How to add up two-dimensional arrays? - vba

Question

My code runs trough dozens of excel documents, selects range and gives the range to an array. I would like to add up the arrays to get a summarized data then paste the result to an existing worksheet.
The formula should be something like this:
rangeVar = oNewBook.Worksheets(1).Range("A1:D4").Value
sumRange = sumRange + rangeVar
Important! Some cells in the range is empty (I don't know is this matters). Also I would like to add up the values separately like sumRange(1,1)+rangeVar(1,1) ; sumRange(2,2)+rangeVar(2,2) , etc... How to do this?
You can check the code here:
Sub LoopAllExcelFilesInFolder()
Dim OutputWs As Worksheet
Dim oNewBook As Workbook
Dim myPath As String
Dim myFile As String
Dim myExtension As String
Dim FldrPicker As FileDialog
Dim Lastrow As Long
Dim i As Integer, j As Integer
Dim summaryVar() As Variant
Dim rangeVar() As Variant
'Optimize Macro Speed
Application.ScreenUpdating = False
Application.EnableEvents = False
Application.Calculation = xlCalculationManual
'Retrieve Target Folder Path From User
Set FldrPicker = Application.FileDialog(msoFileDialogFolderPicker)
With FldrPicker
.Title = "Select A Target Folder"
.AllowMultiSelect = False
If .Show <> -1 Then GoTo NextCode
myPath = .SelectedItems(1) & "\"
End With
'In Case of Cancel
NextCode:
myPath = myPath
If myPath = "" Then GoTo ResetSettings
'Target File Extension
myExtension = "*.xlsx"
'Target Path with Ending Extention
myFile = Dir(myPath & myExtension)
'set output worksheet
Set OutputWs = ThisWorkbook.Worksheets("Teszt")
'Loop through each Excel file in folder
Do While myFile <> ""
Set oNewBook = Workbooks.Open(myPath & myFile)
rangeVar = oNewBook.Worksheets(1).Range("A1:D4").Value
oNewBook.Close
'Copy selected items
With OutputWs
Lastrow = .Cells(.Rows.Count, 1).End(xlUp).Offset(1, 0).Row
OutputWs.Range("A" & Lastrow & ":" & "D" & Lastrow) = Application.WorksheetFunction.Sum(rangeVar) 'summaryVar
Paste:=xlPasteAll, operation:=xlPasteSpecialOperationAdd, skipBlanks:=False
Application.CutCopyMode = False
End With
'Get next file name
myFile = Dir
Loop
'Message Box when tasks are completed
MsgBox "Task Complete!"
ResetSettings:
'Reset Macro Optimization Settings
Application.EnableEvents = True
Application.Calculation = xlCalculationAutomatic
Application.ScreenUpdating = True
End Sub

Answer 1

S. Meaden answers this question wonderfully in How to add arrays?. Instead of trying to add the two arrays together, he makes use of Excel's pasteSpecial Addvalues function to add the original range's values to another range. Based on his code, something like the below should work.
Set tempWS = Sheets.Add
Do While myFile <> ""
Set oNewBook = Workbooks.Open(myPath & myFile)
oNewBook.Worksheets(1).Range("A1:D4").Copy
tempWS.Range("A1:D4").PasteSpecial Paste:=xlPasteAll, operation:=xlPasteSpecialOperationAdd
oNewBook.Close

Answer 2

Standard Excel Worksheet Functions will work on 1 and 2 dimensional arras.
Sub Test()
Dim array2(25, 25) As Double
Dim i As Integer, j As Integer
For i = 0 To UBound(array2, 1)
For j = 0 To UBound(array2, 1)
array2(i, j) = Int((Rnd * 100) + 1)
Next
Next
MsgBox WorksheetFunction.Sum(array2)
End Sub