arrays so correct values
are achieved by the time they reach the first visible bar. But certain
applications/formulas need to use more bars so TJ provided SetBarsRequired()
so you can specify more bars if you need to. As a practical matter, I think
most people use it to just "shut off" QuickAFL by using numbers larger than
the size of their entire array, then AB will just use all bars. So yes it
will slow down code execution as it defeats the purpose that QuickAFL was
invented for.
Re crosses changing bars, I don't think that should happen, I would guess it
probably means you are not using enough bars. Tough to know what is
happening without your code, and not sure I would know what is happening
behind the scene even if I did have it. You could try playing around with
different values to see what happens...
Steve
----- Original Message -----
From: "sidhartha70" <sidhartha70@xxxxxxxxx>
To: <amibroker@xxxxxxxxxxxxxxx>
Sent: Wednesday, June 04, 2008 2:10 PM
Subject: [amibroker] SetBarsRequired()...?
> Hi All,
>
> I'm a little confused about the use of SetBarsRquired()... How do I
> know specifically when I need to use it...? And How do I know how many
> bars to specify IF I do need to use it...??
>
> Also, doesn't it really very significantly slow code execution
> down...? From my experimentation, it seems to.
>
> I currently have some indicators plotting (e.g. fast and slow lines
> crossing) and the exact bar on which a cross occurs seems to move as I
> scroll backwards and forwards along a chart....
>
> Any ideas...?
>
>
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> For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
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>
>
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Please note that this group is for discussion between users only.
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