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Dimitris,
Yes, you are right about AddToComposite to calculate running number
of stocks based on bars. The AB.Stocks().Count is not representative
of that. It's just total number of stocks in the DB, independent of
validity of their individual bars. So the code itself is correct, but
not meant for what you're thinking it was for...
The only way I've ever had to use it is generally to loop over Stock
objects to delete 'em or programmatically move 'em to certain
watchlists, groups, etc.
Anytime you want to use the count over bars, etc., then what you say
is the right way to do it...
Jitu
--- In amibroker@xxxxxxxxxxxxxxx, "DIMITRIS TSOKAKIS" <TSOKAKIS@xxxx>
wrote:
> There is one safe way to count stocks.
> Scan all quotations with
> AddToComposite(1,"~count","V");
> Buy=0;
> Plot(Foreign("~count","V"),"",4,8);
> Your mycount plot from
> EnableScript("JScript");
> oAB = CreateStaticObject("Broker.Application");
> // NOTE FOLLOWING TWO LINES
> oStocks = oAB.Stocks();
> dummyResults = oStocks.DummyFunction();
> myVersion = oAB.Version();
> myCount = 0;
> <%
> ab = new ActiveXObject( "Broker.Application" );
> AFL("myCount") = ab.Stocks().Count;
> %>
> Plot(mycount,"",1,1);
> is a flat line equal to the max number of stocks.
> The problem begins when you want to use this mycount for various
> averages, it will be wrong for these bars with less stocks [for any
> reason].
> Of course, in an absolutely aligned database it will be by
> coincidence correct and you will not have the opportunity to see
the
> trap.
> Unfortunately I have no idea of jscript and can not see what is
wrong
> in your code.
> Note also that the same mistake will come whan you use
> list = CategoryGetSymbols( categoryWatchlist, 63 );
> pop=0;
> for( i = 0; ( sym = StrExtract( list, i ) ) != ""; i++ )
> {
> pop=POP+1;
> }
> Plot(pop,"",5,2);
> to plot the population pop of a WL63. The result will be a flat
line,
> which is not correct when you have missing data, shorter or longer
> histories.
> Dimitris Tsokakis
>
> --- In amibroker@xxxxxxxxxxxxxxx, "jtelang" <jtelang@xxxx> wrote:
> > Dimitris,
> >
> > Yes, I see the count as the one returned by Stocks().Count method
> in
> > the AB ActiveX object. I verified it by running similar code
> outside
> > AA, from command line. The actual count I get in my case is
34,622
> > (with QP3). At the same time, if I run an explore against "All
> > Stocks/Last 1 bar", I get 26,819 entries in the result. That
means
> > that around 8K symbols without any data (either on that last bar
or
> > completely empty, I don't know) exist in the DB.
> >
> > What count do you get when you run it?
> >
> > Jitu
> >
> > --- In amibroker@xxxxxxxxxxxxxxx, "DIMITRIS TSOKAKIS"
> <TSOKAKIS@xxxx>
> > wrote:
> > > Jitu,
> > > What is your mycount ?
> > > Because it does not count the database stocks.
> > > [Try to Plot(mycount,"",1,1); to see what I mean.]
> > > Dimitris Tsokakis
> > > > > -----Original Message-----
> > > > > From: jtelang [mailto:jtelang@x...]
> > > > > Sent: Wednesday December 31, 2003 12:14 AM
> > > > > To: amibroker@xxxxxxxxxxxxxxx
> > > > > Subject: [amibroker] Re: JScripts - some debugging help
needed
> > > > >
> > > > >
> > > > > William/Dingo,
> > > > >
> > > > > Following line is a suspect -
> > > > >
> > > > > > oStocks = oAB.Stocks();
> > > > >
> > > > > In AFL world, what are you expecting oStocks to be -- an
AFL
> > > array,
> > > > a
> > > > > constant, a string or a JScript array of objects? I could
be
> > > wrong,
> > > > > but I don't think you can treat such return values in pure
> AFL
> > > > world
> > > > > as if you were dealing with a JScript world. I'd think a
more
> > > > > appropriate way to do it would be as follows, which does
seem
> > to
> > > > > work -
> > > > >
> > > > > // ------------
> > > > > EnableScript("JScript");
> > > > > oAB = CreateStaticObject("Broker.Application");
> > > > >
> > > > > // NOTE FOLLOWING TWO LINES
> > > > > oStocks = oAB.Stocks();
> > > > > dummyResults = oStocks.DummyFunction();
> > > > >
> > > > > myVersion = oAB.Version();
> > > > > myCount = 0;
> > > > > <%
> > > > > ab = new ActiveXObject( "Broker.Application" );
> > > > > AFL("myCount") = ab.Stocks().Count;
> > > > > %>
> > > > > Filter=1;
> > > > > AddColumn(myCount, "Count");
> > > > > AddTextColumn(myVersion,"Version");
> > > > > // --------------
> > > > >
> > > > > Also, note the two lines where marked. It seems on return
> > values
> > > > like
> > > > > oStocks, AB doesn't complain if it can't find the called
> > method.
> > > > > Actually I think that's going too far. AB doesn't probably
> even
> > > > know
> > > > > what type it is unless it can convert the original return
> value
> > > > > (oStocks) into an array, a constant or a string. But that's
> > just
> > > a
> > > > > guess.
> > > > >
> > > > > Hope this helps.
> > > > >
> > > > > Jitu
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