[amibroker] Sum query

[Andrew Z <wizard@xxxxxxxxxxxxxxx>]

Hey all,

I'm still getting my head around all this AFL code, so bear with me :-)

Take the following code:

Buy=Cross(C,EMA(C,20)) AND C < 10; 
BuyPrice=Open;
Sell=Sum(Open > ValueWhen(Buy,BuyPrice,1),3)==3;

This last line has me a little perplexed. ValueWhen returns the value of 
BuyPrice (which is the Open) on the day the Buy condition was true. What 
I don't get is how the Sum comes into it and how the Sell is triggered.

Thanks,
Andrew.


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