Dynamically get the volume at a particular time/min on a prior day

AFL Programming
1

I am trying to compare the volume at a particular time to what it was at the same time on a prior day. 'Lookup' will not work because the 'datatime' argument has to be a constant. The 'for loop' solution shown below works. However, it is computationally intensive and i was wondering if there is an array processing solution. Thanks for your anticipated help.

//Get the DateNum of the previous day 
TimeFrameSet( inDaily );
dtYes= DateNum(); 
TimeFrameRestore();
dtYes = TimeFrameExpand( dtYes, inDaily);

// Convert the datenumber to datetime
dtLookBack = DateTimeConvert( 2, dtYes, TimeNum());
dtNow= DateTimeConvert( 2, dt, TimeNum());

t = TimeNum(); 
dt = DateNum(); 
datewindow = Status("barinrange" );
for( i = 0; i < BarCount; i++ ){
	if( datewindow [i] ) {
		for( j = 0; j < BarCount; j++ ){
			if(dtLookBack[i] == dtNow[j] AND t[i] > 93500){	
				VolumeNow [i] = V[i] ];
				VolumeYesterday [i] = V[j]];		
			}	
		}	
	}
	else {
		VolumeYesterday [i] = 0;
		VolumeNow  [i] = 0;	
	}

}

Filter =SUM(VolumeNow,5)  > SUM(VolumeYesterday)*7;