[amibroker] Re: about the scale out function

["Mike" <sfclimbers@xxxxxxxxx>]

"true" is *any* non zero value. The code is using different non zero  values to indicate what the cause of the Sell was. But, they are all still "true".

Mike

--- In amibroker@xxxxxxxxxxxxxxx, "uman3344" <tan_flamshun818@xxx> wrote:
>
> From the amibroker guideline, it gives an example of the scaleout code.
> Can anyone please explain this code for me "Sell[ i ] = exit + 1;".
> Although commented, I don't quite understand the meaning of "// mark
> appropriate exit code". As far as I know, the sell function is executed
> according to either 1(true) or 0(false). How does this code work to only
> sell when the exit is => 2 which is when secondprofit target (exit
> code=2) and trailing stop (exit code=3) are crossed.
> ------------------------------------------------------------------------\
> ----------------------------
> Example 4: partial exit (scaling out) on profit target stops
> 
> Example of code that exits 50% on first profit target, 50% on next
> profit target and everything at trailing stop:
> 
> Buy = Cross( MA( C, 10 ), MA( C, 50 ) );
> Sell = 0;
> 
> // the system will exit
> // 50% of position if FIRST PROFIT TARGET stop is hit
> // 50% of position is SECOND PROFIT TARGET stop is hit
> // 100% of position if TRAILING STOP is hit
> 
> FirstProfitTarget = 10; // profit
> SecondProfitTarget = 20; // in percent
> TrailingStop = 10; // also in percent
> 
> priceatbuy=0;
> highsincebuy = 0;
> 
> exit = 0;
> 
> for( i = 0; i < BarCount; i++ )
> {
>     if( priceatbuy == 0 AND Buy[ i ] )
>      {
>         priceatbuy = BuyPrice[ i ];
>      }
> 
>     if( priceatbuy > 0 )
>      {
>         highsincebuy = Max( High[ i ], highsincebuy );
> 
>        if( exit == 0 AND
>            High[ i ] >= ( 1 + FirstProfitTarget * 0.01 ) * priceatbuy )
>         {
>           // first profit target hit - scale-out
>           exit = 1;
>           Buy[ i ] = sigScaleOut;
>         }
> 
>        if( exit == 1 AND
>            High[ i ] >= ( 1 + SecondProfitTarget * 0.01 ) * priceatbuy )
>         {
>           // second profit target hit - exit
>           exit = 2;
>           SellPrice[ i ] = Max( Open[ i ], ( 1 + SecondProfitTarget *
> 0.01 ) * priceatbuy );
>         }
> 
>        if( Low[ i ] <= ( 1 - TrailingStop * 0.01 ) * highsincebuy )
>         {
>           // trailing stop hit - exit
>           exit = 3;
>           SellPrice[ i ] = Min( Open[ i ], ( 1 - TrailingStop * 0.01 ) *
> highsincebuy );
>         }
> 
>        if( exit >= 2 )
>         {
>           Buy[ i ] = 0;
>           Sell[ i ] = exit + 1; // mark appropriate exit code
>           exit = 0;
>           priceatbuy = 0; // reset price
>           highsincebuy = 0;
>         }
>      }
> }
> 
> SetPositionSize( 50, spsPercentOfEquity );
> SetPositionSize( 50, spsPercentOfPosition * ( Buy == sigScaleOut ) ); //
> scale out 50% of position
>




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