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Graham is perfectly correct.
Rick - you should read:
http://www.amibroker.com/guide/h_understandafl.html
Ref shifts entire array at once instead of accessing since array elements.
Best regards,
Tomasz Janeczko
amibroker.com
----- Original Message -----
From: "Graham" <gkavanagh@xxxxxxxxxxxxx>
To: <amibroker@xxxxxxxxxxxxxxx>
Sent: Friday, May 07, 2004 3:50 AM
Subject: RE: [amibroker] Improper code behavior
> Not certain what you are trying to do, but just looking at your code
> Posopen is 0 to start with, then you assign buy==1 when previous posopen is
> 0. ie buy=1 at second bar. You then tell it that posopen = buy which was
> last determined to be 1, but buy is held back by the original
> ref(posopen,-1) which was 0. Unless you have another condition to break the
> original buy statement it will always stay at buy1 as you kept posopen at 0.
> I think you would be better with a loop for this
> posOpen[0] = 0;
> for(i=1;i<BarCount;i++)
> { if(posopen[i-1]==0)
> { Buy[i]=1; posOpen[i]=1;}
> else
> { Buy[i]=0; posOpen[i]=0;}
> }
> Sell = 0;
> Filter=1;
> AddColumn(BarIndex(), "BarIndex");
> AddColumn(posOpen, "posOpen");
> AddColumn(Ref(posOpen, -1), "Ref(posOpen -1)");
> AddColumn(Sell, "sell");
> AddColumn(Buy, "buy");
>
> This will give alternating buy values of 0 and 1
>
> But there is another easier way of doing this if you are trying to determine
> if you have an open trade. I just used the buy and sell conditions of
> barindex as a means to test it.
>
> Buy = BarIndex()==BarCount-10;//buy conditions
> Sell = BarIndex()==BarCount-5;//sell conditions
> Buy = Flip(Buy,Sell);//holds buy=1 until sell signal
>
> Filter=1;
> AddColumn(Buy,"B",1);
> AddColumn(Sell,"S",1);
>
> Hope this is some help, as it was hard to determine what you were intending
> to do.
>
> Cheers,
> Graham
> http://e-wire.net.au/~eb_kavan/
>
> -----Original Message-----
> From: Rick Charon [mailto:rickcharon@xxxxxxxxx]
> Sent: Friday, May 07, 2004 9:15 AM
> To: amibroker@xxxxxxxxxxxxxxx
> Subject: [amibroker] Improper code behavior
>
> The following code doesn't work as expected. What am I missing?
> Thanks. (The buy flips once, then stays 1, even though Ref(posOpen, -
> 1) is 1.
>
> Filter = 1;
>
> posOpen[0] = 0;
>
> Buy = (Ref(posOpen, -1) == 0);
>
> posOpen = Buy;
>
> Sell = 0;
>
> AddColumn(BarIndex(), "BarIndex");
>
> AddColumn(posOpen, "posOpen");
>
> AddColumn(Ref(posOpen, -1), "Ref(posOpen -1)");
>
> AddColumn(Sell, "sell");
>
> AddColumn(Buy, "buy");
>
>
>
>
>
>
>
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