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quickAFL makes drawing charts faster because it only uses the bars on
screen, plus a few more. This is ok for simple charts, but for ones
that need to use all of the bars in the database, like those with
loops that rely on the previous values to determine future values it
falls down. So you use the setbarsrequired to overcome the effects of
quickafl. It has been discussed within the group in the past, and the
change logs for AB versions does have some information when the
quickafl was permanently turned on.
setbarsrequired is one of the standard lines I now have in almost all of my afl
--
Cheers
Graham
AB-Write >< Professional AFL Writing Service
Yes, I write AFL code to your requirements
http://e-wire.net.au/~eb_kavan/ab_write.htm
On 10/10/05, m_visto <mvisto@xxxxxxxxx> wrote:
> Thanks Graham,
>
> Great, Adding the SetBarsRequired(10000,10000) fixes the problem. But
> that still doesn't tell me what quickafl is doing.
>
> Would I be correct in assuming that only a portion of the array is
> being calculated? The first pass must be the entire array and then
> subsequent refreshes must only be some portion of the array. If so,
> how is that portion of the array determined? And also, does quickafl
> only affect array processing procedures and not loop processing?
>
> Thanks again,
>
> Marty.
>
> --- In amibroker@xxxxxxxxxxxxxxx, Graham <kavemanperth@xxxx> wrote:
> >
> > have you added to your code to oercome the quickafl
> >
> > SetBarsRequired(10000,10000);
> >
> > On 10/10/05, William Peters <william@xxxx> wrote:
> > > Hi Marty,
> > >
> > > Would it be possible for you to post the code as it stands. Your code
> > > is attempting to access an array element which is currently not within
> > > the bounds of the array.
> > >
> > >
> > >
> > > Regards,
> > > William Peters
> > > http://www.amitools.com
> > >
> > >
> > >
> > >
> > > Sunday, October 9, 2005, 2:28:48 PM, you wrote:
> > > m> Hi,
> > >
> > > m> Last week I asked how AFL runs with real time data coming in. I
> > > m> assumed that every time a new piece of data is obtained that the
> > > m> entire AFL program runs from the first line to the last. But
> > > m> something else seems to be happening.
> > >
> > > m> I have an AFL program that determines Swing Highs and Lows.
> Most of
> > > m> the programming uses array processing. But I needed to use a
> for loop
> > > m> through the array to find where multiple swing highs occurred
> without
> > > m> a swing low between them. I then modify the array to only keep the
> > > m> highest swing high or the last swing high if the highs are
> equal. I
> > > m> am using BarIndex() to identify the bars on which the swing
> highs occur.
> > >
> > > m> The program works fine the first time I drop it on the chart. But
> > > m> then, if I click to select a bar on the chart, I get an error that
> > > m> array subscript is out of bounds.
> > >
> > > m> If the program is running from the first line to the last line
> every
> > > m> time there is new data (or when I select a bar on the chart), then
> > > m> this would not be possible. So something else must be going on
> where
> > > m> only a portion of the code is being executed.
> > >
> > > m> It seems that this might have something to do with QuickAFL
> mentioned
> > > m> on the BarIndex() help screen, but I could not find any
> information
> > > m> about QuickAFL or what is necessary to work around it.
> > >
> > > m> How exactly does QuickAFL work if that is what is my problem? Are
> > > m> only some parts of the AFL program being run while other parts are
> > > m> ignored/skipped because the values are thought to not have
> changed?
> > > m> Does QuickAFL affect both array and loop processing?
> > >
> > > m> Any other tips or thoughts that I need to consider?
> > >
> > > m> Thank-you,
> > >
> > > m> Marty.
> > >
> > >
> > >
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