I have a strings in column "C", starting at C2 (for example: Cat, Dog, Bird, etc...) and I don't know how many. So I am using a LRow function to find the last row with data. Currently, the last row is C63 but this is expected to be different if I run the subroutine next week or next month (Hence why I said "I don't know how many"). I want to create an array for example RTArr = Array("Cat", "Dog", "Bird", etc...) So... I was thinking something like:
Dim RTArr As Variant
LRow = r.End(xlDown).Offset(x, y).Row
With ActiveSheet
For i = 2 To LRow
str = .Range("C" & i).Value
Next i
End With
Can I populate the array with something like:
Dim RTArr As Variant
LRow = r.End(xlDown).Offset(x, y).Row
With ActiveSheet
For i = 2 To LRow
ArrNum = (i - 1)
str = .Range("C" & i).Value
RTArr(ArrNum) = str
Next i
End With
Or does this not work because of the unknown size of the array? Or do I have to use "amend" in the loop? Would I be better off using a "collection" in this case? Or going about it some other way? Can I simply set a range of cells as an array without needing to loop?
If you declare a dynamic array at first (without the size), you need to ReDim it to the needed size before populating it, which in your case will be the number of rows e.g. ReDim RTArr(numberofitems). Or use a two dimensional array ReDim RTArr(numbercolumns, numberrows).
Remember that standard arrays begin at element 0, but you can define it however you like.
Remember that when inputting ranges into array Excel creates by default a two-dimensional array
More advanced techniques are possible of course, you can do some more research about VBA arrays regarding those:
1) you could ReDim the array after each element added inside of the loop, but this is mostly useful for one dimensional arrays.
2) you could define a much bigger size of array than needed before populating it, populate it, and then shrink the array to the actual size needed.
3) note that when using two (or more) dimensions ReDim Preserve works only on the last dimension.
Pseudo code for the basic populating:
Dim arr() as Variant
'we know we want to populate array with 10 elements
ReDim arr(1 to 10)
For i = 1 to 10
'This part will insert the count from the loop into the count position in array
' eg. first element of array will be a 1, second a 2 etc. until 10
arr(i) = i
Next i
If your version of Excel supports the TEXTJOIN function:
Sub Kolumn2Array()
Dim r As Range
Dim N As Long
Dim RTArray
Dim comma As String
comma = ","
N = Cells(Rows.Count, "C").End(xlUp).Row
Set r = Range("C2:C" & N)
With Application.WorksheetFunction
RTArray = Split(.TextJoin(comma, True, r), comma)
End With
End Sub
The function below finds the first result.
There could be duplicate rows with matching values that meet my if statements. How would I create an array to store the row numbers the search function found so that I can process the data later.
How would I create the array size based on the number of results found in the for loop?
I am assuming that the for loop counter will have some sort of role to play in this. Let's say the for loop found 2 matches in row numbers 56 and 98 matching my if statements:
array_example(counter, 0) = 56
array_example(counter, 0) = 98
The stored values would be:
array_example(1, 0) = 56
array_example(2, 0) = 98
Private Sub Complex_Search(col1, cval1, col2, cval2)
'MsgBox (col1 & " " & col2)
'MsgBox (cval1 & " " & cval2)
Dim i
Dim lRow
Dim Counter
lRow = Cells(Rows.Count, 1).End(xlUp).row
Counter = 0
With Sheets("Office Spaces")
For i = 2 To lRow
If LCase(.Cells(i, col1).Value) = LCase(cval1) And LCase(.Cells(i, col2).Value) = LCase(cval2) Then
row = i
Counter = Counter + 1
End If
Next i
End With
If row = "" Then
MsgBox ("Search complete. 0 results found")
Else
GetRowData (row)
UserForm1.resmax.Value = 1
End If
End Sub
It's worth noting that you haven't even initialized row, and have just let vba implicitly declare it as a variant type for you. To avoid common problems that arise from typos, include Option Explicit at the top of your code and Dim every variable with the type beside it. For example: Dim i as long. Dim i will work, but it will declare it as a variant type
To initialize an array in VBA you use Dim row() as variant. From there you can re-dimension its size using Redim row(LboundX to UboundX) but this will reset all the stored values to zero. To get around this use Redim Preserve row(LBoundX to UBound X).
