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Jim,
Yes, you have missed something obvious here...
Tomasz told you twice that in order to accomplish what you want, then
you must use something similar to the example looping code he posted
in his first response.
And I made a post with the Subject line of "Trailing Stop Example",
that gave you an even closer solution to what you want to accomplish.
But you don't seem to want follow the suggested approach, so you
continue to try to fit a square peg into a round hole.
In order to backtest a trailing stop condition as you described, you
*MUST* resort to the looping approach that was presented to you. There
is no other choice based upon the current capabilities of AB.
I can tell you from experience that if you don't understand why this
is so, then there is something fundamental that you don't understand
about AB AFL... and in that case then go back and make a 2nd or 3rd
pass thru the AFL Tutorial.
Regards,
Phsst
--- In amibroker@xxxxxxxxxxxxxxx, "jwilsonp2a" <j1wilson@xxxx> wrote:
> Tomasz,
>
> I understand your first point about Volatile=True. As far as
> modifying BuyPrice and SellPrice, I took those two lines:
>
> BuyPrice=Max(BuySTOP,Low);
> SellPrice=Min(SellSTOP,High);
>
> directly from the user guide. Am I missing something obvious here?
>
> Thanks, Jim
>
>
>
> --- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <amibroker@xxxx>
> wrote:
> > Hello,
> >
> > No the code is incorrect.
> > If you use Volatile = False (and you do in your code)
> > the value of stop is locked at entry bar it
> > it does not change during the trade.
> >
> > You would need to use Volatile = True.
> >
> > Second error is modifying BuyPrice and SellPrice arrays.
> > These are reserved variable names. Should be used
> > as INPUT for backtester to change the prices of ordinary
> > entries/exits (not exits by stop).
> >
> > As I wrote already the stop you want to achieve could
> > be programmed with the loop that I already posted code for.
> >
> > Best regards,
> > Tomasz Janeczko
> > amibroker.com
> > ----- Original Message -----
> > From: "jwilsonp2a" <j1wilson@xxxx>
> > To: <amibroker@xxxxxxxxxxxxxxx>
> > Sent: Saturday, October 25, 2003 3:08 AM
> > Subject: [amibroker] Re: trailing stop question from new user
> >
> >
> > >
> > > Tomasz,
> > >
> > > Can you please comment on this, from my earlier post?
> > >
> > > I seem to have a workaround, after finding that I could
> > > vary the trailing stop percentage with a variable:
> > > (comments please !!)
> > >
> =====================================================================
> > >
> =====================================================================
> > > SellSTOP=(ValueWhen(Buy,Ref(High,-1),N=1));
> > > /* LOCK IN A FIXED STOP PRICE ON DAY OF ENTRY */
> > >
> > > BuyPrice=Max(BuySTOP,Low);
> > > SellPrice=Min(SellSTOP,High);
> > >
> > > profit_percent=((100 * (High - BuyPrice)/BuyPrice) >= 10);
> > >
> > > trail_stop_percent=IIf(profit_percent,3,100);
> > >
> > > ApplyStop(2,1,trail_stop_percent,True,False);
> > > /* IF PROFIT IS AT LEAST 10%, USE 3% TRAILING STOP, ELSE 100% */
> > >
> > > Sell=Close < SellSTOP;
> > > /* OTHERWISE USE ABSOLUTE STOP LOSS OF Inside Day High ON SETUP
> */
> > >
> > >
> =====================================================================
> > >
> =====================================================================
> > >
> > >
> > >
> =====================================================================
> > >
> =====================================================================
> > >
> > > --- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko"
> <amibroker@xxxx>
> > > wrote:
> > > > Hello,
> > > >
> > > > ApplyStops can be either enabled or disabled.
> > > > You can not change this bar-by-bar.
> > > >
> > > > Instead write a code that uses a loop as shown in the User's
> Guide
> > > for profit target.
> > > >
> > > > /* a sample low-level implementation of Profit-target stop in
> AFL:
> > > */
> > > > Buy = Cross( MACD(), Signal() );
> > > >
> > > > priceatbuy=0;
> > > >
> > > > for( i = 0; i < BarCount; i++ )
> > > > {
> > > > if( priceatbuy == 0 && Buy[ i ] )
> > > > priceatbuy = BuyPrice[ i ];
> > > >
> > > > if( priceatbuy > 0 && SellPrice[ i ] > 1.1 * priceatbuy )
> > > > {
> > > > Sell[ i ] = 1;
> > > > SellPrice[ i ] = 1.1 * priceatbuy;
> > > > priceatbuy = 0;
> > > > }
> > > > else
> > > > Sell[ i ] = 0;
> > > > }
> > > >
> > > > Best regards,
> > > > Tomasz Janeczko
> > > > amibroker.com
> > > > ----- Original Message -----
> > > > From: "jwilsonp2a" <j1wilson@xxxx>
> > > > To: <amibroker@xxxxxxxxxxxxxxx>
> > > > Sent: Thursday, October 23, 2003 9:04 AM
> > > > Subject: [amibroker] trailing stop question from new user
> > > >
> > > >
> > > > >
> > > > > Hi,
> > > > >
> > > > > I am trying to implement a two tiered stop loss, one part
> being
> > > a
> > > > > trailing stop, the other a fixed stop. I want a 3% trailing
> stop
> > > if
> > > > > I am at least 10% profitable, else I want a fixed stop loss
> > > price.
> > > > >
> > > > > I thought I had it, but can't quite figure out how to
> utilize a
> > > > > variable in the ApplyStop(2,x,3,true,false) command. It is
> > > the "x" I
> > > > > just showed that needs to be a 1 to enable, or a 0 to
> disable.
> > > > >
> > > > > Here is a portion of my code:
> > > > >
> > > > > ==================================================
> > > > > .
> > > > > .
> > > > > .
> > > > > BuyPrice = Max(BuySTOP,Low);
> > > > > SellPrice = Min(SellSTOP,High);
> > > > >
> > > > > profit_ten_percent = (((High - BuyPrice)/BuyPrice) >= 0.10);
> > > > > enable_stop = IIf(profit_ten_percent,1,0);
> > > > >
> > > > > ApplyStop(2,enable_stop,3,True,False);
> > > > > Sell = Cross(SellPrice,Low);
> > > > > ==================================================
> > > > >
> > > > > It's the "enable_stop" variable that fouls this up. Is this
> > > strategy
> > > > > even possible? I would greatly appreciate any help on this.
> > > > >
> > > > > Thank you, Jim
> > > > >
> > > > >
> > > > >
> > > > >
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