[amibroker] Delay first BUY signal by x bars

[furinkazaan <furinkazaan@xxxxxxxxx>]

Hi,
if Buy= cross(ema(c, 15), ema(c,50))
then it is recommended that no signals be taken till (as a thumb rule)  - Largest EMA * 3 periods
In this case how do instruct to postpone taking the first BUY signal till 50*3 =150 bars from the befining of test period? 

Do I do something like  - iff(barindex() <=300, buy=0, buy) ??

Sorry if the code looks clunky - I am an absolute rookie and I have just written my first system AFL today. Still figuring if it works the way i intended it to! B-). But Amibroker rocks!
TIA
-- 
regards,
kazaan

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