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Someday I will learn to write what I think:
"This is my attempt (without using looping) for summing the volumes 
on the last N up days:"
should read:
"over the last "pds" up days:"
Note: N is a variable and is the number of bars encompassing "pds".
kris
--- In amibroker@xxxxxxxxxxxxxxx, "kristaura" <camplevel@xxxx> wrote:
> Hello Jason,
> This is my attempt (without using looping) for summing the volumes 
on 
> the last N up days:
> 
> pds=20;
> up=C>ref(C,-1);
> N=barindex()-valuewhen(up,barindex(),pds)+1;
> UpVol=sum(up*V,N);
> Plot(up*V,"Up Days",1,2);
> Plot(UpVol,"Sum Up Vol",1,1);
> 
> kris
> 
> 
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