Making Selected Range into an Array and doing stuff with it - vba

Question

I'm trying to teach myself VBA writing some little things. I'm trying to make something that allows you to select some data and then calculates the mean and variance. My code is as follows :
Sub VarianceCalculator()
Dim k As Integer
Dim SelectedData As Range
Dim SelectedDataArray() As Variant
Dim Var As Double
Dim Mu As Double
On Error Resume Next
Set SelectedData = Application.InputBox("Select a range of data to be
calculated", Default:=Selection.Address, Type:=8)
On Error GoTo 0
SelectedDataArray = Range(SelectedData.Address)
k = UBound(SelectedDataArray)
Call VarianceCalculatorWithArray(SelectedDataArray, k)
MsgBox ("The selected data has variance " & Var & " and has mean " & Mu)
End Sub
Sub VarianceCalculatorWithArray(Data() As Variant, k As Integer)
Dim Var As Double
Dim Mu As Double
Dim j As Integer
Dim i As Integer
ReDim Data(k) As Variant
Mu = 0
Var = 0
For j = 0 To k
Mu = Mu + (Data(j)) / (k + 1)
Next j
For i = 0 To k
Var = Var + ((Data(i) - Mu) ^ (2)) / (k + 1)
Next i
End Sub
I think the error is that somehow the data is not getting transferred into the array but I can't find a solution to this.
Thanks!!

Answer 1

There are two major problems:
(1) If you want to pass the variables Var and Mu from one procedure to another you'll have to declare them as public variables before the first procedure. The alternative is to setup VarianceCalculatorWithArray as a function.
(2) The array Data() is 2D as a range consists of rows and columns. So, if you want to use an element from this array, you'll have to address it as Data(1, 1). Also note, that this range array starts with row 1 and column 1. Therefore your for...next statements should start with 1 and not with 0.
Note, that you can always set a breakpoint in order to check if data is transferred into the array.