[amibroker] why is formula results stored in array

["murthysuresh" <money@xxxxxxxxxxxxxx>]

I dont understand one fact. 
CheckReady = if(ADX(period) >= 20) this fails becasue the adx is 
returned as a array and not a number.

1. Why is the return value of the Adx function stored as a array. i 
would expect the result to be a decimal number. 

2. What is the best way to cast the array as a number?





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