[amibroker] How do I reference the last purchase price?

["Andre" <SGSTAndre@xxxxxxx>]

I am a newbie. I am stuck. Once I buy I want to set a sales price 
equal to 
"purchase price + some formula()".

My problem is that I can't figure out how to reference my purchase 
price once 'buy' is activated. I've found the reserved 
array "BuyPrice". So if I want to buy at yesterday's high plus a 
"fudge-factor" alpha, I say:

  BuyPrice = Ref(High,-1)+ Alpha ;
  Buy = Cross(High, BuyPrice) ;

Now, if I say:

  Target = BuyPrice + Profit ;

This is not going to work, as BuyPrice will be an array changing 
every day. I need it to freeze on the day I buy and until I sell. 
Isn't there a logical parameter called LONG or somthing?

I tried typing

  if (Buy ==1) {BoughtPrice = BuyPrice} ;

but now I am told that Buy is not a Boolean expression.

How do I get stuff done only AFTER a Buy is executed and before a 
SELL??







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