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[amibroker] Turtle Trading Rules in Tradestation - Can someone help me with non moving STOP



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I'd like to write the code for a stop that is 2*ATR below the price 
at which I buy the stock.  I can't figure it out.  I am trying to 
translate the Turtle Trading Rules below.  Has anyone tried this?  
Can someone tell me how to do the STOP?

I tried ApplyStop but couldn't figure it out.  I am totally new to 
AFL, and to Amibroker.  

Thanks, Balin Butler





/// Turtle 20-Day Breakout 
Replica ////////////////////////////////////// 

vars: N(0),StopLoss(1),DV(0),BB(0),AccountBalance(0),DollarRisk
(0),LTT(0), 
Tracker(0),LastTrade(0),HBP(0),LBP(0); input: InitialBalance
(100000),Length(20); 

if marketposition = 0 then begin 
BB = 0; 
N = xAverage( TrueRange, Length ); 
DV = N * BigPointValue; 

AccountBalance = InitialBalance; 
DollarRisk = AccountBalance * .01; 
LTT = IntPortion(DollarRisk/DV); 
StopLoss = 2 * DV * LTT; 

if LastTrade = -1 then begin 
buy LTT shares next bar highest(h,20) or higher; 
buy LTT shares next bar highest(h,20) + (0.5*N) or higher; 
buy LTT shares next bar highest(h,20) + (1.0*N) or higher; 
buy LTT shares next bar highest(h,20) + (1.5*N) or higher; 
sellshort LTT shares next bar lowest(l,20) or lower; 
sellshort LTT shares next bar lowest(l,20) - (0.5*N) or lower; 
sellshort LTT shares next bar lowest(l,20) - (1.0*N) or lower; 
sellshort LTT shares next bar lowest(l,20) - (1.5*N) or lower; 
end; 

if LastTrade = 1 then begin 
buy LTT shares next bar highest(h,55) or higher; 
buy LTT shares next bar highest(h,55) + (0.5*N) or higher; 
buy LTT shares next bar highest(h,55) + (1.0*N) or higher; 
buy LTT shares next bar highest(h,55) + (1.5*N) or higher; 
sellshort LTT shares next bar lowest(l,55) or lower; 
sellshort LTT shares next bar lowest(l,55) - (0.5*N) or lower; 
sellshort LTT shares next bar lowest(l,55) - (1.0*N) or lower; 
sellshort LTT shares next bar lowest(l,55) - (1.5*N) or lower; 
end; 

end; 

// PREVIOUS TRADE TRACKER 
if HBP = 0 and h > highest(h,19)[1] then begin 
Tracker = 1; HBP = h; LBP = 0; 
end; 

if LBP = 0 and l < lowest(l,19)[1] then begin 
Tracker = -1; LBP = l; HBP = 0; 
end; 

if Tracker = 1 then begin 
if l < HBP - (2*N) then LastTrade = -1; 
if h > HBP + (4*N) then LastTrade = 1; 
end; 

if Tracker = -1 then begin 
if h > LBP + (2*N) then LastTrade = -1; 
if l < LBP - (4*N) then LastTrade = 1; 
end; 

// LONG 20 
if LastTrade = -1 and marketposition = 1 then begin 
BB = BB + 1; 
if currentshares = LTT then begin 
buy LTT shares next bar highest(h,20)[BB] + (0.5*N) or higher; 
buy LTT shares next bar highest(h,20)[BB] + (1.0*N) or higher; 
buy LTT shares next bar highest(h,20)[BB]+ (1.5*N) or higher; 
end; 

if currentshares = LTT * 2 then begin 
buy LTT shares next bar highest(h,20)[BB] + (1.0*N) or higher; 
buy LTT shares next bar highest(h,20)[BB] + (1.5*N) or higher; 
end; 

if currentshares = LTT * 3 then 
buy LTT shares next bar highest(h,20)[BB] + (1.5*N) or higher; 
end; 

// LONG 55 
if LastTrade = 1 and marketposition = 1 then begin 
BB = BB + 1; 
if currentshares = LTT then begin 
buy LTT shares next bar highest(h,55)[BB] + (0.5*N) or higher; 
buy LTT shares next bar highest(h,55)[BB] + (1.0*N) or higher; 
buy LTT shares next bar highest(h,55)[BB]+ (1.5*N) or higher; 
end; 
if currentshares = LTT * 2 then begin 
buy LTT shares next bar highest(h,55)[BB] + (1.0*N) or higher; 
buy LTT shares next bar highest(h,55)[BB] + (1.5*N) or higher; 
end; 
if currentshares = LTT * 3 then 
buy LTT shares next bar highest(h,55)[BB] + (1.5*N) or higher; 
end; 
sell ("out-S") next bar lowest(l,10) or lower; 

// SHORT 20 
if LastTrade = -1 and marketposition = -1 then begin 
BB = BB + 1; 
if currentshares = LTT then begin 
sellshort LTT shares next bar lowest(l,20)[BB] - (0.5*N) or lower; 
sellshort LTT shares next bar lowest(l,20)[BB] - (1.0*N) or lower; 
sellshort LTT shares next bar lowest(l,20)[BB] - (1.5*N) or lower; 
end; 
if currentshares = LTT * 2 then begin 
sellshort LTT shares next bar lowest(l,20)[BB] - (1.0*N) or lower; 
sellshort LTT shares next bar lowest(l,20)[BB] - (1.5*N) or lower; 
end; 
if currentshares = LTT * 3 then 
sellshort LTT shares next bar lowest(l,20)[BB] - (1.5*N) or lower; 
end; 

// SHORT 55 
if LastTrade = 1 and marketposition = -1 then begin 
BB = BB + 1; 
if currentshares = LTT then begin 
sellshort LTT shares next bar lowest(l,55)[BB] - (0.5*N) or lower; 
sellshort LTT shares next bar lowest(l,55)[BB] - (1.0*N) or lower; 
sellshort LTT shares next bar lowest(l,55)[BB] - (1.5*N) or lower; 
end; 
if currentshares = LTT * 2 then begin 
sellshort LTT shares next bar lowest(l,55)[BB] - (1.0*N) or lower; 
sellshort LTT shares next bar lowest(l,55)[BB] - (1.5*N) or lower; 
end; 
if currentshares = LTT * 3 then 
sellshort LTT shares next bar lowest(l,55)[BB] - (1.5*N) or lower; 
end; 
buytocover ("out-B") next bar highest(h,10) or higher; 

// STOPS 
if currentshares = (2 * LTT) then StopLoss = DV * 3.5 * LTT; 
if currentshares = (3 * LTT) then StopLoss = DV * 4.5 * LTT; 
if currentshares = (4 * LTT) then StopLoss = DV * 5.0 * LTT; 
setstoploss (StopLoss); 

// COMMENTARY 
commentary ("LTT: ",LTT,Newline); 
commentary ("CurrentShares: ",CurrentShares,Newline); 
commentary ("StopLoss: ",StopLoss,Newline); 
commentary ("AccountBalance:",AccountBalance,NewLine); 
commentary ("LastTrade: ",LastTrade,NewLine); 





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