----- Original Message -----
Sent: Sunday, August 14,
2005 11:39 PM
Subject: RE: [amibroker]
Simple code stumper
Bill,
I don’t think that will work.
I tried something similar. Try this:
/*
** Filter by
Master List in AA Window
*/
//Remove current
symbol from target Watchlist.
//This ensures
that <TargetWatchlist> is always clean.
CategoryRemoveSymbol("",
categoryWatchlist, 1);
CategoryRemoveSymbol("",
categoryWatchlist, 2);
CategoryRemoveSymbol("",
categoryWatchlist, 3);
CategoryRemoveSymbol("",
categoryWatchlist, 4);
CategoryRemoveSymbol("",
categoryWatchlist, 5);
CategoryRemoveSymbol("",
categoryWatchlist, 6);
CategoryRemoveSymbol("",
categoryWatchlist, 7);
CategoryRemoveSymbol("",
categoryWatchlist, 8);
Ensure that the AA filtering is such that
your scan will include all symbols that could possibly be in any of your target
Watchlists. What happens is that, as each symbol is scanned, it is
removed from each of the target Watchlists.
This should run pretty fast. It
turns out that retrieving symbols is the slow part. Once a symbol is
retrieved and current, it will process pretty fast. You should see little
difference in removing a symbol from one Watchlist or eight Watchlists.
Regards,
Dan.
From: amibroker@xxxxxxxxxxxxxxx [mailto:amibroker@xxxxxxxxxxxxxxx] On Behalf Of wavemechanic
Sent: Sunday, August 14, 2005 7:54
PM
To: AmiBroker, User
Subject: Re: [amibroker] Simple
code stumper
Thanks. I believe I see what you are doing and
may have to go that route (kicking and screaming!).
What I am doing (and would like to continue doing) is
simply using the settings in AA to define a group that acts as the filter for
the ALL section. My results are automatically sent to 8 watchlists and
the CategoryAddSymbol() used to do this writes to the watchlists, but it does
it in append mode.
I have used the following code that is similar to
yours (I think) at the beginning of the program to cleanout the watchlist
before writing the symbol results. Unfortunately it does not work right
and I don't know why. It properly deletes old symbols but then does
not allow results (except one) to be written to the watchlist.
All that is needed is a switch
for CategoryAddSymbol() that permits overwriting rather than
appending. Hopefully, this is being considered for a future
release. As a friend from Ukraine says "Why simple if
complex will work just as well." ;-)
==========================
{
list = CategoryGetSymbols(categoryWatchlist, i);
for(j = 0;
(symbol = StrExtract(list,
j)) != "";
j++)
{
CategoryRemoveSymbol(symbol, categoryWatchlist,
i);
}
}
----- Original Message -----
Sent: Sunday, August 14,
2005 7:55 PM
Subject: RE: [amibroker]
Simple code stumper
Bill,
I think I had the same issue a few days
ago. Tomasz suggested adding “CategoryRemoveSymbol()” to my
code, but it is the flow of code that makes it work…
You use two source Watchlists. The first
is a “Master” list of all the symbols you would trade. (In my
case, I call this “Tradable Symbols”.) The second is one of
several “Source” Watchlists.
You always use the “Master”
Watchlist as the Exploration filter. Because you are always running
through your Master, all symbols will be removed from the target Watchlist just
prior to processing that symbol.
Your “Source” Watchlist is
used by the “InWatchList” function. If
“InWatchList” is True, then process the symbol. For example:
/*
** Filter by
Master List in AA Window
*/
//Remove current
symbol from target Watchlist.
//This ensures
that <TargetWatchlists> is always clean.
CategoryRemoveSymbol("",
categoryWatchlist,
<TargetWatchlist>);
//Use InWatchlist
to check for symbol in Source List
ValidSymbol = InWatchList
("",
categoryWatchlist,
<TargetWatchlist>);
If (ValidSymbol)
{
// Your processing code here
}
I think it would be a more elegant
solution to be able to clean out the target Watchlist, but this works
well. I hope it works for you.
Regards,
Dan.
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