RE: ELA to Text - John Ehler's Free ZEROLAG S&P Daytrading system

["Ron Dawes" <ron@xxxxxxxxx>]

{***************************************************************************
******
			Zero Lag S&P Daytrading System
			Copyright (c) 2000   MESA Software

Notes:	1.  Uses 45 minute bars of the S&P 500 Futures contract.
		2.  Always exit trades at the end of the day.
		3.  Money management stops are set to $1500.
		4.  Trades about 1.5 times per week.
		5.  Uses a Hilbert Transform and a dominant cycle estimate.  DOES NOT use
the MESA algorithm.
		6.  R-MESA uses the MESA algorithm and is a proven robust trading system.

****************************************************************************
*****}

Inputs:	Price((H+L)/2),
		alpha(.22);

Vars:	Imult (.635),
		Qmult (.338),
		InPhase(0),
		Quadrature(0),
		Phase(0),
		DeltaPhase(0),
		count(0),
		InstPeriod(0),
		Period(0),
		Trendline(0),
		ZeroLag(0),
		Ht(0),
		Lt(0),
		Yh(0),
		Yl(0);

{Set yesterday's high and low}
If Date <> Date[1] then begin
	Ht = H;
	Lt = L;
	Yh = Ht[1];
	Yl = Lt[1];
end;

{Establish today's high and low}
If H > Ht then Ht = H;
If L < Lt then Lt = L;

{Initialize ZeroLag}
If CurrentBar = 5 then begin
	ZeroLag = (H+L)/2;
end;

If CurrentBar > 5 then begin
	{Compute zero lag Kalman filter}
	ZeroLag = alpha*(Price + .4*(Price - Price[1])) + (1 - alpha)*ZeroLag[1];

	{Detrend Price}
	Value3 = Price - Price[7];

	{Compute InPhase and Quadrature components}
 	Inphase = 1.25*(Value3[4]  - Imult*Value3[2]) + Imult*InPhase[3];
	Quadrature = Value3[2] - Qmult*Value3 + Qmult*Quadrature[2];

	{Use ArcTangent to compute the current phase}
	If AbsValue(InPhase +InPhase[1]) > 0 then Phase =
ArcTangent(AbsValue((Quadrature+Quadrature[1]) / (InPhase+InPhase[1])));

	{Resolve the ArcTangent ambiguity}
	If InPhase < 0 and Quadrature > 0 then Phase = 180 - Phase;
	If InPhase < 0 and Quadrature < 0 then Phase = 180 + Phase;
	If InPhase > 0 and Quadrature < 0 then Phase = 360 - Phase;

	{Compute a differential phase, resolve phase wraparound, and limit delta
phase errors}
	DeltaPhase = Phase[1] - Phase;
	If Phase[1] < 90 and Phase > 270 then DeltaPhase = 360 + Phase[1] - Phase;
	If DeltaPhase < 1 then DeltaPhase = 1;
	If DeltaPhase > 60  then Deltaphase = 60;

	{Sum DeltaPhases to reach 360 degrees.  The sum is the instantaneous
period.}
	InstPeriod = 0;
	Value4 = 0;
	For count = 0 to 40 begin
		Value4 = Value4 + DeltaPhase[count];
		If Value4 > 360 and InstPeriod = 0 then begin
		InstPeriod = count;
		end;
	end;

	{Resolve Instantaneous Period errors and smooth}
	If InstPeriod = 0 then InstPeriod = InstPeriod[1];
	Value5 = .25*(InstPeriod) + .75*Period[1];

	{Compute Trendline as simple average over the measured dominant cycle
period}
	Period = IntPortion(Value5);
	Trendline = 0;
	For  count = 0 to Period - 1 begin
		Trendline = Trendline + Price[count];
	end;
	If Period > 0 then Trendline = Trendline / Period;

	{Demand an outside day to trade}
	If Date >= 0 and (Ht >= Yh or Lt <= Yl) then begin
		{New positions are entered at the end of the second bar of the day}
		If Date = Date[1] and Date > Date[2] and MarketPosition = 0 then begin
			If ZeroLag > Trendline and Open > Open[1] and High > High[1] and Close[1]
> Low[1] + (High[1] - Low[1])/ 3 then buy;
			If ZeroLag < Trendline and Open < Open[1] and Low < Low[1] and Close[1] <
High[1] - (High[1] - Low[1])/ 3 then sell;
		end;
		If ZeroLag Crosses Over Trendline and High < High[1] and C>L+(H-L)/2 then
buy;
		If ZeroLag Crosses Under Trendline and Low > Low[1] and C<H-(H-L)/2 then
sell;
	end;

end;

-----Original Message-----
From: Vince and Jonathan Castelli [mailto:vcastell@xxxxxxxxx]
Sent: Saturday, February 26, 2000 12:18
To: omega-list@xxxxxxxxxx
Subject: ELA to Text - John Ehler's Free ZEROLAG S&P Daytrading system


Could someone please translate the attached .ela file to text for me?

Thanks!