Carl,
You might want to have a look at this code, supplied by Thomas Janeczko
in the AFL library. It is for Double Tops, but you can modify it for the double
bottoms.
Look at the function reference for PEAK, TROUGHS and ZIGZAG
also.
Tom
/* Detecting double tops */
percdiff = 3; /* peak detection
threshold */
fwdcheck = 5; /* forward
validity check */
mindistance = 5;
validdiff = percdiff/400;
PK= Peak( H, percdiff, 1 ) == High;
x = Cum( 1 );
XPK1 = ValueWhen( PK, x, 1 );
XPK2 = ValueWhen( PK, x, 2 );
peakdiff = ValueWhen( PK, H, 1 )/ValueWhen( PK, H, 2 );
doubletop = PK AND abs( peakdiff - 1 ) < validdiff
AND (XPK1 - XPK2)>mindistance
AND High > HHV( Ref( H,
fwdcheck ), fwdcheck - 1 );
Buy = Sell = doubletop;
//IIf(doubletop,PlotShapes(
shapeSmallDownTriangle, colorGreen, 5 ),"");
PlotShapes( IIf( Buy, shapeDigit9 +
shapePositionAbove, shapeNone ), colorAqua );
//GraphXSpace = 5;
WriteIf( Highest( doubletop ) == 1, "AmiBroker
has detected some possible double top patterns for " + Name() + "\nLook for
green arrows on the price chart.", "There are no double top patterns
for " + Name() );
From:
amibroker@xxxxxxxxxxxxxxx [mailto:amibroker@xxxxxxxxxxxxxxx] On Behalf Of Carl
Vanhaes
Sent: Thursday, September 25, 2008 8:37 AM
To: amibroker@xxxxxxxxxxxxxxx
Subject: [amibroker] Help coding double bottom
Hi,
I am still a newbie switching from easylanguage to AFL and am trying
to plot double bottoms that are separated only by a few bars.
Something must be wrong with my coding below because no signal is
generated despite I can see those patterns on the charts.
Basically the idea is: Price tries to break down a recent low but
fails and rebounds on or just after the breakdown bar (think it is
sometimes called a Vic2B pattern).
Can you please help me correct this code:
Condition1= Low = LLV(L,25);
Condition2= Ref(Sum(Condition1,7),-1)==0 AND Ref(Sum(Condition1,13),-
1)>0 AND Cross(Ref(ValueWhen(Condition1, L, 1),-1),L);
Condition3= (Cross(C, ValueWhen(Condition2, H, 1))) AND (ValueWhen
(Condition2,L,1) == LLV(L,30));
PlotShapes( IIf( Condition5, shapeUpArrow, shapeNone ), colorGreen );
Filter = Condition5 OR Condition6;
AddTextColumn(FullName(), "Company Name");
AddColumn(Condition5, "Dble_bot", 1);
AddColumn(C, "Close", 1.3);
Thank you in advance,
Carl
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