#### VBA Calculation with Variables 03-25-10

```Hello:  I am trying to calculate an average of numbers in an array for a
series of individuals.  The quantity of numbers may range from none to more
than 20 and I want to average no less than 2 numbers nor more than 8 numbers.
I am using Select Case as I thought that a nested If..Then.. Else would be
cumbersome.  The calculation for 8 numbers works (with the exception of a
rounding issue which will be explained further down), but when I want to
calculate averages for any fewer than 8 numbers it returns erroneous values.
It seems as if it is holding onto additional numbers so the averages are much
higher than they should be.

Following is the basic code:

Dim avg As Single

' calculate average if >=2, <=8 valid numbers
avg = 0

Select Case 8 - 0
Case 8
If holdnumbers(0) > 0 And holdnumbers(1) > 0 And holdnumbers(2)
> 0 And holdnumbers(3) > 0 And holdnumbers(4) > 0 And holdnumbers(5) > 0 And
holdnumbers(6) > 0 And holdnumbers(7) > 0 Then
golfavg = (holdnumbers(0) + holdnumbers(1) + holdnumbers(2)
+ holdnumbers(3) + holdnumbers(4) + holdnumbers(5) + holdnumbers(6) +
holdnumbers(7)) / 8
End If

Case 7
If holdnumbers(0) > 0 And holdnumbers(1) > 0 And holdnumbers(2)
> 0 And holdnumbers(3) > 0 And holdnumbers(4) > 0 And holdnumbers(5) > 0 And
holdnumbers(6) > 0 Then
golfavg = (holdnumbers(0) + holdnumbers(1) + holdnumbers(2)
+ holdnumbers(3) + holdnumbers(4) + holdnumbers(5) + holdnumbers(6)) / 7
End If

and so forth to End Select.

holdnumbers(0-7) is also cleared (set to 0) after every calculation as so:

' reset score array
holdnumbers(0) = 0
holdnumbers(1) = 0
holdnumbers(2) = 0

Also, in calculating the average the result is returned rounded to one
decimal place, though I have the worksheet set to two decimal places.  The
calculated number is set as Single.   For example,  a worksheet average
calculated as 87.69 is returned by the code as 87.50.

```
 0
Utf
3/25/2010 10:30:01 PM
excel.programming 6508 articles. 2 followers.

1 Replies
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```Kind of confusing and overkill. What is the select case using

selectcase.range("a1")
???

--
Don Guillett
Microsoft MVP Excel
SalesAid Software
dguillett@gmail.com
"Hawk" <Hawk@discussions.microsoft.com> wrote in message
news:5C089260-312F-4A77-9D39-EFE509BE5C17@microsoft.com...
> Hello:  I am trying to calculate an average of numbers in an array for a
> series of individuals.  The quantity of numbers may range from none to
> more
> than 20 and I want to average no less than 2 numbers nor more than 8
> numbers.
> I am using Select Case as I thought that a nested If..Then.. Else would be
> cumbersome.  The calculation for 8 numbers works (with the exception of a
> rounding issue which will be explained further down), but when I want to
> calculate averages for any fewer than 8 numbers it returns erroneous
> values.
> It seems as if it is holding onto additional numbers so the averages are
> much
> higher than they should be.
>
> Following is the basic code:
>
>   Dim avg As Single
>
> ' calculate average if >=2, <=8 valid numbers
>        avg = 0
>
>    Select Case 8 - 0
>         Case 8
>            If holdnumbers(0) > 0 And holdnumbers(1) > 0 And holdnumbers(2)
>> 0 And holdnumbers(3) > 0 And holdnumbers(4) > 0 And holdnumbers(5) > 0
>> And
> holdnumbers(6) > 0 And holdnumbers(7) > 0 Then
>                golfavg = (holdnumbers(0) + holdnumbers(1) + holdnumbers(2)
> + holdnumbers(3) + holdnumbers(4) + holdnumbers(5) + holdnumbers(6) +
> holdnumbers(7)) / 8
>            End If
>
>        Case 7
>            If holdnumbers(0) > 0 And holdnumbers(1) > 0 And holdnumbers(2)
>> 0 And holdnumbers(3) > 0 And holdnumbers(4) > 0 And holdnumbers(5) > 0
>> And
> holdnumbers(6) > 0 Then
>                golfavg = (holdnumbers(0) + holdnumbers(1) + holdnumbers(2)
> + holdnumbers(3) + holdnumbers(4) + holdnumbers(5) + holdnumbers(6)) / 7
>            End If
>
> and so forth to End Select.
>
> holdnumbers(0-7) is also cleared (set to 0) after every calculation as so:
>
>    ' reset score array
>        holdnumbers(0) = 0
>        holdnumbers(1) = 0
>        holdnumbers(2) = 0
>
> Also, in calculating the average the result is returned rounded to one
> decimal place, though I have the worksheet set to two decimal places.  The
> calculated number is set as Single.   For example,  a worksheet average
> calculated as 87.69 is returned by the code as 87.50.
>

```
 0
Don
3/25/2010 11:39:50 PM

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