For the record, I initiated the code
stated below (GBS). I must qualify though that Bob Johnson wrote the smart stuff
with the loop for me.
Regards,
Gordon Sutherland
-----Original Message-----
From: Stephane Carrasset
[mailto:nenapacwanfr@xxxxxxxxx]
Sent: Saturday, 5 March 2005 3:46
a.m.
To: amibroker@xxxxxxxxxxxxxxx
Subject: [amibroker] Re: Graham
& Bob Jagow "LineArray"
that's remember me that I have already seen a code
with many trend
line.
this code was written by ???
/* JOHN CLAYBURG BASED SUPPORT/RESISTANCE LINES
Coded by GBS May 2004
/* CATEGORY 3 SUPPORT BREAKOUT TRIGGER FOR SHORTS:
*/
/* PARAMETERS */
ColLSC = ParamColor("SU
Color",colorOrange);
ColLRC = ParamColor("RE
Color",colorBlue);
LL_3_6 = Ref(L,-6) > Ref(L,-3);
LL_3_5 = Ref(L,-5) > Ref(L,-3);
LL_3_4 = Ref(L,-4) > Ref(L,-3);
LL_3_2 = Ref(L,-2) > Ref(L,-3);
LL_3_1 = Ref(L,-1) > Ref(L,-3);
LL_3_0 = L > Ref(L,-3);
Cat3Sup = LL_3_6 AND LL_3_5 AND LL_3_4 AND LL_3_2
AND LL_3_1 AND
LL_3_0;
/* SUPPORT LINE ("SC") */
y0=ValueWhen(Cat3Sup,Ref(L,-3),2);
y1=ValueWhen(Cat3Sup,Ref(L,-3),1);
x0=ValueWhen(Cat3Sup,BarIndex(),2)-3;
x1=ValueWhen(Cat3Sup,BarIndex(),1)-3;
// looking into the future here, but it is
// only applied to historical plots to determine
// the length of the extension.
xsf=ValueWhen(Cat3Sup,BarIndex(),0)-3;
/* CATEGORY 3 RESISTANCE BREAKOUT TRIGGER FOR
LONGS: */
HH_3_6 = Ref(H,-6) < Ref(H,-3);
HH_3_5 = Ref(H,-5) < Ref(H,-3);
HH_3_4 = Ref(H,-4) < Ref(H,-3);
HH_3_2 = Ref(H,-2) < Ref(H,-3);
HH_3_1 = Ref(H,-1) < Ref(H,-3);
HH_3_0 = H < Ref(H,-3);
Cat3Res = HH_3_6 AND HH_3_5 AND HH_3_4 AND HH_3_2
AND HH_3_1 AND
HH_3_0;
y2=ValueWhen(Cat3Res,Ref(H,-3),2);
y3=ValueWhen(Cat3Res,Ref(H,-3),1);
x2=ValueWhen(Cat3Res,BarIndex(),2)-3;
x3=ValueWhen(Cat3Res,BarIndex(),1)-3;
// another look into the future.
xrf=ValueWhen(Cat3Res,BarIndex(),0)-3;
Plot(C,"C", colorBlack, styleCandle);
extendedSup=0;
extendedRes=0;
NullY0=IsNull(y0);
NullY2=IsNull(y2);
for ( i = BarCount -1 ; i > 7 ; i-- ) {
if ( !NullY0[i] ){ // only plot lines when
enough datapoints avail.
if ( x0[i] != x0[i-1] ) {
ms = (y1[i] -
y0[i])/(x1[i] - x0[i]); // simple slope of support
if ( NOT
extendedSup ) { // Haven't extended one yet
extendedSup = 1;
Line1 =
LineArray( x0[i], y0[i], x1[i] + 3, y1[i] + (3 *
ms),0,True);
Plot(Line1,"",ColLSC,styleLine);
Line2 =
LineArray( x1[i] + 3, y1[i] + (3 * ms), x1[i] + 4,y1
[i] + (4 * ms), 1,True);
Plot(Line2,"Cat3Sup",colorWhite,styleLine+styleNoRescale);
Sell=Cross(Line2,C);
PlotShapes(IIf
(Sell,shapeHollowDownArrow,shapeNone),colorRed,0,H,-10);
} else { // old
Cat3Sup lines, use 'look ahead' extensions
Line3 =
LineArray( x0[i], y0[i], x1[i] + 3, y1[i] + (3 *
ms),0,True);
Plot(Line3,"",colorPink,styleLine);
Line4 =
LineArray( x1[i] + 3, y1[i] + (3 * ms),
xsf[i] + 3, y1[i] + ms * (xsf[i] -
x1[i] + 3), 0,True);
Plot(Line4,"Cat3Sup",colorWhite,styleLine+styleNoRescale);
Sell=Cross(Line4,C);
PlotShapes(IIf
(Sell,shapeHollowDownArrow,shapeNone),colorRed,0,H,-10);
}
}
}
if ( !NullY2[i] ){ // only plot lines when
enough datapoints avail.
