This is just an untested idea but, one could use IIF statement

UP = IIf(C > O, (C-O), 0); //store UP value in UP variable array (if 
Upday then UPvalue = Close-Open, if not an UPday then = 0
U = EMA(UP, period); //smooth UP array

Can you post a link to this article so, I can uderstand the idea a 
bit better?

Regards
Richard

--- In [email protected], shahariar <shahari...@...> wrote:
>
> But how U and D would be coded? it seems bitcomplex as for 
different stocks and  different time periods the gains/lose's days 
would be different...
>  
> thanks,
>  
> shahariar
>


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