Set the option in the Analysis settings window, else add directly to 
code:

SetOption("MaxOpenPositions", 1 );

More details in the user guide:

http://www.amibroker.com/guide/h_portfolio.html

Mike

--- In [email protected], Noah Bender <knowaben...@...> wrote:
>
> Hello all,
> 
> 
> I am new to amibroker and am tryng to set up a strategy. i would 
like to
> only execute trades when I have no open position.
> 
> Does anyone know how I can write that in AFL??? I only only buy and 
go short
> when current position is zero.
> 
> thanks
>


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