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Ahh, Dimitris, sometimes I think I am getting too old for all this :-(
I messed up on this one, hitting the send button too soon and not thinking
straight. Oh well, I stumble and learn ..
Thanks again for your patience,
Herman.
> -----Original Message-----
> From: dtsokakis [mailto:TSOKAKIS@x...]
> Sent: Monday, April 29, 2002 12:16 PM
> To: amibroker@xxxxxxxxxxxxxxx
> Subject: [amibroker] Re: Are your Composites accurate???
>
>
> Herman,
> I really donīt know how do you realise things.
> Well, -1^10 is equal to 1.
> [It acts like (-1)^10 because of priorities in operators**
> [try Plot(-1^10,"",1,1);]
> -1*10^10 is a huge negative number
> Another Amibroker expression is -1e10, also negative enough.
> Your formula was not correct, because it was excuding stocks with
> open==1 from counting.[see previous mails to you]
> DT
> **Operator precedence and the parentheses
> AFL supports parentheses in formulas.
>
> Parentheses can be used to control the operation precedence (the
> order in which the operators are calculated). AmiBroker always does
> operations within the innermost parentheses first. When parentheses
> are not used, the precedence is as follows (higher precedence listed
> first):
>
> No Symbol Meaning
> 1 ^ Exponentiation
> 2 - Negation - Unary minus
> 3 * Multiplication
> 4 / Division
> 5 + Addition
> 6 - Subtraction
> 7 < Less than
> 8 > Greater than
> 9 <= Less than or equal to
> 10 >= Greater than or equal to
> 11 == Equal to
> 12 != Not equal to
> 13 NOT Logical "Not"
> 14 AND Logical "And"
> 15 OR Logical "Or"
> 16 = Variable assignment operator
>
> The expression
>
> H + L / 2;
> (without parenthesis) would be calculated by AmiBroker as "L / 2"
> plus "H", since division has a higher precedence. This would result
> in a much different value than
>
> (H + L)/2;
>
> --- In amibroker@xxxx, "Herman van den Bergen" <psytek@xxxx> wrote:
> > > -----Original Message-----
> > > From: dtsokakis [mailto:TSOKAKIS@x...]
> > > Sent: Sunday, April 28, 2002 11:13 AM
> > > To: amibroker@xxxx
> > > Subject: [amibroker] Re: Are your Composites accurate???
> > >
> > >
> > > Herman,
> > > I just noticed that your EMPTY is -1^10, ie equal to 1.
> > > So, your equivalent formula is
> > > EMPTY = 1;
> >
> > Just realized that -1^10 is not equal to 1 but is -1 * 10^10
> >
> > perhaps my code was OK anyway?
> >
> > Take care,
> > Herman.
> >
> >
> >
> >
> > > AddToComposite(IIf(Open == 1,0,1),"~DataPresent","v",3);
> > > Do you have in the group of your gif some stocks with open==1 ?
> > > This would give some explanation.
> > > DT
> > > PS The huge negative symbol in AFL is -1e10
> > > --- In amibroker@xxxx, "dtsokakis" <TSOKAKIS@xxxx> wrote:
> > > > Of course I receive an identical result list with your
> > > > EMPTY = -1^10;
> > > > AddToComposite(IIf(Open == EMPTY,0,1),"~DataPresent","v",3);
> > > > Buy= 0;
> > > > f=Foreign("~datapresent","v");
> > > > Filter=f!=101;
> > > > AddColumn(f,"");
> > > > EXACTLY the same results.
> > > > To avoid any misuderstanding :your formula works, I just think
> > > > Amibroker does not use the open==EMPTY hypothesis, because if
> the
> > > > ADLAC is not present on 16/4/2002, there is no reference for
> ADLAC
> > > > this date.
> > > > My opinion is from experience, Tomasz knows how AddToComposite()
> > > > works.
> > > > DT
> > > > --- In amibroker@xxxx, "Dimitris Tsokakis" <TSOKAKIS@xxxx>
> wrote:
> > > > > I respectfully disagree. If you are not concerned about bar-
> by-
> > > bar
> > > > accuracy
> > > > > than you are correct. In that case the "1" method works fine.
> As
> > > > long as you
> > > > > know that this method will pick up holes of several days but
> that
> > > > it will
> > > > > not pick up single bar holes.
> > > > >
> > > > >
> > > > > Herman,
> > > > > Of course we speak for daily search, bar-by-bar.
> > > > > I have in my ^NDX 4 experimental holes on
> > > > > 6/1/2000 [1], 15/2/2000 [1] and 1/3/2000[2]
> > > > > plus the missing ADLAC after 15/4/2002.
> > > > > As you see from the exploration, the population
> > > > > is different from 101 exactly these dates.
> > > > > I do not understand the conditions of your graph.
> > > > > The
> > > > > AddToComposite(1,"~count","v");
> > > > > Buy=0;
> > > > > scans bar-by-bar every stock for each date.
> > > > > If the stock is present, it adds an 1 and moves to the next
> stock.
> > > > > If ADLAC is not present on 16/4/2002, then the sum will be 100
> > > > > for the certain date.
> > > > > It is impossible to have a 20% error, there should be another
> > > > > reason for your results.
> > > > > Dimitris Tsokakis
> > >
> > >
> > >
> > >
> > >
> > > Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/
> > >
> > >
>
>
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
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