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Hello Tomasz,
thank you again - for example like this ...?
********************************************************
SetBarsRequired( 10000, 0 );
nPips = Optimize("nPips",0.0001,0.0001,0.0150,0.0001);
//nPips = 0.0015; // define your own value here
PREV = TrStopLevel = C[ 0 ]; // init first element
for( i = 1; i < BarCount; i++ )
{
CurC = C[ i ]; // current value of close
PrevC = C[ i - 1 ]; // previous bar value of close
CurTrStopLevel =
IIf( CurC == PREV, PREV,
IIf( ( (PrevC < PREV) AND (CurC < PREV) ),
Min( PREV, CurC * ( 1 + nPips) ),
IIf( ( PrevC > PREV) AND ( CurC > PREV ),
Max( PREV, CurC * (1 - nPips ) ),
IIf( CurC > PREV, CurC * ( 1 - nPips), CurC * ( 1 + nPips) ) ) ) );
TrStopLevel[ i ] = CurTrStopLevel; // store result
PREV = CurTrStopLevel; // save previous value for next iteration
}
Buy = Cross(Close,TrStopLevel);
Sell = Cross(TrStopLevel,Close);
Short = Cross(TrStopLevel,Close);
Cover = Cross(Close,TrStopLevel);
PositionSize = 100000;
//Graph0 = TrStopLevel; // just for plotting
********************************************************
Kindest regards
Robert
--- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <amibroker@xxxx>
wrote:
> Hello,
>
> First please note that the code is for trailing stop part only.
> It does NOT contain buy/sell rules therefore can not be directly
> "backtested" - you have to add buy/sell rules first.
>
> Second - you should not change SetBarsRequired nor PREV =
TrStopLevel = C[ 0 ]
> - those lines must remain the same.
>
> Third - the only line you may to change in the code fragment I
posted is
> nPips line.
>
> Best regards,
> Tomasz Janeczko
> amibroker.com
> ----- Original Message -----
> From: "rocou" <rocou@xxxx>
> To: <amibroker@xxxxxxxxxxxxxxx>
> Sent: Tuesday, April 27, 2004 12:28 AM
> Subject: [amibroker] Re: Dear Traders, this seems to be an
absolutely amazing ...
>
>
> Tomasz,
>
> may I ask once more:
>
> what do I have to fill in, if I want to backtest the past
> from January 1999 until today ?
>
> -> SetBarsRequired( ______,__ ); ?
> -> PREV = TrStopLevel = C[ __ ]; ?
>
> and is there anything else except "nPips"that I have
> to specify ??
>
> Thanks again
> Kindest regards
> Robert
>
> --- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <amibroker@xxxx>
> wrote:
> > Hello,
> >
> > >the "maximum amount of thanks" for your help !!!!!
> > >I will try to follow your explanation.
> >
> > You are welcome.
> >
> > >I tried to contact you via email several times,
> > >but never received an answer. Might it be, that there
> > >is something wrong with your email client or are you
> > >"just" too busy ?
> >
> > I have checked my e-mail box and I have received
> > only one e-mail from you recently (23 April). You have sent
> > the same message to support address too and Marcin answered
> > initially and today I have provided longer reply including the
same
> > code that I posted here.
> > Did you send anything more that I am not aware of?
> >
> > Best regards,
> > Tomasz Janeczko
> > amibroker.com
> > ----- Original Message -----
> > From: "rocou" <rocou@xxxx>
> > To: <amibroker@xxxxxxxxxxxxxxx>
> > Sent: Monday, April 26, 2004 11:45 PM
> > Subject: [amibroker] Re: Dear Traders, this seems to be an
> absolutely amazing ...
> >
> >
> >
> >
> > I tried to contact you via email several times,
> > but never received an answer. Might it be, that there
> > is something wrong with your email client or are you
> > "just" too busy ?
> >
> > Thanks again for your very apreciated help !!
> > Kindest regards
> > Robert
> >
> >
> > --- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko"
<amibroker@xxxx>
> > wrote:
> > > Rocou,
> > >
> > > The "PREV" has been covered many times in the past.
> > > It is easy to find in the mailing list archive
> > > http://www.amibroker.com/listarchive.html
> > >
> > > Take a look at:
> > > http://groups.yahoo.com/group/amibroker/message/45225
> > >
> > > http://groups.yahoo.com/group/amibroker/message/4507
> > > http://groups.yahoo.com/group/amibroker/message/11896
> > > http://groups.yahoo.com/group/amibroker/message/31088
> > >
> > > Some of formulas using PREV may be rewritten using AMA/AMA2
> > > but ALL (I mean *ALL*) of them can be rewritten using looping
> > > (see http://groups.yahoo.com/group/amibroker/message/45225 )
> > >
> > > Specifically your "problem" code:
> > > TrStopLevel:=If(C=PREV, PREV, If(((Ref(C,-1)<PREV)
> > > AND (C<PREV)), Min(PREV,C*(1+nPips)),If((Ref(C,-1)>PREV)
> > > AND (C>PREV), Max(PREV,C*(1-nPips)), If(C>PREV,C*(1-nPips),C*
> > > (1+nPips)))));
> > >
> > > can be rewritten using loop too.
