----- 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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