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Re: [amibroker] detecting un-initialized, or {EMPTY}, array element
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When everything fails - check the manual:
Best regards,
Tomasz Janeczko
amibroker.com
----- Original Message -----
Sent: Saturday, September 12, 2009 2:06
PM
Subject: [amibroker] detecting
un-initialized, or {EMPTY}, array element
Say,
I have a strategy based on more than one securities and indicators with
different lookbacks.
BuySignal = fn(Price1, Price2, MA, STDEV,
etc);
In order to calculate annualized profit in my backtests (and for
other purposes), I want to find the date of the first bar when the system
actually have enough data to provide signals. This date will depend on the the
start of the backtest range, presence of data in the database, some securities
may have started to trade only recently, lookback periods etc etc.
My
idea was to loop through BuySignal and see when it ceases to be {EMPTY}. I
tried checking if BuySignal != Null and some other stupid things, but
none worked. I ended up doing this (full snippet below):
dt=DateTime();
for( i = 0; i < BarCount; i++ )
{
if( WriteVal(BuySignal[i]) !=
"{EMPTY}"
)
{
bo.addCustomMetric("Start date",
WriteVal(dt[i],formatDateTime));
break;
}
}
Now, there ought to be a more direct and
efficient way to check if the array element is initialized, not involving
formatting. Anyone?
Also, maybe there's some built-in functionality to
find what I need without looping?
Cheers!
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