[amibroker] Disallow recalculation of previous values in indicator?

["would_should" <would_should@xxxxxxxxx>]

example; The number of periods for a variable MA is increased by 1 for 
each new bar. If current period is 10, I would like for the y value to 
remain as lastvalue(ma(c,10)) instead of ref(ma(c,11),-1) when the 
periods are increased from 10 to 11. In short, all values are to be 
calculated only once. Is this possible in AFL? Thanks for any tips or 
explanations.


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