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Re: Declare variable for future use: Left/Right side of the formula



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Hi,

as you may see your code 

> Ep=ValueWhen(Buy,C);
> Ex=ValueWhen(Sell,C);
> profit=(Ex/Ep)-1;
> Buy2=Buy1 AND profit<0;
> Graph0=Buy2;

doesn't use "profit" variable for Buy signal computation. Buy2 != Buy.
Thanks,
Mike


--- In amibroker@xxxx, "nenapacwanfr" <nenapacwanfr@xxxx> wrote:
> hi,
> 
> if I understand you want a first system with buy&sell rules, and 
> valid a buy ( a reentry )only if the trade is losing??????
> 
> Buy1=Cross(RSI(3),50); 
> Buy = Buy1;
> Buy=ExRemSpan( Buy, 12 );
> Sell=Ref(Buy,-12);
> 
> BuyPrice=C;
> SellPrice=C;
> Ep=ValueWhen(Buy,C);
> Ex=ValueWhen(Sell,C);
> profit=(Ex/Ep)-1;
> Buy2=Buy1 AND profit<0;
> Graph0=Buy2;
> 
> 
> 
> > 
> > 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/ 
> > > > 
> > > > 
> > > >