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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 Janeczkoamibroker.com
<BLOCKQUOTE
>
----- Original Message -----
<DIV
>From:
Dimitris
Tsokakis
To: <A title=amibroker@xxxxxxxxxxxxxxx
href="">amibroker@xxxxxxxxxxxxxxx
Sent: Wednesday, June 23, 2004 8:53
AM
Subject: [amibroker] Reset action in
AddToComposite() function
InAddToComposite( 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
: Step1Let us add ^NDX and ^N225 in WL1, use
filter->Define->WL1 and scan with
<FONT
size=2>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.Step2Let 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 !!]Step3Let 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 TsokakisCheck
AmiBroker web page at:<A
href="">http://www.amibroker.com/Check
group FAQ at: <A
href="">http://groups.yahoo.com/group/amibroker/files/groupfaq.html
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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