[amibroker] Self adjusting "percentage" in advanced trendlines AFL

["kevinkee20" <kevinkee20@xxxxxxxxx>]

Hi,
I have a seemingly simple problem that unfortunately has bugged me for quite sometime.

I am trying to make a simple modification of the advanced trendline AFL (http://www.amibroker.com/library/detail.php?id=926&hilite=LineArray) so that it can adjust the "percentage" by itself.

So, instead of the original :
Percentage = Param("Percentage", 0.08, 0.01, 100. ,0.01);

I try to change it to:
Percentage = IIf(ADX(14)>20, 0.4, 0.7);

Unfortunately this doesn't work.  I get error when it tries to calculate x0, x1, y0, y1 (please see below).  Would any kind soul be able to tell me where the mistake is ?




Percentage = IIf(ADX(14)>20, 0.03, 0.08);
Lines = Param("Lines?", 1, 1, BarCount-2);
...[snip]
Plot(Main, "", IIf(C>O,colorGreen, colorRed), styleBar);
if(DrawAllLines)
for(i = 2; i<=Lines+1; i++)
{
if(DrawS!="Off")
{
x0 = GetXSupport(Support1, Percentage, i);
x1 = GetXSupport(Support2, Percentage, i-1);
y0 = GetYSupport(Support1, Percentage, i);
y1 = GetYSupport(Support2, Percentage, i-1);
x = LineArray(x0, y0, x1, y1, 1);
if(!Method)
Con = (IsTD_Demand(x0) AND IsTD_Demand(x1));
if(AllOrUpS) ConS = y0 < y1;
if(Con AND ConS)
Plot(x, "TD1", colorLightBlue, styleLine|styleThick);
xa = Study("xa", GetChartID());
}
...[snip]




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