If you wish to use a 2D array, add a comma and then put the bounds for the next dimension Redim Preserve row(LBoundX to UBound X, LboundY to UBoundY)
At the top of your code I would include
Dim row() as Variant
Redim Preserve row(1 to 1)
Then within the loop I would change row = i to
row(Ubound(row)) = i
Redim Preserve row(1 to Ubound(row) +1)
Now that you have an array though, the check you do below will no longer work and will likely throw an error because you there's no specified index. Instead I suggest changing it from If row = "" Then to If Counter = 0 Then.
I'm not sure what the intention is with GetRowData(row) but you can just access each row number via row(i). It is worth noting however, that the row array will have Counter +1 number of items, but the last one will be blank. You could get around this by adding in an if statement within the already existing one that would look something like this:
If Counter = 0 Then
row(1) = i
Else
ReDim Preserve row(1 To UBound(row) + 1)
row(UBound(row)) = i
End If
Counter = Counter + 1
By implementing this change, row should have exactly Counter number of items that all have a non-empty value
I don't really suggest making a column array because it becomes more cumbersome to change the array size. Redim preserve or not only allows you to change the last dimension in the array, so to change the number of rows you would have to set the array equal to the transpose of itself, do the redim and then set it to the transpose of itself again. It's just needlessly messy. If you're pasting it to a sheet and need it to be in a column you could just transpose it at the end instead.
I create an array that the random number generator should pull from. The array is on a sheet and the values from a column are included if the column to their left has a value of 1 (1 means playing, 0 means not playing). Everything seems to be working when I test it with 10 numbers indicating playing and 1000+ numbers indicating not playing EXCEPT FOR 0 being included in the array of numbers when the numbers go from 1-1500.
Here is the code:
Sub RandArray()
Dim RandArray As Variant, cell As Range
ReDim RandArray(0)
For Each cell In Worksheets("Registration").Range("B:B").Cells
If cell.Value = "1" Then
RandArray(UBound(RandArray)) = cell.Offset(0, 1).Value
ReDim Preserve RandArray(UBound(RandArray) + 1)
End If
Next cell
ReDim Preserve RandArray(UBound(RandArray))
Range("A27").Value = WorksheetFunction.RandBetween(LBound(RandArray), UBound(RandArray))
End Sub
In VB6 [Re]Dim array(N) define an array with N+1 elements1, 0, 1, ..., N.
ReDim Preserve RandArray(UBound(RandArray) + 1) correctly exploit this fact, growing the array by one element.
ReDim Preserve RandArray(UBound(RandArray)) however is incorrect: let N+1 be the number of elements of RandArray, then UBound(RandArray) is N, the last valid index; so ReDim Preserve RandArray(UBound(RandArray)) is equivalent to ReDim Preserve RandArray(N) which still have N + 1 elements.
To get rid of the spurious last null element, shrink the array with ReDim Preserve RandArray(UBound(RandArray)-1)
1 Assuming no Option Base 1.
If you want a random element of RandArray then:
Range("A27").Value = RandArray(WorksheetFunction.RandBetween(LBound(RandArray), UBound(RandArray)))
(your code just gets a random index)
I would also use:
For Each cell In Intersect(Worksheets("Registration").Range("B:B").Cells,Worksheets("Registration").UsedRange)
To speed things up.
Thanks for reading my question,
I was given a list of about 250k entries along with names and sign in dates to accompany each entry to show when they logged. My task is to find out which users signed in on consecutive days, how often and how many times.
i.e. Bob smith had 3 consecutive days one time, 5 consecutive days 3 times.
joe smith had 8 consecutive days once, 5 consecutive days 8 times
etc
I am brand new to VBA and have been struggling to write a program to do this.
code:
Option Explicit
Option Base 1
Sub CountUUIDLoop()
Dim UUID As String
Dim Day As Date
Dim Instance() As Variant
ReDim Instance(50, 50)
Dim CountUUID As Variant
Dim q As Integer
Dim i As Long
Dim j As Long
Dim f As Integer
Dim g As Integer
Dim LastRow As String
f = 1
q = 1
g = 2
LastRow = Cells.Find("*", [A1], , , xlByRows, xlPrevious).Row
For i = q To LastRow
UUID = Cells(i, "A")
Instance(f, 1) = UUID
g = 2
For j = 1 To LastRow
If UUID = Cells(j, "A") Then
Instance(f, g) = Cells(j, "B")
g = g + 1
End If
Next j
f = f + 1
q = g - 1
Next i
End Sub
The goal of this code is to go through the entries and store them in the array 'Instance' such that the 2D array would look like [UUID1, B1, B2, B3]
[UUID2, B1, B2, B3, B4]
[UUID3, B1, B2]
Where the UUID is the user, the B1 represents the date that user signed in, b2 would be the next date they signed in etc. Some users have more or less dates than others.
