Joe,
Try a combination of CategoryGetSymbols and CategoryRemoveSymbol. Use the
code in the example code in CategoryGetSymbols
and iterate through the symbols that are retrieved from the Watchlist. For
each symbol in the loop, call CategoryRemoveSymbol
to remove that symbol from the watchlist. For example, assuming that your
target watchlist is “5”:
TargetListNum = 12;
list = CategoryGetSymbols( categoryWatchlist,
TargetListNum );
for( i = 0; ( sym = StrExtract( list, i ) ) != ""; i++ )
{
CategoryRemoveSymbol(sym, categoryWatchlist,
TargetListNum );
}
Note – You can create this as a
function and pass the List Num or you can create a Param and change it dynamically.
Regards,
Dan.
From:
amibroker@xxxxxxxxxxxxxxx [mailto:amibroker@xxxxxxxxxxxxxxx] On Behalf Of Joe Landry
Sent: Thursday, June 23, 2005 6:25
PM
To: amibroker@xxxxxxxxxxxxxxx
Subject: Re: [amibroker] AmiBroker
Performance Continued -- What Settings are Fastest?
Thanks for posting this, it is really
useful and will circulate to our local group.
If you're running these screens on a
daily basis, is there a way "programatically" to
erase the subject watchlist, that is 'make
empty' so that you have a fresh set of tickers that meet
your criteria each time you run this
code.
----- Original Message -----
Sent: Thursday, June 23,
2005 3:24 PM
Subject: RE: [amibroker]
AmiBroker Performance Continued -- What Settings are Fastest?
Tomasz and others:
This is a very interesting and helpful discussion.
I am
sure I speak for many others.
Since my current system is limited to 1.5 GB of
RAM, I have
also used special watchlists to reduce the number
of stocks
that AB needs so everything fits into RAM.
Here is a snip of AFL to give the idea how these
watchlists
can be created. The key is to use "CUM"
to find any stock
that needs to be in the watchlist.
Watch for line wrap problems when copying the
code.
b
//----------------------------------------------
//For increased testing speed,
//it is helpful to group stocks into
//watchlists with minimum volume,
//and also by price ranges. Note, if a stock meets
//the criteria of a watchlist for even
//a single day, it is included in the watchlist.
// although I trade with 100k mininum vol, this uses
// 50k since 100k gives too few stocks prior to
1998
av50 = MA(V,5) > 50000;// use 100k for stocks
over $10
p1_10 = av50 AND OI >= 100 AND OI <
1000;
p10_up = av50 AND OI >= 1000;
Cum_p1_10 = LastValue(Cum(p1_10) ,True);
Cum_p10_up = LastValue(Cum(p10_up) ,True);
if(Cum_p1_10) CategoryAddSymbol( "",
CategoryWatchlist, 56
) ;//US 1-10
if(Cum_p10_up)CategoryAddSymbol( "",
categoryWatchlist, 58
) ;//US 10+
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