[amibroker] Mony managmenet question

["rashidfarah_98" <rashidfarah_98@xxxxxxxxx>]

Does any one know how to exit from a position partially
after it rises a certain % in relation to the
available portfolio equity?


For example, if I initially start with $50,000,then
open 10 positions each holding $10,000. That is 20% of
the total equity for each position.
Now, I would have a trailing stop to exit say 7%. But
also I would not allow a position to comprise more
than 30% of the total portfolio equity. Once the
position reaches 30% of folio I sell 10% and keep the
value that is equivalent to the original 20%.

So the question is how do I exit partially. It seems
this has to be done within portfolio backtester.

I know the following:
1- total equity:
	CurrentPortfolioEquity = bo.Equity;
2- The value of each open position
	nInvestedValue = 0;
	for(openpos = bo.GetFirstOpenPos(); openpos; openpos = 
bo.GetNextOpenPos()) { 
		nInvestedValue = nInvestedValue + 
openpos.GetPositionValue();
		nOpenPositions++;
	}

Now you there is something similar as shown in the code
bellow. But, this is at the system level and generic
for all positions.
I am not sure we can link this with "bo.Equity".

Can anyone help by pointing me the way.

Thanks,
Rashid
 
==================
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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