My main issue has come with setting up the array as I keep getting different errors around it. I'm not sure how to define this 2D array partly because there will be over 30 000 rows, each with 1->85 columns.
Any help is appreciated, let me know if anything needs further clarification. Once again this is my first time using VBA so im sorry ahead of time if everything i've been doing is wrong.
P.S. I used ReDim Instance (50,50) as a test to see if i could make it work by predefining but same errors occurred. Thanks again!
As far as I understand from your question and code, you have a table with following structure:
..............A.................B
1........LOGIN1.......DATE1
2........LOGIN1.......DATE2
3........LOGIN1.......DATE3
4........LOGIN2.......DATE4
5........LOGIN2.......DATE5
6........LOGIN3.......DATE6
And your task in this code was to fetch data in a 2D structure like this:
RESULT_ARRAY-
............................|-LOGIN1-
............................................|-DATE1
............................................|-DATE2
............................................|-DATE3
............................|-LOGIN2-
............................................|-DATE4
............................................|-DATE5
............................|-LOGIN3-
............................................|-DATE6
First of all, you need to know what goes wrong in your code. Please see comments in code below to find out the reason of error:
Option Explicit
Option Base 1
Sub CountUUIDLoop()
Dim UUID As String
Dim Day As Date
Dim Instance() As Variant ' If you are using variant data type, it is not necesary to point it: default data type in VBA is Variant. Just write like this: "Dim Instance()"
ReDim Instance(50, 50) ' Limitation in 50 may be the reason, why your script is going into "out of range" error.
' Remember, that this operation means, that your array now will have following dimentions: [1..50,1..50]
Dim CountUUID As Variant 'Just write like this: "Dim CountUUID"
Dim q As Integer ' you can describe all your variables in one line, like this: "Dim q as Integer,f as Integer,g as Integer"
Dim i As Long
Dim j As Long
Dim f As Integer
Dim g As Integer
Dim LastRow As String ' first mistake: you are using String data type to perform numeric operations below in your FOR-cycle
f = 1 ' Your Instance array index starts from {0} and you are not using this index by starting from {1}.
q = 1 ' The reason to use this variable is not obvious. You could just use constant in FOR cycle below and avoid unnecessary variables.
g = 2 ' You could remove this line, because this var is set every time in cycle below (before second FOR)
LastRow = Cells.Find("*", [A1], , , xlByRows, xlPrevious).Row ' The alternative here is to use predefined Excel constants, like this:
' "Cells.SpecialCells(xlLastCell).Row".
'If LastRow is bigger, than {50} - this could be a reason of your Error.
For i = q To LastRow ' Here goes comparison between String and Integer data type, not good thing, but type conversion should work fine here.
UUID = Cells(i, "A") ' No need to perform re-set here, just move forward and assign value from this cell to the Instanse directly:
' Like this: Instance(f, 1) = Cells(i, "A")
Instance(f, 1) = UUID
g = 2
For j = 1 To LastRow ' It is another point, why "q" variable is not necessary. :)
If UUID = Cells(j, "A") Then ' You could use your Instansce value instead of UUID there, like this: "Instance(f, 1)"
Instance(f, g) = Cells(j, "B") 'If "g" variable will somehow become bigger, than {49}, this could become a reason of your Error.
g = g + 1
End If
Next j
f = f + 1
q = g - 1 ' "q" variable is not used after this row, so it is a strange unnecessary action
Next i
End Sub
Now, when we have some information about error, let me do some improvements on your code. I am certain, that to make most simply code, you can use your Excel worksheets to store and count data with VBA as background automations. But if you need the code with arrays, let's do this! :)
Option Explicit ' It is an option that turns on check for every used variable to be defined before execution. If this option is not defined, your code below will find undefined variables and define them when they are used. Good practice is to use this option, because it helps you, for example to prevent missprinting errors in variable names.
Option Base 1 ' This option sets the default index value for arrays in your code. If this option is not set, the default index value will be {0}.
