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No, I don't think it's chicken/egg problem.
Initially it's a very simple task: I need PREVIOUS values of Buy/Sell
to calculate CURRENT tradeProfit, then I need PREVIOUS value of
tradeProfit to calculate current value of Buy. It seemed so easy!
But it turned out that AFL doesn't allow it. So I am looking for
workaround :(
Thanks,
Mike
--- In amibroker@xxxx, "bluesinvestor" <investor@xxxx> wrote:
> This is kind of the chicken and the egg problem isn't it?
>
> You will never get a BUY if tradeProfit is never initialized (thus
it will
> never be LESS THAN zero).
>
> Or am I missing something?
>
> -----Original Message-----
> From: mik954 [mailto:mik-u@x...]
> Sent: Tuesday, April 23, 2002 11:30 AM
> To: amibroker@xxxx
> Subject: [amibroker] Re: Declare variable for future use: Left/Right
> side of the formula
>
>
> Hi, Mike,
>
> Thank you for the idea. Here is my usage:
>
> // var tradeProfit; // declare variable for future use
> Buy = longEntry and ValueWhen(Sell, tradeProfit) < 0;
> Sell = LongExit;
> tradeProfit = ValueWhen(Sell, SellPrice) - ValueWhen(Buy, BuyPrice);
>
> May be you idea about setting to Close will work. When I tried to
> initialize tradeProfit array with 0, it didn't return correct value
> in ValueWhen() function: allways 0.
>
> Thanks,
> Mike
>
>
> --- In amibroker@xxxx, Mike Pham <mmqp@xxxx> wrote:
> > without much knowing of your usages; I would think
> > you could always create a dummy array and use it on
> > the right side of the formula.
> >
> > dummy = Close; // this is to create the dummy array
> > and initialize them with close datas.
> >
> > ABformula = dummy;
> >
> > regards.
> > --- mik954 <mik-u@xxxx> wrote:
> > > Tomasz,
> > >
> > > Thank you for the links describing AFL arrays.
> > >
> > > But I still don't know how I can benefit from
> > > AMA/AMA2 functions to
> > > fix my problem.
> > >
> > > The problem is how to obtain a value from an array
> > > using ValueWhen()
> > > function (on the right side of the formula) before
> > > setting/defining
> > > this array on the left side of the formala.
> > >
> > > In Excel I don't need to declare any rows/columns:
> > > they are all
> > > predefined. Therefore I can use any new row/column
> > > on the left and
> > > right side of the formula at any time.
> > >
> > > As I understand in AFL I CANNOT use an array on the
> > > right side of the
> > > formula before using it on the left side.. That's my
> > > PROBLEM.
> > >
> > > A simle fix would be using some kind of declaration
> > > (var for example,
> > > like in VB/JS Script) to allow using of array on the
> > > right side of
> > > the formula.
> > >
> > > Thanks,
> > > Mike
> > >
> > >
> > >
> > >
> > >
> > > --- In amibroker@xxxx, "Tomasz Janeczko"
> > > <amibroker@xxxx> wrote:
> > > > Mike,
> > > >
> > > > There are numerous possibilities to reference
> > > previous value of the
> > > indicator or any array.
> > > > Please check out
> > > http://www.amibroker.net/boards/viewtopic.php?t=81
> > > for the details.
> > > >
> > > > Best regards,
> > > > Tomasz Janeczko
> > > > amibroker.com
> > > > ----- Original Message -----
> > > > From: "mik954" <mik-u@xxxx>
> > > > To: <amibroker@xxxx>
> > > > Sent: Tuesday, April 23, 2002 2:15 AM
> > > > Subject: [amibroker] Re: Declare variable for
> > > future use: No way in
> > > AFL?
> > > >
> > > >
> > > > > Tomasz,
> > > > >
> > > > > You mean that I cannot use REF() function to get
> > > a previous
> > > element
> > > > > of an ARRAY mentioned later in the code?
> > > > >
> > > > > So in AFL there is no way to use a previous
> > > value of a variable
> > > to
> > > > > define its new value? What a disappointment. Is
> > > there any
> > > workaround?
> > > > >
> > > > > Thanks,
> > > > > Mike
> > > > >
> > > > >
> > > > > --- In amibroker@xxxx, "Tomasz Janeczko"
> > > <amibroker@xxxx> wrote:
> > > > > > Mike,
> > > > > >
> > > > > > No, AFL operates on entire arrays and it uses
> > > only single-pass
> > > to
> > > > > process all bars.
> > > > > > So if you assign a value later in your code it
> > > will have no
> > > effect
> > > > > on any lines that appeared
> > > > > > before.
> > > > > >
> > > > > > Best regards,
> > > > > > Tomasz Janeczko
> > > > > > amibroker.com
> > > > > > ----- Original Message -----
> > > > > > From: "mik954" <mik-u@xxxx>
> > > > > > To: <amibroker@xxxx>
> > > > > > Sent: Monday, April 22, 2002 6:13 PM
> > > > > > Subject: [amibroker] Declare variable for
> > > future use (was TJ:
> > > > > Actual trade profit vs. Theoretical)
> > > > > >
> > > > > >
> > > > > > > Hi, all!
> > > > > > >
> > > > > > > Well, so far no any response on my initial
> > > post (even on
> > > direct e-
> > > > > > > mail to support@xxxx). It's weird. Maybe my
> > > question wasn't
> > > > > > > clear, or Tomasz was too busy.
> > > > > > >
> > > > > > > OK, let me ask in a different way. Is there
> > > any way in AFL to
> > > > > declare
> > > > > > > variable/array and use its previos value
> > > before setting
> > > current
> > > > > one?
> > > > > > >
> > > > > > > I mean:
> > > > > > >
> > > > > > > // var tradeProfit; // declare variable for
> > > future use
> > > > > > >
> > > > > > > Buy = longEntry and ValueWhen(Sell,
> > > tradeProfit) < 0;
> > > > > > > Sell = LongExit;
> > > > > > >
> > > > > > > tradeProfit = ValueWhen(Sell, SellPrice) -
> > > ValueWhen(Buy,
> > > > > BuyPrice);
> > > > > > >
> > > > > > >
> > > > > > > Any suggestions are welcome.
> > > > > > >
> > > > > > > Thanks,
> > > > > > > Mike
> > > > > > >
> > > > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > Your use of Yahoo! Groups is subject to
> > > http://docs.yahoo.com/info/terms/
> > > > >
> > > > >
> > > > >
> > >
> > >
> >
> >
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