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Thank you Graham and Tomasz,
The idea of the array shifting all at once explains my dificculty. In
general, does this mean that if there is an interdependency between 2
arrays, that is each relies on the other, you would have to use for-
loops to set their values properly? Tomasz, I did read the docs you
suggested. Any other pointers are greatly appreciated!
Rick
--- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <amibroker@xxxx>
wrote:
> 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@xxxx>
> 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@x...]
> > 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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