Const HEADER_ROW = 1 ' It is a number to identify your header row, next row after this one will be counted as a row with data
Const UUID = 1 ' ID of element in our "Instance" array to store UUID
Const DATES_ID = 2 ' ID of element in our "Instance" array to store dates
Function CountUUIDLoop()
ActiveSheet.Copy After:=ActiveSheet 'Copy your worksheet to new one to ensure that source data will not be affected.
Dim Instance(), dates() ' "Instance" will be used to store all the data, "dates" will be used to store and operate with dates
ReDim Instance(2, 1) ' Set first limitation to the "Instance" array in style [[uuid, dates],id]
ReDim dates(1) ' Set first limitation to the "dates" array
Instance(DATES_ID, 1) = dates
Dim CountUUID
Dim i as Long, j as Long, f as Long, active_element_id As Long 'Integer is quite enough to perform our array manipulations, but Long datatype is recomended (please refer to UPDATE2 below)
i = HEADER_ROW + 1 ' Set first row to fetch data from the table
active_element_id = 1 ' Set first active element number
With ActiveSheet ' Ensure that we are working on active worksheet.
While .Cells(i, 1) <> "" 'If operated cell is not empty - continue search for data
If i > HEADER_ROW + 1 Then
active_element_id = active_element_id + 1 ' increment active element number
ReDim Preserve Instance(2, active_element_id) ' Assign new limitation (+ 1) for our Instances, don't forget to preserve our results.
ReDim dates(1) ' Set first limitation to the "dates" array
Instance(DATES_ID, active_element_id) = dates
End If
Instance(UUID, active_element_id) = .Cells(i, 1) ' save UUID
dates(1) = .Cells(i, 2) ' save first date
j = i + 1 ' Set row to search next date from as next row from current one.
While .Cells(j, 1) <> "" 'If operated cell is not empty - continue search for data
If .Cells(j, 1) = .Cells(i, 1) Then
ReDim Preserve dates(UBound(dates) + 1) ' Expand "dates" array, if new date is found.
dates(UBound(dates)) = .Cells(j, 2) ' Save new date value.
.Cells(j, 1).EntireRow.Delete 'Remove row with found date to exclude double checking in future
Else
j = j + 1 ' If uuid is not found, try next row
End If
Wend
Instance(DATES_ID, active_element_id) = dates
i = i + 1 'After all the dates are found, go to the next uuid
Wend
.Cells(i, 1) = "UUID COUNT" ' This will write you a "UUID COUNT" text in A column below all the rest of UUIDs on active worksheet
.Cells(i, 2) = i - HEADER_ROW - 1 ' This will write you a count of UUIDs in B column below all the rest of UUIDs on active worksheet
End With
CountUUIDLoop = Instance ' This ensures that your function (!) returns an array with all UUIDs and dates inside.
End Function
This function will print you count of your UUIDs at the bottom of active sheet and return you an array like this:
[[LOGIN1][1], [[DATE1][DATE2][DATE3]][1]]
I have used this order of storing data to avoid error with expanding of multidimentional arrays. This error is similar to yours, so you could read more about this there: How can I "ReDim Preserve" a 2D Array in Excel 2007 VBA so that I can add rows, not columns, to the array? Excel VBA - How to Redim a 2D array? ReDim Preserve to a Multi-Dimensional Array in Visual Basic 6
Anyway, you could use my function output ("Instance" array) to perform your further actions to find what you need or even display your uuid-dates values. :)
Good luck in your further VBA actions!
