FormulaArray not averaging out all the specified entries - vba

Question

Table 1:
G H I J K
| Lane | Bowler | Score | Score | Score | 1
|:-----------|------------:|:------------:|:------------:|:------------:|
| Lane 1 | Thomas| 100 | 100 | 100 | 2
| Lane 2 | column | 200 | 200 | 100 | 3
| Lane 3 | Mary | 300 | 300 | 100 | 4
| Lane 1 | Cool | 150 | 400 | 100 | 5
| Lane 2 | right | 160 | 500 | 100 | 6
| Lane 9 | Susan | 170 | 600 | 100 | 7
say I want to find the average for each Lane that appeared in table 2 and put them in column O:
Table 2:
N O
| Lane | Average | 1
|:-----------|------------:|
| Lane 1 | | 2
| Lane 2 | | 3
| Lane 3 | | 4
I would put
=AVERAGE(IF(N2=$G$2:$G$7, $I$2:$K$7 )) for lane 1 (put this formula on cell "O2")
=AVERAGE(IF(N3=$G$2:$G$7, $I$2:$K$7 )) for Lane 2 ("O3")
=AVERAGE(IF(N4=$G$2:$G$7, $I$2:$K$7 )) for Lane 2 ("O4")
My first question is
What if I want to find the Average of ALL the lane together that appear in table 2. So average of Lane 1, Lane 2 and Lane 3 together (but not other lane, such as lane 9).
My attempt:
= Average(IF(G2:G7 = N2:N4, I2:K:7)) why doesn't this work?
My second question is
I have done the "average of each individual Lane" using vba:
.
Dim i As Integer
For i = 2 To 4
Cells(i, 15).FormulaArray = "=AVERAGE(IF(RC[-1]=R2C7:R7C7,R2C9:R7C12))"
Next i
.
What if I have done it using vba without the .formula method
For Lane 1 only:
pseudo code:
Loop from G2 to G7
If cell (N1) = Gx then //x: 2 to 7
Sum = Sum + Ix + Jx + Kx
}
Average = Sum/totalEntries
Would this be slower than if I were to use the build in .formula? is there a advanage to doing it this way instead?

Answer 1

The answer to the first question about why this FormulaArray
= Average(IF(G2:G7 = N2:N4, I2:K7)) doesn't work?
Is implicit on how this other FormulaArray works:
= AVERAGE( IF( $G$7:$G$12 = $N7, $I$7:$K$12 ) )
Let’s see how each part of this “single-cell formula array” works:
1st part: $G$7:$G$12 = $N7
The first part of the formula generates an array with the records from range $G$7:$G$12 complying with the condition = $N7. Fig. 1 shows the first part of the FormulaArray in as a “multi-cell formula array”.
2nd Part: $I$7:$K$12
The result of the first part is applied to the second part to obtain the range of scores complying with the condition = $N7 (see Fig. 2)
3rd part: AVERAGE
Finally the last part of the formula calculates the average of the scores complying with the condition = $N7
Now let’s try to apply the same analysis to the formula:
= AVERAGE( IF( G2:G7 = N2:N4, I2:K7 ) )
Unfortunately, we cannot go beyond the first part G2:G7 = N2:N4 as it fails trying to compare two arrays of different dimensions thus resulting in #N/A (see Fig. 3)
However, even if the arrays have same dimension the result would not have shown the duplicated values, as the members are compared one to one (see Fig. 4)
To obtain the average for Lanes 1 to 3 use this FormulaArray
=AVERAGE( IF(
( $G$7:$G$12 = $N7 ) + ( $G$7:$G$12 = $N8 ) + ( $G$7:$G$12 = $N9 ),
$I$7:$K$12 ) )
It generates an array with the records complying with the conditions = $N7 + = $N8 + = $N9 (+ equivalent to operator OR)
As regards the second question:
Performance is intrinsically associated to maintenance and efficiency.
The sample procedure just enters a formula which is hard coded and only works for this particular case, for example:
If needed to change the formulas to expand the ranges, the macro has to be updated, it may still have to change the formula but no need to open the VBA editor.
If any of the columns before column G get deleted as it becomes obsolete, the macro needs to be updated, while the formulas will not require any maintenance as they are automatically updated.
In reference to the macro without the .Formula method
I found this redundant, as it’s like writing an algorithm to do something that can be done efficiently and accurately with an existing function, as such a macro will not bring anything that's it's not there actually.
I'll consider the advantage of writing such a procedure in a situation in which the workbook is very large and it heavily uses resource significantly slowing down the performance of the workbook, however the advantages to be delivered by the procedure will not reside and just writing the formulas but it must calculate the results and enter the values resulting from the formulas instead of the formulas thus making the workbook light, fast and smooth to the end user.

Answer 2

To get the average of them all, just use
=AVERAGE(I2:K7)
As to the VBA, as it is all done on the same lines, could you just use
For i = 2 To 7
Cells(i,"O").Value = Application.Sum(Range(Cells(i,"I"),Cells(i,"K")))
Next i