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Bill,
You're comments appear to be off the mark. You already know that:
1. Buy is a special array declared by AmiBroker. So it is always an
array.
2. Tomasz advises "If you're having trouble coding AFL I
suggest you generate the arrays in the example in Excel for
yourself." http://www.amibroker.com/guide/h_understandafl.html
Following Ton's thread, I believe that he is saying that given:
Buy = 0,1,0,0,...
Sell= 0,0,0,1,...
In accordance with the User's Guide, he expects his IIF statement to
perform the following logic for his InLongPos array:
InLongPos[0] is null due to Ref(InLongPos, -1) being undefined.
InLongPos[1] is 1000 due to Buy[1] being 1.
InLongPos[2] is 1000 due to Ref(InLongPos, -1) being 1000 as just
calculated above.
InLongPos[3] is 0 due to Sell being 1.
...
Ton, is this what you are trying to express?
Perhaps the reason you are not seeing the expected results is because
the new values for InLongPos are being calculated in a temporary
array, then reassigned to the old InLongPos variable as follows (this
is just speculation, I haven't tried it):
InLongPos = 0,0,0,0 // After your first initialization to zero.
Temp[0] is null due to Ref(InLongPos, -1) being undefined.
Temp[1] is 1000 due to Buy[1] being 1.
Temp[2] is 0 due to Ref(InLongPos, -1) being 0.
Temp[3] is 0 due to Sell being 1.
InLongPos = Temp;
Would that explain what you are seeing?
Mike
--- In amibroker@xxxxxxxxxxxxxxx, "wavemechanic" <timesarrow@xxx>
wrote:
>
> So what if that's what you did with Excel. I don't know how
Excel "thinks" but it makes no difference because all that you have
to worry about is AFL. I assume that Buy (and consequently
inLongPos) is an array that was generated by a function that returns
an array (e.g., Cross(), MA(), etc.) in which case no matter what you
do you will have to deal with that fact. If it is not an array why
did you use Ref() which operates on arrays? Forget about what you
did in Excel and ask yourself if you did or did not generate Buy with
a function that returns an array? If you conclude that Buy is an
array then deal with it as such because nothing else will work,
including
>
> Bill
> ----- Original Message -----
> From: Ton Sieverding
> To: amibroker@xxxxxxxxxxxxxxx
> Sent: Friday, March 28, 2008 11:45 AM
> Subject: Re: [amibroker] Re: Something is different. But what ?
>
>
> Bill that's what I have done in Excel. And Ref(-1) show me the
previous cell. So if the
> previous cell shows 1.000 then the actual cell should also be
1.000 if there is no Sell. Please look what the statement says :
>
> 1. If Buy let the actual cell be 1.000
> 2. If Sell let the actual cell be 0.
> 3. Otherwise Cell(-1) = Cell(0) ...
>
> Regards, Ton.
>
> ----- Original Message -----
> From: wavemechanic
> To: amibroker@xxxxxxxxxxxxxxx
> Sent: Friday, March 28, 2008 2:57 PM
> Subject: Re: [amibroker] Re: Something is different. But what ?
>
>
>
> To understand "why not" take a look at the array discussion in
the Users Guide and think about what the inlongpos array looks like
at each bar and what ref(..., -1) is looking at.
>
> Bill
> ----- Original Message -----
> From: Ton Sieverding
> To: amibroker@xxxxxxxxxxxxxxx
> Sent: Friday, March 28, 2008 5:52 AM
> Subject: Re: [amibroker] Re: Something is different. But
what ?
>
>
> Mike/Bill thanks for the answers. Mike I am already using
Flip for LongPos and ShortPos. This works fine for me ( LongPos = Flip
(Buy,Sell) and ShortPos=Flip(Short,Cover) ). So that's not my
problem. My problem is that I still do not see the difference between
the two statements I have given and would like to know why there is a
difference. Bill in the first statement your should get same result
as with the For Loop. So LongPos will become '1000' as soon as we
have a Buy and will switch to '0' again with a 'Sell'. Assume T-1 had
a Buy then LongPos(T-1) = 1000. Therefore LongPos(T) will be set
to '1000' also. But you're right. This is not what is happening. And
I still do not understand why not ...
>
> Regards, Ton.
>
> ----- Original Message -----
> From: Mike
> To: amibroker@xxxxxxxxxxxxxxx
> Sent: Friday, March 28, 2008 12:33 AM
> Subject: [amibroker] Re: Something is different. But what ?
>
>
> Sorry,
>
> That should probably read Flip(ExRem(Buy, Sell), Sell) *
1000;
> And maybe not much easier after all ;)
>
> Mike
>
> --- In amibroker@xxxxxxxxxxxxxxx, "Mike" <sfclimbers@>
wrote:
> >
> > You could probably leverage the Flip function to make
this easier
> on
> > yourself.