UPDATE
Here is the test procedure showing how to work with the above function's results:
Sub test()
Dim UUIDs ' The result of the "CountUUIDLoop" function will be stored there
Dim i as Long, j As Long ' Simple numeric variables used as indexies to run through our resulting array
UUIDs = CountUUIDLoop ' assign function result to a new variable
Application.DisplayAlerts = False ' Disable alerts from Excel
ActiveSheet.Delete ' Delete TMP worksheet
Application.DisplayAlerts = True ' Enable alerts from Excel
If UUIDs(UUID, 1) <> Empty Then ' This ensures that UUIDs array is not empty
Sheets.Add After:=ActiveSheet ' Add new worksheet after active one to put data into it
With ActiveSheet 'Ensure that we are working with active worksheet
.Cells(HEADER_ROW, 1) = "UUIDs/dates" ' Put the header into the "HEADER_ROW" row
For i = 1 To UBound(UUIDs, 2) ' run through all the UUIDs
.Cells(1 + HEADER_ROW, i) = UUIDs(UUID, i) ' Put UUID under the header
For j = 1 To UBound(UUIDs(DATES_ID, i)) ' run through all the dates per UUID
.Cells(j + 1 + HEADER_ROW, i) = UUIDs(DATES_ID, i)(j) ' put date into column below the UUID
Next j ' Go to next date
Next i ' Go to next UUID
.Cells.EntireColumn.AutoFit ' This will make all columns' width to fit its contents
End With
Else
MsgBox "No UUIDs are found!", vbCritical, "No UUIDs on worksheet" ' Show message box if there are no UUIDs in function result
End If
End Sub
So, if you'll have following data on the active worksheet:
..............A.................B
1........LOGIN1.......DATE1
2........LOGIN1.......DATE2
3........LOGIN1.......DATE3
4........LOGIN2.......DATE4
5........LOGIN2.......DATE5
6........LOGIN3.......DATE6
...this sub will put UUIDs on the new sheet like this:
..............A.................B.................C
1........UUIDs/dates
2........LOGIN1........LOGIN2........LOGIN3
3........DATE1.........DATE4.........DATE6
4........DATE2.........DATE5
5........DATE3
UPDATE2
It is recomended to use Long data type instead of Integer each type when integer (or whole number) variable is needed. Long is slightly faster, it has much wider limitations and costs no additional memory. Here is proof link:
MSDN:The Integer, Long, and Byte Data Types
I would recommend using collections and a dictionary instead of arrays. The below code will structure the data in a way that is very similar to the way you wanted it.
Sub collect_logins_by_user_()
'you need to enable the microsoft scripting runtime
'in tools - references
'assuming unique ids are in col A and there are no gaps
'and assuming dates in col B and there are no gaps
'
'The expected runtime for this is O(n) and I have used similar code on more than 250.000 record.
'It still takes a while obviously, but should run just fine.
'
'The the data will bestructed in the following format:
'{id_1: [d_1, d_2,...], id_2: [d_3, d_4,...], ...}
Dim current_id As Range: Set current_id = ActiveSheet.Range("A2") 'modify range as required
Dim logins_by_users As New Dictionary
While Not IsEmpty(current_id)
If Not logins_by_users.Exists(current_id.Value) Then
Set logins_by_users(current_id.Value) = New Collection
End If
logins_by_users(current_id.Value).Add current_id.Offset(ColumnOffset:=1).Value
Set current_id = current_id.Offset(RowOffset:=1)
Wend
'Once you have the data structured, you can do whatever you want with it.
'like printing it to the immediate window.
Dim id_ As Variant
For Each id_ In logins_by_users
Debug.Print "======================================================="
Debug.Print id_
Dim d As Variant
For Each d In logins_by_users(id_)
Debug.Print d
Next d
Next id_
Debug.Print "======================================================="
End Sub
I have written a bit of code that does something along the lines of what you are trying to do - it prints to the debug window the different numbers of consecutive logs per user, separeted by commas.
This code makes use of the dictionary object - which essentially is an associative array where the indexes are not restrained to numbers like they are in arrays, and offers a couple of convenient features to manipulate data that arrays don't.
I have tested this on a sheet including user ids in colomn A and log dates in column B - including headers - and this looks to work fine. Fell free to give it a try
Sub mysub()
Dim dic As Object
Dim logs As Variant
Dim myval As Long
Dim mykey As Variant
Dim nb As Long
Dim i As Long
Set dic = CreateObject("Scripting.dictionary")
'CHANGE TO YOUR SHEET REFERENCE HERE
For Each cell In Range(Cells(2, 1), Cells(Worksheets("Sheet8").Rows.count, 1).End(xlUp))
mykey = cell.Value
myval = cell.Offset(0, 1)
If myval <> 0 Then
On Error GoTo ERREUR
dic.Add mykey, myval
On Error GoTo 0
End If
Next cell
For Each Key In dic
logs = Split(dic(Key), ",")
logs = sortArray(logs)
i = LBound(logs) + 1
nb = 1
Do While i <= UBound(logs)
Do While CLng(logs(i)) = CLng(logs(i - 1)) + 1
nb = nb + 1
i = i + 1
Loop
If nb > 1 Then
tot = tot & "," & CStr(nb)
nb = 1
End If
i = i + 1
Loop
If tot <> "" Then dic(Key) = Right(tot, Len(tot) - 1)
Debug.Print "User: " & Key & " - Consecutive logs: " & dic(Key)
tot = ""
mys = ""
Next Key
Exit Sub
ERREUR:
If myval <> 0 Then dic(mykey) = dic(mykey) & "," & CStr(myval)
Resume Next
End Sub
Function sortArray(a As Variant) As Variant
For i = LBound(a) + 1 To UBound(a)
j = i
Do While a(j) < a(j - 1)
temp = a(j - 1)
a(j - 1) = a(j)
a(j) = temp
j = j - 1
If j = 0 Then Exit Do
Loop
Next i
sortArray = a
End Function
I am trying to copy a range of cells from a range of rows from two workbooks. This information is used to do a comparison of the contents of both workbooks rows by ID.