> > >
> > > First step is to "UNFOLD" ugly written code to the form that is
> > easier to read and understand:
> > >
> > > TrStopLevel =
> > > If( C = PREV, PREV,
> > > If( ( (Ref(C,-1) < PREV) AND (C < PREV) ),
> > > Min( PREV, C* (1+nPips) ),
> > > If( (Ref(C,-1) > PREV) AND ( C > PREV ),
> > > Max( PREV, C * (1 - nPips ) ),
> > > If( C > PREV, C * (1-nPips), C *
(1+nPips) ) ) ) );
> > >
> > >
> > > Now this can be rewritten using for loop:
> > >
> > > SetBarsRequired( 10000, 0 );
> > >
> > > nPips = 0.004; // define your own value here
> > > PREV = TrStopLevel = C[ 0 ]; // init first element
> > >
> > > for( i = 1; i < BarCount; i++ )
> > > {
> > > CurC = C[ i ]; // current value of close
> > > PrevC = C[ i - 1 ]; // previous bar value of close
> > >
> > > CurTrStopLevel =
> > > IIf( CurC == PREV, PREV,
> > > IIf( ( (PrevC < PREV) AND (CurC < PREV) ),
> > > Min( PREV, CurC * ( 1 + nPips) ),
> > > IIf( ( PrevC > PREV) AND ( CurC > PREV ),
> > > Max( PREV, CurC * (1 - nPips ) ),
> > > IIf( CurC > PREV, CurC * ( 1 - nPips), CurC * ( 1
+
> > nPips) ) ) ) );
> > >
> > > TrStopLevel[ i ] = CurTrStopLevel; // store result
> > > PREV = CurTrStopLevel; // save previous value for next
> iteration
> > > }
> > >
> > > Graph0 = TrStopLevel; // just for plotting
> > >
> > > What I did ?
> > > It is fairly simple:
> > > I have just wrapped the MS code into the for loop, replaced
arrays
> > with scalars
> > > ( C replaced with CurC = C[ i ] , Ref( C, -1 ) replaced with
PrevC
> > = C[ i - 1 ].
> > > PREV in my code is a temporary variable that holds previous
value
> > of calculation in the loop .
> > >
> > > This way I can keep almost entire code as it was.
> > >
> > > Advantage? It runs 100x faster than in Metastock. Try it - run
> > backtest in MS and in AB and compare times.
> > >
> > > Best regards,
> > > Tomasz Janeczko
> > > amibroker.com
> > > ----- Original Message -----
> > > From: "rocou" <rocou@xxxx>
> > > To: <amibroker@xxxxxxxxxxxxxxx>
> > > Sent: Monday, April 26, 2004 9:51 PM
> > > Subject: [amibroker] Dear Traders, this seems to be an
absolutely
> > amazing ...
> > >
> > >
> > > Dear Traders,
> > >
> > > this seems to be an absolutely amazing formula
> > > from my broker CMS. Sorry if I am getting on your nerves again,
> > > but I really need your help how to EXACTLY translate the formula
> > > into Amibrokerīs AFL for backtesting.
> > >
> > > The trailing stop is based on a certain amount of pips ("nPip")
> > > that you define , NOT on any kind of ATR/volatility !!
> > >
> > > Buy/Sell and Short/Cover signals are generated, if close value
> > > crosses the TrailingStoppLevel Line. That is the whole story.
> > > You only have to define the amount of "nPip"īs.
> > >
> > > The image shows the 15min chart EURUSD and 15 as the value
> > > for the nPips parameter.
> > >
> > > The image is in folder "Photos" of this group:
> > >
> >
>
http://photos.groups.yahoo.com/group/amibroker/vwp?.dir=/&.src=gr&.dnm
> > > =Trailing+Stop+System.jpg&.view=t&.done=http%
> > > 3a//photos.groups.yahoo.com/group/amibroker/lst%3f%26.dir=/%
> > 26.src=gr%
> > > 26.view=t[/img]
> > >
> > > I politely ask all of you to help me EXACTLY translating this
> > > formula into AFL for backtesting/optimizing "nPip"
possibilities.
> > > I guess it would be a great chance for all of us to trade with
> > > a simple but very effective trading system.
> > >
> > > Kindest regards
> > > Robert
> > >
> > > Here again the formula from CMS:
> > > ___________________________________________________________
> > > {Trailing Stop Loss}
> > >
> > > TrStopLevel:=If(C=PREV, PREV, If(((Ref(C,-1)<PREV)
> > > AND (C<PREV)), Min(PREV,C*(1+nPips)),If((Ref(C,-1)>PREV)
> > > AND (C>PREV), Max(PREV,C*(1-nPips)), If(C>PREV,C*(1-nPips),C*
> > > (1+nPips)))));
> > >
> > > {Signal Up and Down}
> > >
> > > Up:= Cross(Close,TrStopLevel);
> > > Down:= Cross(TrStopLevel,C);
> > >
> > > {OpenBuy and CloseBuy}
> > >
> > > OpenBuy:=
> > > Up and (eventCount('OpenBuy')= eventCount('CloseBuy'));
> > > CloseBuy:=
> > > Down and (eventCount('OpenBuy')>eventCount('CloseBuy'));
> > >
> > > {OpenSell and CloseSell}
> > >
> > > OpenSell:=
> > > Down and (eventCount('OpenSell')= eventCount('CloseSell'));
> > > CloseSell:=
> > > Up and (eventCount('OpenSell')>eventCount('CloseSell'));
> > > ___________________________________________________________
> > >
> > >
> > >
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> >
> >
> >
> >
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>
>
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