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Hi,
I haven't tested any of the following, so you'll need to do your own due diligence. But I suspect the following...
1. SetPositionSize just popluates the resereved array named PositionSize.
2. You should not be calling SetPositionSize repeatedly from within a loop. This method sets all bars of the PositionSize array, replacing whatever was there before (i.e. you are clobbering the array every call).
3. If you want to change a single bar of the PositionSize array, just reference it using standard array dereference operator [].
So, try moving your call to SetPositionSize(10, spsPercentOfEquity ) to before the loop such that every bar is initialized to that value.
Then, within your loop, just change the i-th bar of the PositionSize array. Note that the documentation of SetPositionSize indicates that percentage of position values will be in the range -1000 to -2000. Thus, to set 200 spsPercentageOfPosition do PositionSize[i] = -1200.
See if that works for you.
Mike
--- In amibroker@xxxxxxxxxxxxxxx, "ronspieker" <tip001@xxx> wrote:
>
> Newbie question:
>
> Can you reset the SetPositionSize function at various points in the code? (For variable size postions) For example, for the first buy signal
>
> SetPositionSize(10, spsPercentOfEquity );
>
> Then for the second buy trigger, triple the position
>
> SetPositionSize(200, spsPercentOfPosition);
>
>
> An example code (which only triggers the first position size statement) would be
>
>
> SetTradeDelays( 0, 0, 0, 0 );
> SetOption("MaxOpenPositions", 4);
>
>
> _TRACE("!CLEAR!");
>
>
> //Buy and Sell Conditions
>
> Cond1 = Close > MA (C , 200);
> Cond2 = RSI(2) <25;
> Cond4 = RSI(2) >70;
>
> // Initialize
>
> BuyPriceA=BuyPriceB=BuypriceC=BuypriceD=0;
> intrade=0;
> Tradedate=DateTime();
> TradedateA=TradedateB=TradedateC=Null;
>
> // Loop through all the bars
>
> for(i = 1; i < BarCount; i++)
> {
>
> if(intrade==0)
> {
> if((Cond1[i]==1) AND (Cond2[i]==1) ) //Enter Position 1
> {
>
> Intrade=1;
> Buy[i] = 1;
> BuyPriceA = BuyPrice[i];
> TradedateA=Tradedate[i];
>
> }
> else
> {
>
> }
> }
>
>
> if((intrade==1) AND tradedateA != Tradedate[i])
> {
>
> if (C[i]<BuyPriceA) //Enter position 2
> {
> SetPositionSize(200, spsPercentOfPosition);
> Intrade=2;
> Buy[i]=1;
> BuyPriceB=BuyPrice[i];
> TradedateB=Tradedate[i];
> }
>
> else
> {
>
> }
> }
>
>
> if((intrade==1 OR intrade==2 ) AND (Cond4[i]==1))
> {
> Sell[i]=Cond4[i];
> intrade=0;
> BuyPriceA=0;
> BuyPriceB=0;
>
> }
>
>
>
> }
>
> SetPositionSize(10, spsPercentOfEquity );
>
------------------------------------
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