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Tomasz,
Sorry to bother you with this stupid question. You are absolutly
right that "in ANY language you should not use a variable without
initializing it first." But in AFL we deal with not scalar variables,
but ARRAYS. So when I want to initialize array, in fact I want to
initialize a "pointer" to array, not ALL ACTUAL VALUES of array.
Right?
Here is my idea in English:
Buy signal will be accepted only if previous ACTUAL trade in the same
direction was a loss.
Here is the code which doesn't work:
Buy = 0;
Sell = 0;
tradeProfit = 0;
Buy = longEntry and ValueWhen(Sell, tradeProfit) < 0);
Sell = LongExit;
tradeProfit = ValueWhen(Sell, SellPrice) - ValueWhen(Buy, BuyPrice);
The problem is that ValueWhen(Sell, tradeProfit) always returns 0.
May be because "initialization" of tradeProfit resets all previous
values to 0.
I guest something like this might work:
var Sell;
var tradeProfit;
Buy = longEntry and ValueWhen(Sell, tradeProfit) < 0);
Sell = LongExit;
tradeProfit = ValueWhen(Sell, SellPrice) - ValueWhen(Buy, BuyPrice);
Thanks,
Mike
--- In amibroker@xxxx, "Tomasz Janeczko" <amibroker@xxxx> wrote:
> Mike,
>
> In fact in ANY language you should not use a variable without
initializing it first.
> But as to the problem - it would be better if you explain in plain
english
> what do you want to achieve, then it will be possible to write the
code.
>
> Best regards,
> Tomasz Janeczko
> amibroker.com
> ----- Original Message -----
> From: "mik954" <mik-u@xxxx>
> To: <amibroker@xxxx>
> Sent: Tuesday, April 23, 2002 3:50 PM
> Subject: [amibroker] Re: Declare variable for future use:
Left/Right side of the formula
>
>
> > 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/
> > > >
> > > >
> > > >
> >
> >
> >
> >
> >
> > Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
> >
> >
> >
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