if ( x2[i] != x2[i-1] ) {
mr = (y3[i] -
y2[i])/(x3[i] - x2[i]); // simple slope of
resistance
if ( NOT
extendedRes ) { // Haven't extended one yet
extendedRes = 1;
Line5=
LineArray( x2[i], y2[i], x3[i] + 3, y3[i] + (3 *
mr),0,True);
Plot(Line5,"",ColLRC,styleLine);
Line6 =
LineArray( x3[i] + 3, y3[i] + (3 * mr), x3[i] + 4,y3
[i] + (4 * mr), 1,True);
Plot(Line6,"Cat3Sup",colorWhite,styleLine+styleNoRescale);
Buy=Cross(C,Line6);
PlotShapes(IIf
(Buy,shapeUpArrow,shapeNone),colorBrightGreen,0,L,-10);
} else { // old
Cat3Sup lines, use 'look ahead' extensions
Line7=
LineArray( x2[i], y2[i], x3[i] + 3, y3[i] + (3 *
mr),0,True);
Plot(Line7,"",colorBlue,styleLine);
Line8 =
LineArray( x3[i] + 3, y3[i] + (3 * mr),
xrf[i] + 3, y3[i] + mr * (xrf[i] -
x3[i] + 3), 0,True);
Plot(Line8,"Cat3Sup",colorWhite,styleLine+styleNoRescale);
Buy=Cross(C,Line8);
PlotShapes(IIf
(Buy,shapeUpArrow,shapeNone),colorBrightGreen,0,L,-10);
}
}
}
}
NumColumns = 0;
// EXPLORATION EXAMPLE:
Filter = Buy OR Sell;
AddTextColumn(FullName(),"Full
name",77,colorPlum, IIf(Close <
1.00,colorYellow,colorDefault ) );
result =
WriteIf(Buy,"Buy","Sell");
AddTextColumn(result,"Trade", formatChar,
IIf
(Buy,colorDarkGreen,colorRed ),
IIf(Sell,colorPink,colorLime));
AddColumn(Ref(Close,-1),"Y-Close",1.4,
IIf( ROC(Ref(C,-1),1)>=
0,colorDarkGreen, colorRed ),50 );
AddColumn(Open,"Open",1.4,IIf( ROC(Open,
1 ) >= 0, colorDarkGreen,
colorRed ) );
AddColumn(High,"High",1.4,IIf( ROC(High,
1 ) >= 0, colorDarkGreen,
colorRed ) );
AddColumn(Low,"Low",1.4,IIf( ROC(Low, 1
) >= 0, colorDarkGreen,
colorRed ) );
AddColumn( Close, "Close", 1.4, IIf(
ROC(C, 1 ) >= 0, colorDarkGreen,
colorRed ),50 );
AddColumn( ROC( Close, 1 ), "ROC(1)",
1.2, IIf( ROC(C, 1 ) >= 0,
colorDarkGreen, colorRed));
AddColumn( Volume, "Volume", 10.0, IIf(
ROC(V, 1 ) >= 0,
colorDarkGreen, colorRed ) );
AddColumn( y3, "TL Break", 10.4,
colorDarkBlue,37 );
AddColumn( ((Close-y3)/y3)*100, "TL Break
%", 10.2,
colorDarkBlue,37 );
AddColumn( y1, "TL Break", 10.4,
colorRed,40 );
AddColumn( ((Close-y1)/Close)*100, "TL Break
%", 10.2, colorRed,40 );
>
> Been folllowing your thread on Study &
LineArray. Seems related to
my
> Post "Help, Trend Line Break -
Explore/Backtest"..
>
> I ask this just so I know to stop wasting
time or not trying to
figure
> it out.
>
> ************************
> Can you use "LineArray" in an
Explore or Backtest to check for an
> indicator to "CROSS" the extended
"Lines" that should be drawn ????
> ************************
>
> I fear this is not possible, from the
following statement Bob
posted.
> My Explore or Backtest code only yeild the
last Line possible.
>
> > The same, and much more serious, difficulty
seems to rear its
head for
> > LINEARRAY-generated lines!
>
> Thanks, Jack Kinsey
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