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Hello,
No these two are not the same.
BarIndex() is an index of current QUOTE bar
- ARRAY. It is equivalent to Cum(1)-1. This counts
bars from the very first bar to the very last bar.
BarCount is a CURRENT SIZE of array (single NUMBER)
In Indicator Builder the arrays used for calculations
may be SMALLER than number of quotes when QuickAFL feature is enabled.
Enable QuickAFL(tm) for indicators - this turns on QuickAFL(tm) feature that causes faster charts redraws. QuickAFL works so it
calculates only part of the array that is currently visible. If you use this feature and your formulas are script based you should
add SetBarsRequired function to your code. Recommended especially when you work with data that have more than 10000 bars. Note: for
certain indicators requiring recursive calculation, enabling this feature may lead to small (less than 0.05%) differences in values
of indicators (not visible for the eye), due to the fact that not all bars available are included in the calculation.
See also comment to BarCount in "what's new section":
- added built-in constant 'BarCount' that returns number of bars available in arrays (the number of elements of array)
When QuickAFL is turned on it may be less than true number of bars because QuickAFL feature attempts to use only visible bars (and
few before). You can control how many bars the formula requires using SetBarsRequired() function
And see this too: http://www.amibroker.com/guide/afl/afl_view.php?name=SETBARSREQUIRED
Best regards,
Tomasz Janeczko
amibroker.com
----- Original Message -----
From: "jtelang" <jtelang@xxxxxxxxx>
To: <amibroker@xxxxxxxxxxxxxxx>
Sent: Sunday, September 14, 2003 8:09 PM
Subject: [amibroker] BarCount problem... (Was: Re: Strange behavior...)
> TJ,
>
> The problem I'm experiencing seems to be related to BarCount's value.
> I'm seeing following behavior with multiple databases.
>
> If I plot BarIndex() and BarCount values (with default DB that came
> with the install) as -
>
> Plot(BarIndex(), "BI", colorBlue);
> Plot(BarCount, "BC", colorRed);
>
> - what I see is that BC starts with 159 at the start of the chart,
> increases by 1, until it reaches 189 and stays there. In the
> meanwhile, BI starts with zero, crosses BC at 189, and goes all the
> way to 356.
>
> Isn't BC always supposed to be 357? Do you have any idea what could
> be causing this? Like I said, I see similar behavior with any DB that
> I use. I'm using 4.41 Beta (built on 9/2).
>
> Another interesting thing to note is that when I insert this
> indicator, BC does show 357 as the value, but as soon as I click
> anywhere in the chart, it shows the values as described above.
>
> TIA.
>
> Jitu
>
> --- In amibroker@xxxxxxxxxxxxxxx, "jtelang" <jtelang@xxxx> wrote:
> > Typo in the pseudo-code. It should read -
> >
> > -------
> >
> > handle = LoadTableAndGetHandle();
> > col = GetWhichColToDisplay();
> > val = 0; // Value to display
> >
> > for( i = 0; i < BarCount; i++ ) {
> > val[i] = GetValFromTable(handle, i, col); // i being the row
> > }
> >
> > ------
> > --- In amibroker@xxxxxxxxxxxxxxx, "jtelang" <jtelang@xxxx> wrote:
> > > TJ,
> > >
> > > I'm using a ABTool-managed, externally stored table to store some
> > > calculated data for each symbol. When I try to display a value in
> > the
> > > column from an indicator, I see a rather strange behavior. Say my
> > > indicator is something like following pseudo-code -
> > >
> > > ----------
> > >
> > > handle = LoadTableAndGetHandle();
> > > col = GetWhichColToDisplay();
> > > val = 0; // Value to display
> > >
> > > for( i = 0; i < BarCount; i++ ) {
> > > val = GetValFromTable(handle, i, col); // i being the row
> > > }
> > >
> > > -----------
> > >
> > > When I first time insert this indicator, a plot gets created with
> > > values shown. However as soon as I click somewhere else in the
> > chart,
> > > all values displayed drop to zero (may be because I initialized
> it
> > to
> > > zero?). Then onwards, if I click "Edit Formula" again and hit
> > Apply,
> > > the values flash on the chart for a fraction of a second, and
> then
> > > disappear.
> > >
> > > I'm not sure if this is ABTool problem (I've posted a question on
> > > their list to figure out what the best way to display the values
> > is),
> > > but what could cause the chart to behave this way? I've tried a
> > > number of things, such as defining handle as "handle[0]" to see
> if
> > it
> > > loads the file only once, or just loading it inside the loop only
> > > when "i == 0" and then reusing the handle value, etc, but to no
> > avail.
> > >
> > > Any ideas?
> > >
> > > TIA,
> > >
> > > Jitu
>
>
>
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