> >
> > e.g.
> >
> > Buy = ...
> > Sell = ...
> > InLongPos = Flip(ExRem(Buy, Sell)) * 1000;
> >
> > Mike
> >
> > --- In amibroker@xxxxxxxxxxxxxxx, "wavemechanic"
<timesarrow@>
> > wrote:
> > >
> > > The iif() does not give the same result because ref
(inlongpos, -
> 1)
> > == 0 except when the previous bar is a buy. You can see
exactly
> what
> > is happening graphically with
> > >
> > > buy =
> > > sell =
> > > inlongpos = iif(...
> > > plot(c, "", iif(buy, colorred, iif(sell, coloryellow,
> > colorpalegreen)), stylebar);
> > > title = "inlongpos = " + inlongpos + " ref
(inlongpos..." + ref
> > (inlongpos...) + " buy = " + buy + " sell =" + sell
> > >
> > > If you want the iif() approach to hold either a buy or
sell value
> > for each bar additional code is needed to create this
condition.
> > >
> > > Bill
> > >
> > >
> > > ----- Original Message -----
> > > From: Ton Sieverding
> > > To: amibroker@xxxxxxxxxxxxxxx
> > > Sent: Thursday, March 27, 2008 8:10 AM
> > > Subject: Re: [amibroker] Something is different. But
what ?
> > >
> > >
> > > Sure. This of course if part of an AFL with Buy and
Sell
> defined.
> > Also an init for InLongPos
> > > being set to zero as a starter. Again the ForLoop works
fine. I
> > checked that with following statement : AddColumn
> > (InLongPos,"Long",1);
> > > My problem is that I do not understand why the first
statement
> > does not give me the correct answer where the second
does ...
> > >
> > > Regards, Ton.
> > >
> > > ----- Original Message -----
> > > From: wavemechanic
> > > To: amibroker@xxxxxxxxxxxxxxx
> > > Sent: Thursday, March 27, 2008 12:55 PM
> > > Subject: Re: [amibroker] Something is different. But
what ?
> > >
> > >
> > >
> > > Is there more to the code? Are you getting a
> > syntax/initialization error? How are you handling the
case when i
> ==
> > 1?
> > >
> > > Bill
> > >
> > > ----- Original Message -----
> > > From: "amsiev" <ton.sieverding@>
> > > To: <amibroker@xxxxxxxxxxxxxxx>
> > > Sent: Thursday, March 27, 2008 7:01 AM
> > > Subject: [amibroker] Something is different. But what ?
> > >
> > >
> > > > Why is following AFL statement :
> > > >
> > > > InLongPos = IIf(Buy==1,1000,IIf(Sell==1,0,Ref
(InLongPos,-
> 1)));
> > > >
> > > > giving me a different result as following ForLoop :
> > > >
> > > > for ( i=1; i<BarCount; i++ )
> > > > {
> > > > if (Buy[i]==1)
> > > > InLongPos[i] = 1000;
> > > > else
> > > > {
> > > > if (Sell[i]==1)
> > > > InLongPos[i] = 0;
> > > > else
> > > > InLongPos[i] = InLongPos[i-1];
> > > > }
> > > > }
> > > >
> > > > The result I am getting from the ForLoop is correct.
The
> first
> > > > statement gives me a wrong answer. I want to get 1000
in
> > InLongPos
> > > > after Buy and before Sell ... When testing the
statement in
> > Excel
> > > > it works fine with : =IF(A6=1;1000;IF(B6=1;0;C5)) ...
> > > >
> > > > What's wrong ?
> > > >
> > > >
> > > > ------------------------------------
> > > >
> > > > Please note that this group is for discussion between
users
> > only.
> > > >
> > > > To get support from AmiBroker please send an e-mail
> directly
> > to
> > > > SUPPORT {at} amibroker.com
> > > >
> > > > For NEW RELEASE ANNOUNCEMENTS and other news always
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> > DEVLOG:
> > > > http://www.amibroker.com/devlog/
> > > >
> > > > For other support material please check also:
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> > > > Yahoo! Groups Links
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > --
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> > > > Version: 7.5.519 / Virus Database: 269.22.0/1344 -
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> > Date: 3/26/2008 8:52 AM
> > > >
> > > >
> > >
> > >
> > >
> > >
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> Date:
> > 3/26/2008 8:52 AM
> > >
> >
>
>
>
>
>
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>
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> Checked by AVG.
> Version: 7.5.519 / Virus Database: 269.22.0/1344 - Release
Date: 3/26/2008 8:52 AM
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3/26/2008 8:52 AM
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