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Mike,
I already posted this but you maybe overlooked this, so once again:
the code for your problem is:
Buy = ... entry rule...
Sell = .... exit rule...
TheoreticalProfit = ValueWhen( Sell, SellPrice ) - ValueWhen( Buy, BuyPrice, 2 )
Buy = Buy AND TheoreticalProfit < 0;
Another solution is to use VBScript as explained in AmiBroker User's guide: AmiBroker Formula Language:
AFL Scripting Host. In VBScript you can loop as you wish.
There is no workaround needed at all.
Best regards,
Tomasz Janeczko
amibroker.com
----- Original Message -----
From: "mik954" <mik-u@xxxx>
To: <amibroker@xxxxxxxxxxxxxxx>
Sent: Tuesday, April 23, 2002 11:17 PM
Subject: [amibroker] Re: Declare variable for future use: Looking for workaround
> 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
> > > > > > > >
> > > > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
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> > > > > >
> > > > > >
> > > > > >
> > > >
> > > >
> > >
> > >
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