[amibroker] AFL loop question

["richpach2" <richpach2@xxxxxxxxx>]

Hello,

Can some please expain use of loop (if, while etc) expression in AFL?
When do one need to use a loop and when can one just rely on 
processing of the array bar-by-bar. I am still learining AFL language 
and this area is a bit grey.

I noticed many Stop processing AFL use "for" loop but I don't 
understand why.
Also, if I can use this statement toi define EMA;

P = ParamField("Price field",-1);
Periods = Param("Periods", 15, 2, 300, 1, 10 );
Plot( EMA( P, Periods ), _DEFAULT_NAME(), ParamColor( "Color", 
colorCycle ), ParamStyle("Style") ); 

why would I try this AFL doc example;

myema[ 0 ] = Close[ 0 ]; 
for( i = 1; i < BarCount; i++ ) 
{ 
    myema[ i ] = 0.1 * Close[ i ] + 0.9 * myema[ i - 1 ]; 
} 
This example iterates all bars of close array to calculate 
exponential moving average.

Regards
Richard



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