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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 Tsokakis
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