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We use various functions looking into the future in pattern
recognition formulas.
Trendlines, for example, are usually based on Peak/Trough [or their
derivatives] functions.
It is important to know EXACTLY what you do.
When you use, for example PeakBars(H,5)==0; you should perfectly
understand that a peak will be recognised as a peak as soon as the H
will be lower than the 0.95*recentHigh.
If you have some pattern recognition problem, ask here, some solution
may already exist. It is better than experimenting with negative
substitutions out of any logical control.
I have no idea, for example, what is hhv(H,-bars), but, what is the
request for such an option ? If you ask your question, a solution may
be found in many different ways.
DT
--- In amibroker@xxxxxxxxxxxxxxx, "IVA GmbH" <funnybiz@xxxx> wrote:
> Dimitris,
>
> thanks for this.
>
> I tried to use the high/low functions from AFL langunage with
negative
> values and picked hhv as an example.
>
> But using hhv with negative values (hhv(high,-1) etc.) gives weird
results.
>
> Do you have an idea what THAT means?
>
> I may need to reference future quotes for pattern recognition, NOT
for
> trading!
>
> Thanks again
>
> Markus
> ----- Original Message -----
> From: "DIMITRIS TSOKAKIS" <TSOKAKIS@xxxx>
> To: <amibroker@xxxxxxxxxxxxxxx>
> Sent: Friday, May 23, 2003 7:55 PM
> Subject: [amibroker] Re: Referencing future?
>
>
> Markus,
> valuewhen and exrem may refer to the future in many ways.
> a. valuewhen(EXPRESSION, ARRAY, n = 1)
> From the description we read:
> "Note: this function allows also 0 and negative values for n - this
> enables referencing future."
> The function may also refer to the future when the EXPRESSION does.
> Example valuewhen(Peakbars(H,5)==0,macd(),1)
> b. exrem( ARRAY1, ARRAY2 ) may also refer to the future because of
> ARRAY1 or ARRAY2.
> Example:
> In exrem(zig(H,5)>C,zig(L,5)<C), the excessive signals will be
> removed, but both zig conditions refer to the future.
> In complicated expressions it is easy to loose the control and,
above
> all, you should avoid get any trading results as realistic [some
> times they are ...attractive, but...]
> Dimitris Tsokakis
> > --- In amibroker@xxxxxxxxxxxxxxx, "IVA GmbH" <funnybiz@xxxx>
wrote:
> > > Hello,
> > >
> > > as far as I know, many AFL commands such as Ref() are designed
to
> > look into the future if needed.
> > >
> > > Does anybody know if functions like Valuewhen, Exrem and all the
> > high/low functions(hhv,llv, highestbars, highestsincebars et.) can
> > also do that?
> > >
> > > I understand one shouldnŽt reference future quotes for TRADING.
> IŽd
> > maybe need it in exploration mode.
> > >
> > > Gracias!
> > >
> > > Markus
>
>
>
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