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Could it be it is like this:
"
// The last best-fit parabolic trendline, by D. Tsokakis, Sept2004
Plot(C,"C",1,64);
perc=3;//sensitivity calibration
x=BarIndex();xx=LastValue(x);
t1=LastValue(ValueWhen(PeakBars(H,perc)==0,x));
H1=LastValue(ValueWhen(PeakBars(H,perc)==0,H));
t11=LastValue(ValueWhen(TroughBars(L,perc)==0,x));
H11=LastValue(ValueWhen(TroughBars(L,perc)==0,L));
g=t1>t11;
shape=IIf(g,shapeDownArrow*(x==t1),shapeUpArrow*(x==t11));
Color=IIf(g,colorRed,colorBrightGreen);
PlotShapes(shape,color);
t=IIf(g,x-t1,x-t11);
diff1=IIf(g,H1*(xx-t1),H11*(xx-t11));
Lma=LastValue(MA(C,50));
f1=0;f2=IIf(Lma<100,1,0)+3*int(log10(Lma));
fa=0;fb=0;step=f2/100;
for(f=f1;f<f2;f=f+step)
{
parabolic=IIf(g,H1-f*t^2,H11+f*t^2);
S1=LastValue(Sum(abs(parabolic-H),xx-t1));
S11=LastValue(Sum(abs(parabolic-L),xx-t11));
diff=IIf(g,S1,S11);
if(diff<diff1)
{
diff1=diff;fa=f;
}
}
for(f=Max(fa-step,0);f<fa+step;f=f+0.01*step)
{
parabolic=IIf(g,H1-f*t^2,H11+f*t^2);
S1=LastValue(Sum(abs(parabolic-H),xx-t1));
S11=LastValue(Sum(abs(parabolic-L),xx-t11));
diff=IIf(g,S1,S11);
if(diff<diff1)
{
diff1=diff;fb=f;
}
}
p=IIf(g,H1-fb*t^2,H11+fb*t^2);
p0=IIf(g,H1-f2*t^2,H11+f2*t^2);
p1=IIf(g,H1,H11);
//p0=IIf(p0>LLV(L,200), p0, p1=IIf(g,H1,H11));
Plot(IIf(x>=Max(t1,t11),p,-1e10),"",color,8);
//Plot(IIf(x>=Max(t1,t11),p0,-1e10),"",color+1,1);
Plot(IIf(x>=Max(t1,t11),p1,-1e10),"",color+1,1);
Title=Name()+", "+WriteIf(t1>t11,"f_desc","f_asc")+"="+WriteVal(fb,1.4);//+"[f2="+WriteVal(f2)+",step="+WriteVal(step);
GraphXSpace=3;
"
PS:
"The Strange Plot"
I have to tyake one line of your code out "
Plot(IIf(x>=Max(t1,t11),p0,-1e10),"",color+1,1);" because it shows an heavy upwards parabol while price remains in a flat line because the scale too different. (It thows an interesting question: How would you normalise two graphs of different scale for example MACD and TSV so that we can monitor theirs behaviour on one chart only?)
Could you explain what that line plots? An expected trend? In that case many stock trade sideways but trendline shown strongly up.
Thanks for the formula, and thank for your time to explain or correct "the strange plot"
Khai Nguyen <ntk98_2000@xxxxxxxxxxx> wrote:
DT,
The formula on Elitetrader contains errors. Please correct them.
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