[amibroker] Question on Position Size

["Al Venosa" <advenosa@xxxxxxxxxxxx>]

Hi, all:
 
I'm embarrassed to ask this simple question, but it has so far stumped me. 
It has to do with the positionsize function. Suppose I'm using the following 
positionsize statement with an initial equity of $100,000:
 
PositionSize = -2; //invest 2% of current equity in each trade or 
$2000
 
Now, suppose I wanted to add a term to the right side of the above 
equation, such as increasing the position size by adding 5% of profits to future 
purchases after making $10,000. I first define net equity, then define the % of 
profits to be added:
 
E=Equity(1);NetE = E-100000; //net 
profitE1=iif(NetE>=10000,0.05*NetE,0);
 
What would the new positionsize statement be? Obviously, it would not 
be
 
PositionSize = -2 + E1;
 
because algebraically, the right side of the equation is -2 + 500 or 498. I 
guess what I am asking is, how does Amibroker know that a negative number 
actually means a percent of current equity, and how does one add to that amount 
if he wants to increase his bet size? 
Al Venosa<A 
href="">advenosa@xxxxxxxxxxxx<FONT 
color=#0000ff>
 
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