Excel vba - joining two arrays - excel

Question

I need to join two arrays vd and vd1 into vdu.
ReDim vdu(1 To (UBound(vd, 1) + UBound(vd1, 1)), 1 To 1)
For i = 1 To UBound(vd, 1)
vdu(i, 1) = vd(i, 1)
Next i
For j = i To UBound(vdu, 1)
vdu(j, 1) = vd1(j - i + 1, 1)
Next j
First, I get and "out of range" error.
Second, in the end I will have 18 arrays that I'll need to join, so I don't know if this is the best idea for joining them.

Answer 1

try with
ReDim vdu(LBound(vd) To UBound(vd) + UBound(vd1), 1 To 1)
For i = LBound(vdu) To UBound(vdu)
If i <= UBound(vd) Then
vdu(i, 1) = vd(i, 1)
Else
vdu(i, 1) = vd1(i - UBound(vd), 1)
End If
Next i
Update for second part of question
I'd convert your merge code into a function
Public Function MergeArrays(arr1 As Variant, arr2 As Variant) As Variant
Dim i As Long
Dim arr As Variant
ReDim arr(LBound(arr1, 1) To UBound(arr1, 1) + UBound(arr2, 1), 1 To 1)
For i = LBound(arr, 1) To UBound(arr, 1)
If i <= UBound(arr1, 1) Then
arr(i, 1) = arr1(i, 1)
Else
arr(i, 1) = arr2(i - UBound(arr1, 1), 1)
End If
Next i
MergeArrays = arr
End Function
And then pass each array to it 1 at a time e.g.
arr = MergeArrays(vd1, vd2)
arr = MergeArrays(arr, vd3)
arr = MergeArrays(arr, vdx)
You could loop through this by storing your arrays in an array or dictionary and looping through that instead as well
Other option
Public Function MergeArrays(ParamArray arrays() As Variant) As Variant
Dim i As Long, j As Long, cnter As Long, UBoundArr As Long, OldUBoundArray As Long
Dim arr() As Variant
For j = LBound(arrays) To UBound(arrays)
UBoundArr = UBoundArr + UBound(arrays(j), 1)
Next j
ReDim arr(1 To UBoundArr, 1 To 1)
For j = LBound(arrays) To UBound(arrays)
For i = LBound(arrays(j)) To UBound(arrays(j))
arr(i + OldUBoundArray, 1) = arrays(j)(i, 1)
Next i
OldUBoundArray = OldUBoundArray + UBound(arrays(j), 1)
Next j
MergeArrays = arr
End Function
This method uses a ParamArray. If you're not sure what that is look it up but effectively you're able to pass an unspecified amount of arguments to the function. Therefore with this function you can combine any amount of arrays (of the same shape and same base i.e. x to x, 1 to 1) and it will combine them. Call like
arr = MergeArrays(vd, vd1, vd2,....,vd18)

Answer 2

getMasterArray will return an array that combines up to 60 different 2d arrays into one. getMasterArray also give you the option of returning a 0 or based array.
Sub TestgetMasterArray()
Dim data
data = getMasterArray(False, Range("List1").Value, Range("List2").Value, Range("List3").Value, Range("List4").Value)
Worksheets("Result").Range("A1").Resize(UBound(data), UBound(data, 2)).Value = data
End Sub
Function getMasterArray(Base0 As Boolean, ParamArray Arrays() As Variant)
Dim result As Variant, v As Variant
Dim Count As Long, Count2 As Long, lowBound As Integer, lOffset As Integer, x As Long, x1 As Long, y As Long
For Each v In Arrays
Count = Count + UBound(v) + IIf(LBound(v) = 0, 1, 0)
y = UBound(v, 2) + IIf(LBound(v, 2) = 0, 1, 0)
If y > Count2 Then Count2 = y
Next
lowBound = IIf(Base0, 0, 1)
ReDim result(lowBound To Count, lowBound To Count2)
For Each v In Arrays
If LBound(v, 2) > LBound(result, 2) Then
lOffset = -1
ElseIf LBound(v, 2) < LBound(result, 2) Then
lOffset = 1
End If
For x = LBound(v) To UBound(v)
For y = LBound(v, 2) To UBound(v, 2)
result(lowBound, y + lOffset) = v(x, y)
Next
lowBound = lowBound + 1
Next
Next
getMasterArray = result
End Function
Sample data generated by ockaroo.com