[amibroker] Re: TD Lines

["johsun" <johanskatt@xxxxxxxx>]

Hi,

Here's my take on it.
 Problem with LineArray function is that it only takes numbers not 
arrays thus cannot be backtested (at least I don't thick it can). 
Input has to be LastValue or SelectedValue.

The code:
 
Plot(C,"",colorGreen,styleBar);

 pivotlow = Ref(L,-1)>L AND L<Ref(L,1);
 y0=SelectedValue(ValueWhen(pivotlow,L,2));
 y1=SelectedValue(ValueWhen(pivotlow,L,1));
 x0=SelectedValue(ValueWhen(pivotlow,Cum(1)-1,2));
 x1=SelectedValue(ValueWhen(pivotlow,Cum(1)-1,1));
 Cond=y1>y0;
 Line=LineArray(x0,y0,x1,y1,1);
 Plot(IIf(Cond,Line,Null),"",colorBlue,styleLine|
 styleThick|styleNoRescale|styleNoLabel);
 PlotShapes((Cum(1)-1==x0 OR Cum(1)-1==x1)
 *shapeSmallCircle,colorBlue,0,L); 
 PlotShapes((cond AND Cross(Cum(C<Line),0) AND Cum(1)-1>x1)
 *shapeDownArrow,colorRed,0,H);
 

Title="TD Demand Line";
GraphXSpace=4;

Johan




--- In amibroker@xxxxxxxxxxxxxxx, "Martin M" <marmal@xxxx> wrote:
> Hi, 
> 
> My first post, let's see if this works...
> 
> In his book The New Science of Technical Analysis Tom Demark 
describes objective and automatic ways to draw trendlines. For 
example: a TD demand line can be drawn connecting the two most 
recent troughs conforming to the following criteria:
> Yesterday's low is higher than today's low
> Tomorrow's low is higher than today's low
> 
> So a trough has higher lows on both sides. The two most recent 
troughs are then connected with a trendline and the trendline is 
extended into the future. If at anytime the trendline is broken a 
short position can be initiated at the point of the line break. If a 
new trough is created the trendline is re-drawn between the lows of 
the two most recent troughs. Additionally, the demand line must have 
a positive slope so the most recent trough's low must be higher than 
the previous one.
> 
> Similarly, a TD supply line kan be drawn connceting the two most 
recent tops (a bar with lower highs on both sides) and a break of a 
supply line can work as a trigger for a long position or to cover a 
short or both. Likewise, the supply line must have a negative slope.
> 
> I have seen succesful trading systems only based on TD Lines, but 
I am not good enough to program it into amibroker. So I was 
wondering if someone can help?
> It doesn't look too difficult, though. The troughs and tops 
must "only" be defined and connected with trendlines.
> 
> Any help would be very appreciated,
> Martin from Sweden



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