[amibroker] How to neglect the short signal before the sell signal of a long trade ?

["itmwh" <toxutao@xxxxxxxx>]

Hi, I am try to code a futures system . Understanding that to delete 
the multiple signals between the buy and sell point, we can use 

buy=exrem(buy,sell);
sell=exrem(sell,buy);

similarly,

short=exrem(short,cover);
cover=exrem(cover,short);


But I need more than that: I hope to delete the short signals before 
the sell signal of a Long trade is triggered, also , I hope to delete 
the Buy signal before the cover signal of a Short trades are triggered. 
How to implement this in AFL ?  Thanks for any help


Content-Description: "AVG certification"
No virus found in this incoming message.
Checked by AVG Free Edition.
Version: 7.5.441 / Virus Database: 268.18.2/692 - Release Date: 2/18/2007 4:35 PM