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--- In equismetastock@xxxxxxxxxxxxxxx, "Roy Larsen" <rlarsen@xxxx>
wrote:
> Scoubidoo
>
> > I'd like to trace a line between 2 tops.
> >
> > Those tops are from "high -20 days before" to " high-8 days
before".
> >
> > I only know a formula to trace a line until yesterday's high. But
i'd
> > like to stop the line, many days before, yesterday's high.
> >
> > How should I construct the formula ?
> >
> > Regards,
> >
> > Scoubidoo.
>
> Calculate how many bars from the required point (where the signal
is to be
> truncated) to the right side of the chart. This value is stored as a
> variable using LastValue() so that it can be used as a constant in
a Ref()
> function. Then use Ref() to move the line the required number of
bars to the
> right (negative Ref()), then move it the same number of bars to the
left
> (positive Ref()).
>
> Line:=Ref(Ref(Line,-BlankPeriods),BlankPeriods); {blank right side
of line}
>
> You can easily blank the left side of a line or signal (SignalA) by
using
> the ValueWhen() function. First you need to create another signal
(SignalB)
> that goes true where you want the line or signal to start.
>
> ValueWhen(1,{binary}SignalB,{value}SignalA)
>
> There are many variations to this, depending on your need.
>
> Roy
Roy & Scoub,
Starting playing around with several of the formulas that Roy has
posted. What I have initially come up with is a horizontal view of
the high 20 bars ago that is constant for the next 12 bars. Meaning
that the display extends from 20 bars ago to 8 bars ago and is
constant.
Since the original question was for a line from one high to the next
I am assuming it would be an declining trendline. To do this we
incorporate the slope and subtract its value from the line each day
forward. This is where I'm stumped. Any suggestions?
{BarBack View}
len:=Input("Periods for Ref High",1,100,20)-1;
Signal:=Ref(H,-len);
Barbk:=Input("Barsback High",1,100,8)-1;
Signal2:=Ref(H,-Barbk);
Slope:=(Signal-Signal2)/(len-Barbk);
Periods:=len; {periods to display last value}
LastBar:=Cum(1)=LastValue(Cum(1)-(Periods));
bacdis:=ValueWhen(1,LastBar,LastValue(Signal));
{blank right side of line}
Line:=Ref(Ref(bacdis,-Barbk),Barbk);
line{end}
Preston
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