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If you place the same value in all fields using X, the OHLC there will never
be a conflict. To keep the OHLC Composites unique you can attach the field
letter (OHLC) to the Composite name. But if you change the close of a bar
below the Low or above the high then of course results "will be strange" as
Tomasz mentioned.
At the time ( i was just learning too) I may have been wrong about OHLC
error checking... of hand i can't tell you, perhaps somebody else can jump
in here and explain if there is any price checking going on.
best regards,
herman.
-----Original Message-----
From: Paul A. [mailto:amibroker@xxxxxxxxxxxxx]
Sent: Monday, October 04, 2004 2:11 PM
To: amibroker@xxxxxxxxxxxxxxx
Subject: [amibroker] ATC: can I assign to open, high, low, close?
From Herman's excellent (thank you, Herman!) "Introduction to the AB
AddToComposite()" article, p.10:
"The OHLC fields have certain mathematical relationships that restrict
their use and prohibit you from putting random numbers in all fields. Due
to inherent error checking of the arrays by AB the results may be
unpredictable if you ignore this. The easiest way is to use the "X" field
designator; it fills all four price fields (OHLC) with the same values and
no conflicts will arise."
In the same article a few lines later, on p.11, a special note from Tomasz
on the subject seems to contradict the above, though, and implies that
there is no error-checking:
"Volume and open interest fields are 'independent'. Although you can put
your composites in any of OHLCVI fields the close field is related to
high/low fields, and if you store the values only in close field without
changing H/L and try to display candlesticks out of it - the results will
be strange."
My question: which is it? Is Herman correct: are the results of assigning
random values to OHLC going to be unpredictable due to an undocumented
error-checking algorithm that could change some of the values? If so,
does
someone know what the exact error-checking algorithm is and under what
circumstances it runs, please?
Or, is Tomasz correct: the results of assigning random values to the OHLC
fields will be uneventful and very predictable, but of course strange as
heck if you try to chart them as candlesticks?
Thanks for any comments.
-Paul
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