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Re: [amibroker] Sum query



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Andrew

Sum(condition,3);

adds up the number of times the condition is true in a
period of three bars.

So then

Sum(condition,3) == 3;

returns a true value if the sum of the number of times
the condition is true in a period of three bars is
exactly equal to 3.

Regards

ChrisB
--- Andrew Z <wizard@xxxxxxxxxxxxxxx> wrote:
> 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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