The first solution I tried involved cell by cell "binary" comparison. This works for worksheets with few rows:
For i = 2 To LastSheetRow
Set FoundCell = Workbooks(WorkbookA).Sheets(SheetNameFromArray).Range("A:A").Find(What:=Workbooks(WorkbookB).Sheets(SheetNameFromArray).Cells(i, 1).Value)
If Not FoundCell Is Nothing Then
aCellValues(0) = 1
Workbooks(UserWorkbook).Sheets(SheetNameFromArray).Cells(i, LastSheetColumn + 1).Value = FoundCell.Row
For j = 2 To LastSheetColumn
Select Case Workbooks(WorkbookB).Sheets(SheetNameFromArray).Cells(i, j).Value
Case Is = Workbooks(WorkbookA).Sheets(SheetNameFromArray).Cells(FoundCell.Row, j).Value
aCellValues(j - 1) = 1
Case Else
aCellValues(j - 1) = 0
End Select
Next j
Else
End If
Next i
I would like to store the contents of one row of each of the two workbooks on one array to do the comparison, as I believe it's a faster solution.
After defining the range to do the comparison I encountered the following error when copying the cells into an array:
Subindex out of interval (Error 9)
This generates the error:
Dim aWorkbookBInfo() As Variant, aWorkbookAInfo() As Variant, rngWorkbookBToCompare As Range, rngWorkbookAToCompare As Range
Dim SumToCheck As Integer, FoundCell As Range, aCellValues() As Integer
ReDim aCellValues(LastSheetColumn - 1)
ReDim aWorkbookBInfo(LastSheetColumn - 1)
ReDim aWorkbookAInfo(LastSheetColumn - 1)
For i = 2 To LastSheetRow
Set FoundCell = Workbooks(WorkbookA).Sheets(SheetNameFromArray).Range("A:A").Find(What:=Workbooks(WorkbookB).Sheets(SheetNameFromArray).Cells(i, 1).Value)
If Not FoundCell Is Nothing Then
aCellValues(0) = 1
Workbooks(WorkbookB).Sheets(SheetNameFromArray).Cells(i, LastSheetColumn + 1).Value = FoundCell.Row
With Workbooks(WorkbookB).Sheets(SheetNameFromArray)
Set rngWorkbookBToCompare = Range(Cells(i, 2), Cells(i, LastSheetColumn))
End With
With Workbooks(WorkbookA).Sheets(SheetNameFromArray)
Set rngWorkbookAToCompare = Range(Cells(FoundCell.Row, 2), Cells(FoundCell.Row, LastSheetColumn))
End With
aWorkbookBInfo = rngWorkbookBToCompare
aWorkbookAInfo = rngWorkbookAToCompare
For j = 1 To LastSheetColumn - 1
If aWorkbookBInfo(j).Value = aWorkbookAInfo(j).Value Then
aCellValues(j) = 1
Else
aCellValues(j) = 0
End If
Next j
Else
End If
Next i
Complete Revision:
The range array assignment produces a two-dimensional array in these lines:
aWorkbookBInfo = rngWorkbookBToCompare
aWorkbookAInfo = rngWorkbookAToCompare
This happens regardless of how you defined and dimensioned them at the beginning of your code. Since they are a two-dimensional array, they must be addressed as aWorkbookBInfo(a, b) where a is a row and b is a column.
Unlike Ranges, where it is okay to reference the first cell in any range, you must fully address an array before attempting to reference the array item. So, while rngWorkbookBToCompare(j).Value works, aWorkbookBInfo(j).Value does not. Furthermore, Value is not necessarily a property of whatever object Excel puts in the array. If you want the first cell of column j, try adding the row and leaving off the reference to the Value property as in: aWorkbookBInfo(1, j).