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Another thread belongs to the past after v.4.58.
Great !!
Dimitris Tsokakis
--- In amibroker@xxxxxxxxxxxxxxx, "DIMITRIS TSOKAKIS" <TSOKAKIS@xxxx>
wrote:
> Tomasz,
> the problem is in this "already existing". Point A exists from the
> first ^NDX+^N225 scan. The next [^NDX only] scan will not "see" the
> 31/5/2004 and will leave it as is.The final result will be a bit
> absurd, an ^NDX scan will include 31/5 as if it was an ^NDX trading
> day.
> If, by mistake or by coincidence, ^N225 is a member of my WL, then
> 31/5 will appear in my N100 composites and, the more important, it
> will remain there for any next scan !!!
> These mistakes are common, especially when we scan WatchLists.
> [If "reset" was "delete" this problem would never appear again]
> Dimitris Tsokakis
> --- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko"
<amibroker@xxxx>
> wrote:
> > Dimitris,
> >
> > atcFlagResetValues just exactly what it says: resets all bars
> already existing in the composite
> > back to zero at the start of the scan. It does not delete
composite
> ticker, it just assigns zero
> > to all OHLCVOI fields in all bars that already exist in the
> composite.
> >
> > Best regards,
> > Tomasz Janeczko
> > amibroker.com
> > ----- Original Message -----
> > From: Dimitris Tsokakis
> > To: amibroker@xxxxxxxxxxxxxxx
> > Sent: Wednesday, June 23, 2004 8:53 AM
> > Subject: [amibroker] Reset action in AddToComposite() function
> >
> >
> > In
> > AddToComposite( array, "ticker", "field", flags =
> atcFlagDefaults )
> > description we read
> >
> > atcFlagResetValues = 1 - reset values at the beginning of scan
> (recommended)
> >
> > Should we delete ANY ~ticker BEFORE a new scan ?
> > What does reset means ?
> > Is it the same if we delete the ~ticker and scan again ?
> > The answer for the last question is not always positive.
> > Example :
> > Step1
> > Let us add ^NDX and ^N225 in WL1, use filter->Define->WL1 and
> scan with
> >
> > W=IIf(Name()=="^NDX",1,0);
> > AddToComposite(W*O,"~T","O",1);
> > AddToComposite(W*H,"~T","H",1);
> > AddToComposite(W*L,"~T","L",1);
> > AddToComposite(W*C,"~T","C",1);
> > AddToComposite(W*V,"~T","V",1);
> > Buy=0;
> >
> > The graph of ~T is in the att. gif.[upper graph]
> > There are some zero bars, point A for example [May31, 2004]
> > The last day of May was a trading day for ^N225 but not for
^NDX !
> > Since we scan for all quotations, ~T should be zero for
31/5/2004
> and it is OK.
> > Step2
> > Let us scan again now [without deleting the ~T ticker] ,
> selecting ^NDX as the current stock.
> > Point A will still be there, the "reset" action could not do
> anything for 31/5/2004, since this day was not an ^NDX day.
> > [the conclusion of step 2 is confusing at first sight, ~T do
> exist for 31/5/2004 although ^NDX was not there !!]
> > Step3
> > Let us delete ~T ticker, select ^NDX as the current stock and
> scan again.
> > The result is a perfect ^NDX chart, no "A" points at all.[lower
> graph]
> >
> > In similar cases, when missing or excessive data creates "A"
> points, the reset operation is not the expected and it is more safe
> to delete ~T tickers before a new scan.
> > I also think it should be explained in some next Users guide,
> AddToComposite() is a great tool and its description should be
> crystal clear !!
> > Dimitris Tsokakis
> >
> >
> > Check AmiBroker web page at:
> > http://www.amibroker.com/
> >
> > Check group FAQ at:
> http://groups.yahoo.com/group/amibroker/files/groupfaq.html
> >
> >
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