More efficient way to average array element?

I have a 2 dimensional array - write_array(1 to 23, 1 to 7)

When populated slice write_array(2,x) typically look something like this with variation of times and Empty entries

write_array(2,1) = "TIME"
write_array(2,2) = 23.08
write_array(2,3) = 22.58
write_array(2,4) = 23.02
write_array(2,5) = Empty
write_array(2,6) = Empty
write_array(2,7) = 24.02

Where the array element is Empty I want to replace with the average time of the others so Empty would be replaced with (23.08+22.58+23.02+24.02)/4I have the following code which does this

'average recent time        
recenttimecount = 0      
rtSum = 0      
recenttime = Application.WorksheetFunction.index(write_array, 2, 0)      
For rtcount = 2 To UBound(recenttime)      
If Not IsEmpty(recenttime(rtcount)) Then      
recenttimecount = recenttimecount + 1        
rtSum = rtSum + recenttime(rtcount)        
End If      

recenttimeAvg = rtSum / recenttimecount        
For rtcount = 2 To UBound(recenttime)        
If IsEmpty(recenttime(rtcount)) Then        
write_array(2, rtcount) = recenttimeAvg        
End If        

Is there a more efficient way of doing this without 2 FOR loops?

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You can calculate the average directly using the WorksheetFunction class and then iterate thru your array:


Dim averg As Double

averg = Application.WorksheetFunction.Average(Application.WorksheetFunction.Index(write_array,2,0))

For i = 1 to Ubound(write_array,2)

If IsEmpty(write_array(2,i)) Then write_array(2,i) = averg

Next i

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