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[amibroker] sum only positive days



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I want to sum the volume of the last 20 up days and compare it to the last
20 down days. This is not to be confused with summing the up days of the
last 20 bars,  Simple code such as  plot( c>ref(c,-1)"",4,2);  will plot
just the up days and x=iif(c>ref(c,-1),v,0) can calculate the volume but how
do I sum the last 20 bars where x>0 as opposed to summing the last 20 bars
of X  ?

TIA

Regards, 
Jayson 


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